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#1
06-03-2007, 03:09 PM
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C240 idle going nuts!
So today I was driving my 01 C240 with 90k - kms and as I waited at a light the idle decides to drop and then rise to 2000rpm almost causing me to drive into the middle of the intersection. I got really scared and parked it back at home.
What could be the cause of this?
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99 C43 98 S420 99 C230K 01 C240 
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#2
06-04-2007, 08:11 AM
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Could be the gas pedal OR the throttle actuator sticking...ANY check engine lamp?
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
06-04-2007, 10:24 AM
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No check engine or messages. This happened while holding the brake. The throttle on this car uses no cables eitheir.
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99 C43 98 S420 99 C230K 01 C240
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#4
06-04-2007, 11:08 AM
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The gas pedal has a potentiometer that could be sending an errant signal w/o causing a check engine lamp OR the actual throttle butterfly could be hanging-up on a carbon build-up.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
06-04-2007, 11:53 AM
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i have seen some have similar issues when there is excessive carbon, try cleaning the unit and see how it goes, once it is clened leave the key on for 3-4 minutes so as to learn the throttle angle
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1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins
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#6
06-04-2007, 12:17 PM
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I'd recommend checking to see if the air filter is properly fitted to the MAF sensor. If it's worked it's way loose, or was installed incorrectly, the engine will breathe in very hot, unfiltered air from under the hood as soon as the vehicle comes to a stop. The sudden change in temperature throws the fuel trim out of whack, causing the problem you describe. I've seen this happen many times.
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#7
06-04-2007, 01:23 PM
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Hmm possibly it is carbon. It is mostly city driven by my mother...it is being checked out today.
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99 C43 98 S420 99 C230K 01 C240
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