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#1
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Hello again. Question on my 92 500sl with 65k miles.
When I first start the car, it feels like the engine shakes/rumbles for the first 3-5 seconds. This happens almost everytime i start the car, cold or hot. The RPM is about 1000 when first started then drops to about 500/600 when warm. If I recall correctly (?), the problem seemed to first occur when it ws cold, but now it seems to happen when both cold or hot. After the first 3-5 rough seconds, the idle is very steady and smooth, especially in gear. Over the past 12 months, I've had new motor mounts, caps, plugs, gas filter, and 60K mile service. Any assistance would be greatly appreciated!!! THANKS! |
#2
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I hope you replaced the distributor rotors with the caps.
I have had a few fuel injectors fail and drain the fuel pressure resulting in rough starting.
__________________
Benzmac: Donnie Drummonds ASE CERTIFIED MASTER AUTO TECHNICIAN MERCEDES SPECIALIST 11 YRS |
#3
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Thanks for the reply!
I don't believe the rotors were replaced at the same time as the caps. You seem to suggest this is/maybe a problem; what is the issue with doing the caps without the rotors? Also, on the possible bad injectors, how is a bad injector diagnosed? Again, THANKS for the help and your time!!! |
#4
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Could be carbon buildup-when the car's cold, any carbon in a cylinder, as I understand it, acts like a sponge and absorbs some of the fuel. This changes the mixture to lean, and therefore causes the car to stumble.
I had this problem with my M119 V-8, and a couple of cans of BG 44K took care of it. Good luck!
__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss Michael 2014 E63S Estate 2006 SLK55 1995 E500 1986 Porsche 944 turbo |
#5
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any other suggestions? again my problem is:
cold start: engine shakes/rumbles for 3 seconds warm start ( engine shut off for greater than 15 minutes) :engine shakes/rumbles for 3 seconds hot start (engine shut off for less than 15 minutes): no problems THANKS!!!! |
#6
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Same problem in 1991 420. Mechanic says it is probably a leaky injector.
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#7
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Sounds almost exactly like fuel injectors. ESPECIALLY in a cis-based engine like yours with such low mileage. I'd replace them all (around $220 and piece of cake to do yourself).
Satish 1989 560SEC - M119 32V |
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