Loud ticking noise when starting engine after cold night? - Mercedes-Benz Forum

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post #1 of 10 (permalink) Old 12-27-2008, 08:13 AM Thread Starter
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Loud ticking noise when starting engine after cold night?

I get a loud ticking noise for about 30 seconds when I start the car after it has sat overnight on a cold night (sub zero).

Lasts about 30 seconds, doesn't get louder when you rev the engine but does get louder when you drive the car.

Just suddenly stops after about 30 seconds to 1 minute of driving.

Anyone have any ideas?

SL350 SPORT 2009
SLK55 AMG, SLK 350 , SLK 230K, MR2, Mitsubishi GTO 3000
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post #2 of 10 (permalink) Old 12-28-2008, 01:21 AM
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The most likely cause is lash adjuster noise. As the engine sits overnight, the oil drains back to the oilpan. Of course, first thing in the morning with the oil being thicker, it takes a little while for the lash adjusters to pump up with oil. It is normal on many cars, including my C240. The only time you should be concerned about it is if it doesn't go away. If it doesn't go away, the most likely cause is low oil level or bad adjusters.
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post #3 of 10 (permalink) Old 12-28-2008, 01:15 PM
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maybe it's a bomb
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post #4 of 10 (permalink) Old 11-11-2010, 10:02 AM
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I had this same thing happen to me, wound up being a bad piston
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post #5 of 10 (permalink) Old 12-11-2010, 08:16 PM
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what car/engine is this in? sounds like lifter ticking/tapping. once engine warms up the clearances fine and the lifter gets enough oil pressure. Or the secondary air injection turning on which makes a "dieseling" type noise which is normal for the newer vehicles
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post #6 of 10 (permalink) Old 01-06-2011, 10:16 AM
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My car also makes a tapping, clicking noise upon start up for a while. I havent had any problems and i've owned the car about 3-4 years.

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post #7 of 10 (permalink) Old 02-22-2011, 12:31 PM
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my car had a ticking nose when i drive but goes away when in N. any ideas?
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post #8 of 10 (permalink) Old 01-06-2012, 12:09 AM
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My wife's car had a similar problem but it only happened once for some reason. Don't know if that was related to cold weather (we always kept the car in the garage though)...anyway, I did notice that we need to add 1.5 qt of oil as the oil level seems to be running low. We just did service B which includes changing oil, but I don't know what type of oil the mechanic changed (I think it's Mobil 1, but not sure if it's 5W40 or something else). If I go buy some Mobil 1 oil can I just top it off? Does it matter to mix two different ratings of engine oil (as long as they are both Mobil 1 synthetic)?? For colder weather what ratings of oil should I use? Thanks!
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post #9 of 10 (permalink) Old 02-05-2012, 09:46 AM
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My SLK 2005 had the problem few years back, was one of the pulley, replaced and the clicking stopped for few years till few mont go. Bring the car in the shop 2 more times kept overnite, replace other parts but not the clicking noise, they told me they don't hear any noise at start at all. Bring my car home, start my car the next morning the noise still there. I have notice the noice only on a moist or rainy day. total bill 1700 $, problem not solved.

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post #10 of 10 (permalink) Old 06-16-2013, 09:07 PM
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I had a similar problem, the engine would tick after it sat for a while, being the engine did not have a whole lot of miles I really didn't even consider the lash adjusters ("lifters" to some of you), I am a maintenance freak and change the oil every 3000 miles regardless of MB's recommendation.
While changing the oil I noticed it was taking a very long time for the oil to drain (Yea, I do it the good ole fashioned way and actually drain it!), so being the oil pan is very easy to remove I decided to remove it and have a look, I was SHOCKED to see SLUDGE come out, and not just a little, I'd say about 2.5 gallons of it. You can imagine, I was sick to my stomach and just decided to clean it out best I could, so I scooped, wiped, and brake cleaned for 2 days and let it drip for another day, afterwards I refilled it and installed a new oil filter (which was also previously clogged with sludge also) and ran the car for about 30 minutes and drained it and refilled it and replaced the filter once more.
That was probably 20 thousand miles ago and the engine is as quiet as a new one and I have never heard a tic again.
MB dealers use suction via the dipstick tube to remove your engine oil, logically I don't think this is the best method and believe this may have contributed to the sludge.
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