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Old 03-26-2009, 04:28 PM
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Join Date: Aug 2007
Location: Philadelphia
Posts: 1,018
94 E500 Idle Issues

My 94 E500 is driving me bonkers. Over the last year, the ASR light has been coming on and the car has gone into LH mode reguarly. However, it has always been controllable because if you turned the car off and let it sit for about thirty seconds, it would restart in normal mode. However, it started happening more frequently, and a month ago I took the car to my Indy to try to figure it out.

The car still had the original harness, so I wasn't too surprised when he noticed the fraying and decaying there. He said he couldn't diagnose the numerous fault codes he was getting without a proper harness. So we replaced that. Then, the fault codes were gone, but the car idles very poorly, and the timing swings from one extreme to another: about -20 to +20. After running like that for a few minutes, the idle goes down below 400 and the car eventually shuts off.

The Indy found a bad idle switch and problems with the throttle cable. Those were replaced, no luck. My man then concluded that it must be the ETA. So in went a rebuilt Beckman Technologies ETA. Didn't change either. Then I bought a used EZL (no easy feat) and we tried subbing that in, but it didn't change anything in the way the car is running. So now I have a spare EZL. The car remains undrivable.

So, question is, what would affect the timing so much that it does not remain steady and then drops the idle so far down that the car shuts off?
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1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k
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