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#1
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Poor Idle
I have a 85 500SL that will not idle below 2000 rpm. I replaced the o2 sensor and then it would not crank. Disconnected the o2 sensor and it goes back to very rough idle below 2000 rpm. Runs great above that up to 100 mph. There was heavy carbon on the 02 sensor. Acts like it is flooding out at the low rpms. Any suggestions???
Ken |
#2
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That car as well as most models after 1980 has an electronic idle speed computer. That computer gets power from the overvoltage relay just above the fuse box, I would start there!
__________________
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 |
#3
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mr. MB DOC
I have a w124 300E 24valve yr1990. my car initially has an overload relay with two fuse inside and recently replace a new relay with only one single fuse. the shop told me they are same. are they correct? Is this single fuse relay suit my engine? advice pls. |
#4
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85 500 SL Poor Idle
ThanksM.B. Doc, I will check that out and replace it. Thanks again.
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#5
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85 500 SL Idle Problem
I cannot find the fuse box or the idle sensor. Guess I do not know where to look. I took the car out today and ran it about 40 miles at up to 100 mph. It seems to idle better now that it has run some. But still not smooth. The encomy guage is in the red most of the time.The vacuum lines are all very hard, could it be a vacuum leak??
HELP PLEASE!!! |
#6
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Quote:
Buy or borrow a MityVac and track down your leaks leaks. HINT: On our diesels, the soft rubber connector that harden up are very common sources of vacuum leaks. Best Regards, Jim |
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