Mercedes engine noise on cold start


I haven't changed the oil myself yet, but will use Castrol Edge as mentioned earlier. 15 Rattle/knocking noise from camshaft adjuster at engine start. Symptom: Car cranks and seems to start normally but turns off immediately, seemingly in the process of going to idle speed (no hesitation noted). Certainly your other possible causes are possible as well. Do this. I've recently acquired a 98 coupé which had the engine replaced about 600km ago. Get a helper. This bulletin provides information related to some 2011-2013MY Sorento (XMa) vehicles, equipped with the 3. It had blown out 5 of the 7. Friend?s car (75k miles) is suffering an intermittent fault. Ford’S Cold EnginE Start-Up t iCKing noiSE Ford advised that the following vehicles equipped with a 3. If the anti-drain back valve in the oil filter leaks, the noise will occur for The car has now covered 135,000 kilometres, mainly on the open road and not for urban stop/start driving. it does happen randomly (warm or cold engine), not all the time.


No oil consumption. Like today, I made several small trips today and never heard a noise, but at 7 am, when it's 32 degrees thats when I hear the noise. It's also a tapping noise. When the engine warms up, the steel expands and the sound goes away. It sounds like you have air in your power steering system. 2015-148 . Use a block heater. Some engines during this build period may have been built with incorrect piston wrist pins. 15 08 16 2010294/5 November 21, 2008. This is the problem with the cold start valve is not opened when it needed. On start up, there is a high pitched winding noise for about 30 seconds and then the winding sound startes coming back down as if it was a turbo. Open the hood when the engine is cold.


A functioning Mercedes Cold Start Valve will increase the vehicles overall dependability in cold parts of the year. Some noise can come from a worn camshaft. It should always come on at cold start. Dear Car Talk: I have a 2016 Ford Escape 1. It only occurs on Cold start ups, like over night or when the car hasn't been driven in a few hours. If the knock is still there, try another cylinder at the next cold start. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. Vehicle 2012 Mercedes-Benz M-Class ML350 4MATIC 4dr SUV AWD (3. 8 quarts all over the engine. Reduces Engine Noise & Noisy Diesel Fuel Injectors. How to fix the clicking noise and start your engine. It sounds like a fan belt or an alternator bearing noise, but the dealer says it isn't.


A warm start is when the engine has been ran shut When it comes to cars, the unexpected is usually bad and changes in state are almost always for the worse. That said, she has nearly 100K miles on her car. The sound you hear is likely the belt squealing as that's pulled around regardless of is frozen. The EPA oil has been ruining timing chains for 25 years. I placed a new O Ring and new oil and now every time Hi All, recently bought a CLK230k 2001 had her checked over by an auto box specialist 3 days ago was found to be low on fluid was topped up 2/3 pints and suspected leak in usual place. all the newer vehicles with the 272/273 engine have this issue, i have an 09 ML350 and at cold start or after it has been sitting for a few hrs after driving the engine knocks for 2-3 seconds. Some people are having there my2012/13mercedes E350 engine rebuilt (connecting rods, pistons, wrist pins), my engine is the new direct injection. Kerosene can be mixed with summer diesel fuel to improve fluidity, as mentioned in the owners manual. EML sometimes illuminates. The wrist pins will cause an audible knocking noise upon start up. Some noises will be heard during start-up in cold engines. The timing chain stretches and you hear a metallic clatter on a cold start.


Car turns over, but it won’t start. some people are having there my2012/13mercedes e350 engine rebuilt (connecting rods, pistons, wrist pins), my engine is the new direct injection. 2-litre AMG V8 engine. I suddenly started experiencing a "cheep, cheep, cheep, cheep" noise from the front of the engine. Only noticeable when the motor and engine oil are cold. The following are some of the more common sounds made by a worn engine at start up. The drag created by using this could no longer be allowing your starter to tutor rapid sufficient to start the engine. My turbo has done it since early days and became more noticeable after I chipped the motor. Turned out it still made the awful noise after a cold start but I didn't have a chance to take it in since I have class everyday and Component: 061000 engine and engine cooling:engine Summary: Xentry: mercedes benz: vehicle stumbles and bucks for a few minutes after a cold start when outside temperature is low (no dtcs). The noise gone again and then now after a week the chirping noise is back again! But only when I start up the engine and eventually will go away. Q: Basically every time after a cold start when I crank the car it makes a clicking noise but it goes away after it idles down and warm up I was thinking that maybe I need a valve adjustment but I'm not sure Mercedes has a cold start valve to spray extra fuel to assist the ignition when the temperature is cold. It's also possible that the belt tensioner pulley is tired.


of running or Thanks for asking us a question on our article “Why Is My Car Making a Whining Noise?”! I’m sorry you are having trouble with your power steering system, but hopefully it will be an easy fix. Mercedes-Benz C-Class and C-Class AMG: Why is My Engine Knocking? What could be causing your engine to knock? Aren't all Mercedes supposed to be smooth and quiet? Unwanted sounds are a pest, especially scary and evil engine related ones. Details below. Engine misfire can also be a contributor to rough idle under cold start conditions. This is found on both new and used models and could also be accompanied by a rough running engine. To see how frequently 2012 Mercedes-Benz C-Class problems occur, check out our car reliability stats. Mercedes-Benz SL-Class R129 (1990-2002) Technical Articles SL300 - SL320 - SL500 - SL600: Welcome to our Mercedes-Benz R129 Technical Articles section. Some owners claim that it is very loud, some say that it is quieter, but it always begins shortly after the car is started if the car is started cold. This is not unique to Mercedes and Diesel engines. When the engine is cold (less than ~50C or so), it acts weird. I personally haven't experienced it nor have we had any customers here inform us about it. Key will not turn the ignition.


mercedes forum at Car Dealer Forums; When starting car first time in the morning. 1- A sticky, slow-closing valve where a space appears and closing the space causes the tap tap tap on engine rotation as the valve is pushed open. 3-liter V8 engine and 93,000 miles on it, makes a rapping noise just after a cold start. Hello Guys. But with the time, this noise becomes louder and occurs even when the engine is hot (much lower). 2013 E350 front left engine noise 2013 E350 front left engine noise Every time I start the car and begin moving forward, within the first 5-10 seconds the car makes a grinding/clicking noise from the front driver's side and you also feel some kind of notchy rattling in the foot area underneath the dash. The sound of the engine may change during this time. Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000♦km (12,000-15,000♦mi) of use. Neither the turbo noise or the alternator noise is of concern. Have the helper start the engine while you listen to the noise. been there for a couple of months, took it to Mercedes dealers who could not put there finger on it Saturday 14th of March 2015 Before starting the engine, remove one spark plug wire and short it to the engine block. Average repair cost is $3,730 at 48,150 miles.


If the rough idle occurs only under cold start conditions Download Engine Knock on Cold Start 2002 Cadillac Escalade – Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. 1981-1985 Mercedes Benz W126 SEL EURO Import Cold Start Injector Valve 280170403 See more like this. Have a chum crank the engine over and carefully look for between the above products no longer turning. Mercedes C180 2002 year A screech sound is heard when the engine is turned on in the morning only. The noise was heard best from the area of the high pressure fuel pump. It pumps extra air into the exhaust stream since on cold startup the engine runs very rich. Brand New. Now you get to replace a $4,000 timing chain. If mine does start doing it or if we get a local complaint we are going to try our best to get to the bottom of it and find a fix. 5 Sounds that Signal your Car Needs Auto Repairs. Brought to idle a few miles after a cold start it misfires badly. If you turn the engine off before the 30 seconds is up the high pitched winding noise continues to come back down even after the engine is turned off.


The dealer said it was the injectors. Whenever the oil pressure is off, the engine may start ticking because there is play between the valvetrain and the lifters. Rod knock or a spun rod bering(s) will be there all the time no matter what the engine temperature. There's a chance that cold oil at startup can help with the lifters, but the oil gradually starts to thin out as the engine starts to warm up. a weird noise after starting the engine but it would go away when I got on the freeway. When started (with the engine cold), I hear a noise coming from the back center of the engine near the firewall that lasts for 15 to 20 seconds. High pitched squeal noise on cold start Index; is a cold start is when its sat over night or the engine is cold. My Mate VINCE 719,505 views The noise is your secondary air injection pump. Common problems (dirty starts) are long cranking times when the engine is cold, start and stop when the engine is hot, or rough idle immediately after the engine starts. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30♦seconds (may last longer in extreme cold temperatures). The Common Problem: Engine Noises When an unfamiliar noise starts coming from somewhere under the hood, people get scared. The engine has a ticking/knocking noise on start up.


cold start, first second no noise next 1 - 2 seconds, loud rattling noise then no noise and engine performance is ok. When the new engine came in, it got the number of the old engine, basically your data card engine number stamped in by the authorized MB shop. 1997 Mercdes E-320 battery drains; Headlights turn on in unattended car. OVERVIEW: This bulletin involves evaluating the engine for cold start knocking noise typically after an overnight cold soak. Typically the engine is cold. sounds like low oil rattle, goes away very quickly as engine warms up. It talks about an engine knock that dissappears after the engine is fully warmed up. The old & blown engine went back to Mercedes and was then rebuilt too, got a new "DAIMLER BENZ ORIGINAL AUSTAUSCH MOTOR" label but no number until it was then sold ("exchanged") again. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some cylinder head work done. Learn about this problem, why it occurs, and how to fix it. if it is carbon build up, what do you suggest, or is rocker noise a common problem and needs to be looked at. Average repair cost is $4,730 at 55,700 miles.


My engine makes so much noise with a cold start that I keep the garage door closed so my neighbours aren’t disturbed. The lawsuit claims the defect leads to premature engine wear Ticking noise on cold start after sitting more than 6 hours. Mercedes originally recommended a block heater for starting in temperatures below 0F. Engine Dies Right After It Starts. Since the noise got louder with increased engine speed, the cause was attributed to the timing chain system. If you have a friend start the car while you listen under the hood (don't wear loose clothing or jewelry, of course), you might be able to localize the squeal on cold start. ” Sure enough, the engine quietens down to normal. it only happens if I start the car after the car has not been running for many hours. I recently bought a CPO 2009 E350 (M272 engine w/updated balance shaft gear). . My problem is that, when the car is started from cold, the engine makes a sound reminiscent of noisy tappets. Vehicle cold start vibration noise problem that dissapears after 15 mins Infact it lasts only for the first 10-15 minutes, after that the car's noise and vibration seems to go back to normal.


reliable luck! I have a weird problem with the engine of my W123 (the engine is gasoline, 2L, 80kW with a Stromberg 175CDT carb). Whats going on here? which eliminates the noise. Rough Idle. If the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine temperature sensor. Should I be concerned about this issue? Link to video. It sounds like rocker arms out of adjustment, could this just be carbon build up. Other heavier knocks will announce themselves under acceleration and heavy load. When they start to leak, it sounds like a ticking sound. High pitch winding noise on cold start up. SUBJECT: CHATTER/RATTLE NOISE FROM ENGINE AFTER COLD SOAK. The noise is a common problem, with Mercedes Benz E-Class, S-Class, C-Class and ML-Class and it is most noticeable when you first start up the car. Their noise is of a lower pitch than a turbo whine so maybe that might help to identify.


auto. In order for an engine to start and run cold, it requires more fuel than when it is hot. The knock noise is most often noticed during initial start- up and typically disappears within the first 5-30 seconds (may last longer in extreme cold will not give the engine that amount of time for warm-up. When the engine is started, that cylinder has less pressure pushing the piston sideways. 2014-140 . it takes between 6 and 10 attempts Running Problems. if i start my car, there is a 3-4 seconds of knocking sound. The frequency of the noise increased with the engine’s RPM. If the noise is a steady metallic rap, it may indicate a rod/rod bearing. Unless you have a diesel, your car's engine should run quietly. ’ These drivers report a loud metal on metal sound when they first start their engines, and is often described as a metallic grinding. *js Bulletin Number: 10-P-053439 Bulletin Date: 03-26-2012 “on cold start, there is gip gip sound on first 5 minutes.


During this period the headlights shine a bit dimmer as well. When cold makes a knocking noise. Acura TSX Loud Rattle Type Noise from Engine After Cold Start - 92 reports. The engine will usually start quiet, then make a ticking noise after a few seconds that lasts about 3 – 15 seconds and then go away for the rest of the day. I'm told by the dealer that this is a normal function for the SS version that lasts until the recenlty purchased 2007 Mercedes E350 with 25,000 makes noise when fist started up cold. later that day my mechanic confirmed trans leak due to be sorted this week. A common complaint from Mercedes-Benz C218 owners is a phenomenon called ‘cold engine start up noise. this extra air is used by the catalyst in order to clean the exhaust. It can sit for days and has no valve train clatter at cold start-up. It does happen randomly (warm or cold engine), not all the time. 2- The coolant temperature sensor is bad. Mileage 57K changed oil twice in last 8000 miles (Mobile 1 5W40 formula M) OBD II scan shows no codes.


technique used to optimize the cold start noise behavior of modern Diesel engines. I have seen references to I'm getting a noise when I fisrt start up the engine. How to RESET the Service Indicator Light on a 2012 Mercedes Benz C Class W204 (and other models) - Duration: 6:12. My car is only 20k miles, 2 years, and Nissan is rebuilding the engine. If the secondary chain tension unloads at the beginning of cranking the noise will be worse. Mercedes C63 AMG vs Maserati Granturismo S Sounds Engine Cold Start and REVS. As the engine heats up the materials (metal plastic and gaskets) all can expand due to the heat and any potential intake leak is closed. A failing battery or starter will need to be identified and replaced. The time of start up is when there is the best chance of strange noises occurring. 2- A tap occurs when the wear adjuster for one of the valves has sludge blocking oil to it. When the engine is started cold, the engine temperature sensor sends a signal to the DME control unit to provide a richer mixture. 07 Mercedes E320 Bluetec "Malfunction Electrical Consumers Switched Off" Power windows, seat and outside mirror Sounds like piston slap, it's about the only 'knocking' noise that completely goes away when warmed up.


There is a light speed-dependent tap on a cold start which can last for 10-20 mins, and then stops abruptly; much more noticeable at tickover. Any idea why this happens and the solutions? parthtrivedi69@yahoo. Cold-start knock isn't normal, but it's common Q My 2002 Chevy Tahoe, with the 5. ABS, ECUs, Power Steering, Throttle Bodies, Sat Nav and I. not with gas at $2. Quiet at 1,000+ rpm. If the knock changes, or is gone, then that is the cylinder with the problem. If the oil had approximately 1500ppm of zinc (ZDDP) the chain would have lasted the life of the engine. Is that correct? If so, does this help rule out the IMS bearing as a source of the noise? Again, I'll remind you that the noise ONLY occurs the first time I start the car COLD each day and will not happen again for about a These parts are lubricated by pressurized motor oil provided by the oil pump which is located inside the lower part of the engine inside the oil pan. Sometimes clicking and clacking sounds will be constant and rise with engine rpm. If the oil is too thin, it's unable to work the lifters. 4 Reasons Your Car Won’t Start When it Gets Really Cold Car Not Turning Over on Cold Mornings in Wisconsin? One of the most common questions asked in the automotive world is: “Why won’t my car start on cold mornings?” It happens to everyone who isn’t fortunate enough to have indoor parking over the winter.


When there is not enough power to the starter or the starter has too much resistance the solenoid tries to activate, but can’t and it makes the distinct “clicking” noise. What Goes Wrong? Trying to start a diesel engine in cold weather with summer diesel fuel in it will require a fuel additive, however. 5L or 3. BTW: My 1991 300CE (M104 engine) runs absolutely silent with exception of slight valve noise on the exhaust side of the head. A common complaint, especially when temperature start to drop is, “My car runs poorly cold, or my car is hard to start cold”. This is normal. most starts for about a second. 6-liter EcoBoost. Change the oil and Mercedes C200 2003 - Misfire problems. This article applies to the Mercedes-Benz E-Class and E-Class AMG (2002-2009). it has been narrowed down on 07-09 vehicles to the cam adjusters, or oil starvation to the heads, on the new 2010 e class vehicles the main bearings in the engine have been the cause to an extremely loud The 2012 Mercedes-Benz C250 has 2 problems reported for engine rattle on cold start. The sound can be best described as a wooden rattling or clicking.


I called my service manager (I was away on holiday), he said to squirt some water on the belt while it was A vehicle's Mercedes Cold Start Valve has a similar function as your engine's standard fuel injectors, spraying fuel into the fuel-air mixture. Recently when I started my car in the morning. Quite normal. I check mine at least every summer for ovbious fluid leaks on the back, and turn the fan by hand to insure there is slight friction in the clutch and that it is smooth without wobbles. I never accelerate heavy or even come close to flooring it. What's That Ticking Sound Coming From Your Car's Engine? Even more strange: The engine is muffled when its cold but noisy when its warm. Step 1: Verify that battery is fully charged screech sound comes when i start the engine in the morning for 30 seconds 9 Answers. The noise seems to be coming from the left side as you look at the engine compartment. mercedessource Tech help - Summary list of the most common causes and parts needed to fix them The common problem is listed and the reference word or words for the part to fix it are listed as a solution. Chances are that if you fix the misfire; you’ll also repair the rough idle at cold start. Initially, the engine’s combustion noise 2012 Mercedes-Benz C-Class Engine Problems. For the first 10 minutes when the car is starting up, all I know is when I put my hand to the wheel it feels like the same vibration levels I get from a Just started over the past week and only when the engine is stone cold, I get a grinding like noise for as little as 5 and up to 10 secs.


The most common "cold start" issue that comes to mind is an intake leak. There are 2 places in the motor that cause the tap. After buying a 2012 Nissan Maxima ,I started hearing a tapping/clanking type noise that only was heard at a cold startup and at a idle that would go away once I was driving ,but as soon as I would park it and start it back up ,again the tapping/clinging noise was noticeable ,but as before only @ a idle or upon starting it up to let the engine Most engine noises have specific tones and rhythms associated with individual parts. engine runs rough in a warm up phase. Geert To determine if the clicking noise is due to a lifter problem or the oil pick ups being clogged, you simply drain some engine oil, fill the equivalent with diesel oil or engine oil cleaner, let the engine run at idle for 20 minutes (better let the engine warm up before you start this procedure, this is more effective). Dear Doctor: I purchased a 2007 Chevy TrailBlazer SS. Then have the helper rev the engine quickly. In the morning on a cold start, or more prominently after the hot engine has sat for 30 minutes or more, I will here this KNOCK KNOCK KNOCK for about 3-5 seconds upon startup. You might want to turn down the audio, may be a bit loud View all 36 consumer vehicle reviews for the 2012 Mercedes-Benz M-Class on Edmunds, or submit your own review of the 2012 M-Class. SUBJECT: 3. Can often be heard when you are a stop light. After the car has warmed up, the sound goes away.


Using our website search box for both tech help and products, enter the words of the solution. The methods used in this study are based on optimizing the engine calibration to improve the vehicle interior and exterior (engine) noise, even at low ambient temperatures. Cold Engine Enrichment. I've seen numerous concerns here on the forums about people experiencing rough engine start/knocking noise at startup. Yes, this is a common problem on this engine. no model years given. Some are more serious than others, but any noise should be investigated, particularly if it gets louder or faster with rpm. Q: when i start the car in the morning, it makes whining noise for a bit (a few miles, 15-20 mins may be). If there are misfire codes stored, you will also want to diagnose and repair those prior to diagnosing a P050D. My wife's car had one go bad in the past few months. This is programmed into the ECU via a start-up map, which allows a richer The 2012 Mercedes-Benz C200 has 3 problems reported for engine rattle at startup. The dealer thinks it could be the EcoBoost.


When you turn the steering wheel on your Mercedes-Benz you may hear a loud squeaking or weird whining noise. Ending engine tapping noise. Some W212 owners experience a starting noise or a rattling sound coming from the engine. C. 2011 Mercedes-Benz C300 4MATIC / Cold start noise. Let's take a closer look at your C-Class, and get to the bottom of this issue. Engine Click, No Start. E, Instrument clusters From stock or your faulty unit rebuilt with a LIFETIME WARRANTY Knocking Noise From Engine After Sitting Overnight . 2011–2012 Mustang The mechanic put transmission fluid on the belt then the chirping noise is gone then after around 20 miles it came back again and I have the belt replaced. The noise does not affect the running and it disappears when the car reaches normal temperature. Dealer fix the issue by replacing fan belt and tensoner and upgrade software to latest” Peter N. I heard a grinding noise came from the engine around 10-15 seconds noise then it went off.


They may not know enough about complex engine systems to know if it’s something to worry about or not. We've gathered a vast collection of useful articles to help you perform many repairs and upgrades on your Mercedes-Benz. haven't had to deal with a clutch replacement in 35 years, but if they seize or leak enough to be unbalanced, it ain't pretty on the bottom line. Coincidentally, this noise occurred as stated above when some writing was visible momentarily at the top of the auxiliary belt rotation. The start-to-start variation is caused by changes in the individual engine’s stop point; most engines stop at one of about four places. By “clean start” I mean the engine starts quickly, stays running, and drops down to a consistent and smooth idle. It is normal for an engine to make a slight rumble or roar while running but if you hear a distinct rattling noise there is a problem. I drive a 2006 ml350 and whenever I cold start there is a engine "whine" for approx 1 min. I have a 2009 MB C180 Kompressor BlueEFFICIENCY (W204) with a 180,000 mileage on it. Hint: Starter Problem or Low Battery. The whine noise coming from the 2011 Infiniti QX56 was fixed by replacing the Bank 2 (B2) oil jet, the 2 A class-action lawsuit has been filed against Mercedes-Benz and AMG over an alleged defect involving the M156 6. com Hey all, was just wondering if it's normal or it means something is wearing out and needs replacing, every so often when I start the 91 300E I have the hydraulic lifters make noise for a about 3-4 seconds and then shuts off, VERY rarely does it stay on for longer than that, usually happens more if it's been sitting on an incline all night, it is with cold starts only.


When I want to accelerate from slow speeds (first, second gear) and press the accelerator, the car delays a second or two and then jumps forward. Misfire won?t clear until car is switched of and restarted, after which the problem will not occur for the rest of the day. the dealer said it was the injectors. , CA (2015 Mercedes-Benz C-Class C300 . Let’s discuss some of the source areas mechanics find to be the most common places for engine noises to originate from It's when you start the engine when it is either really cold out, or the car has been sitting in a temperature region for a while where it has not been run and exposed to cold conditions. A Mercury TSB (Technical Service Bulletin) pertaining specifically to 2003 - 2004 Grand Marquis, Crown Vic, and Town Car models addresses a “knock during initial cold start”. If I understand correctly this could mean the chain tensioners are 'charging' up while I turn the engine over without fuel. The 2012 Mercedes manual says, “The catalytic converter is preheated for up to 30 seconds after a cold start. If you were knocking real bad from detonation it would always be there and would not be affected by engine temperature. Engine fails to start (M276) If anyone has experienced something similar please chime in. 5 L MPI - COLD ENGINE START-UP CHATTER. Discuss ML270 2002 Hard to start when cold in the alt.


then it disappears. Whining noise when driving goes up and down with engine speed seems to whine more when going through gears. 5 L engine and produced from October 26, 2009 to July 14, 2012, which may exhibit a concern related to unusually loud engine chatter during initial start-up after sitting for several hours. 5L 6cyl 7A) Review Hi , I read many reviews or complaints regarding the famous engine noise or knocking that lasts 2-3 seconds only Q I have a 2006 Honda Accord four-cylinder with 105,000 miles. This bulletin provides information about the timing chain tensioner replacement on some 2014~16MY Cadenza (VG) vehicles, produced from SOP through January 7, 2016, which may experience a brief chattering or rattling noise concern from the engine on start-up, after a cold soak. The car makes a clicking noise but won’t start. It has developed a clicking engine noise on a cold start. is this something to be concered about or is it normal for this engine Top 5 Mercedes-Benz no start problems. 50 per gal. To start with, a car’s ECU decides that the engine has to idle higher when the engine is cold to stop it from stalling. If I start my car, there is a 3-4 seconds of knocking sound. Both of these complaints are generally caused by a problem with cold start enrichment.


The valve part is expensive and labor is not cheap. I haven't had a problem when starting it during other times through out the day. There are 2 possible causes: 1- The valve is bad. - both mechanically stock - C63 does not have rev limiter before redline- A complete source of entertainment, watch free online drama, videos and shows, watch free live channels Bad noise from engine bay. Supersedes Technical Service Bulletin Group 15 number 07-03 dated July 7, 2007 for reasons listed below. 7L engine built on or before 5-1-2011 may exhibit a cold start-up ticking noise coming from the left hand valve cover and lasting up to ten minutes. mercedes engine noise on cold start

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