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Old 03-04-2008, 09:47 AM   #1 (permalink)
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Date registered: Oct 2006
Vehicle: 1982 300d turbo-diesel
Location: california, so cal
Posts: 157
300e idle's rough when warm...

Hi, just bought a 88 300e and it idles fine when cold, but when warm it idles a little over 500 rpm... I took my ovp relay and when i shake it i hear tick tick tick from the relay... Also my abs light came on and off...I shouldn't hear anything from the relay when i shake it right?
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1985 300d 212,000 (2nd owner)mine
1988 300e 173,000 (i'm the second owner)
1982 300d 260,407 (gave to scrapyard)
1983 240d 206,349 (sold)
1980 300d 324,xxx (mine)(sold)
1977 240d 214,xxx (dads baby)
1978 300d 179,xxx (parts car)
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1969 250s (dads)

Last edited by turbodieselguy : 03-04-2008 at 09:52 AM.
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Old 03-04-2008, 05:33 PM   #2 (permalink)
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Date registered: Dec 2007
Vehicle: 1992 300 CE, 1990 535is,1997 528i, 2000 328ci,1991 300e,1994 325ci convertible
Location: Lawrenceville, Ga
Posts: 16
That sure resolved my issue. I live in a state that emissions are required, would not pass emissions at all. I had to took a trip to my mechanic. He stated that the first sign that the brain/computer is not receiving power is when the ABS light comes on. He stated it was a common problem. He replaced the relay behind the battery and everything was smooth from that point. I believe that is the one you're referring too? The idle was much better afterwards and the ABS light went off and stayed off. I have 92 300ce.
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Old 03-04-2008, 07:26 PM   #3 (permalink)
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Date registered: Oct 2006
Vehicle: 1982 300d turbo-diesel
Location: california, so cal
Posts: 157
If the relay was bad wouldn't the check engine light come on, and my car passed emissions....Yes , it sits behind the battery with a red top and two fuses. How do u you test the relay??
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Old 03-06-2008, 06:24 PM   #4 (permalink)
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Date registered: Mar 2008
Vehicle: 300E
Location: Alabama
Posts: 2
Hi, Did U find an answer for your problem, I have an 300E 3.2L and it is idling and accelerating rough when it gets wormed up. I am also looking for a code reader for that car, Thanks in advance.
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Old 03-07-2008, 12:34 PM   #5 (permalink)
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Date registered: Oct 2006
Vehicle: 1982 300d turbo-diesel
Location: california, so cal
Posts: 157
Update: Just installed new wires and spark plugs, and problem is still there...I'm thinking it could be the water temperature sender on the cylinder head that's not telling the computer the right information?
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Old 03-07-2008, 12:49 PM   #6 (permalink)
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Date registered: Jun 2005
Vehicle: 86 190E 2.3 16V, 90 300CE, 93 400E, 02 Olds Aurora
Location: Seminole, FL
Posts: 1,392
The correct sensor will be the engine temperature sensor. It is the one located furthest back on the head, close to the fire wall.

Good Luck,

Jayare
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Old 03-07-2008, 05:45 PM   #7 (permalink)
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Date registered: Oct 2006
Vehicle: 1982 300d turbo-diesel
Location: california, so cal
Posts: 157
I just took my distributor cap and rotor off and both are toasted...Already ordered ordered a new cap and rotor from autohaus arizona...

Last edited by turbodieselguy : 03-07-2008 at 05:48 PM.
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