Balmy V-8itude - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 08-14-2006, 02:52 PM Thread Starter
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Vehicle: 1992 400E W124.034 119.975
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Balmy V-8itude

This seems most likely general as well as specific to the W124 so I'm giong to post it here as well.

A “hiccup” has occurred from time-to-time, mostly in the winter-time for the past year. Now it’s summer and I haven’t experienced it in about 3 months. I had to leave the car outside for a couple of nights however, and low and behold, along with the accumulation of mist on the car (= high humidity) comes the problem.

When starting cold, with high humidity, the engine has an erratic idle, down to 300 rpm on tach, almost dying, then catching itself and revving up. Driving just a couple of miles eliminates the issue.

I back out of my driveway onto a slight upward incline, and under the conditions described above, the engine when shifted into drive seems to forget that it needs to rev-up, sort of sits sputtering, and running so slowly it allows the car to drift backwards in first, and grudgingly catch as I give it more and more gas.

Now, initially (earlier in the year) I feared transmission issues, until I started to pay attention to the tach, and realized that in every instance the engine was simply running too slow to engage first gear. When it’s sunny and warm, or tucked in the garage – no problemo. So this pretty much cements my suspicion that it is the high humidity that’s causing the rough idle.

Anyone aware of which sensor controlling / affecting idle would be most likely to be affected so much by high-humidity, and would correct itself after just a few miles of driving? ’92 400E, 4.2litre 119 975 engine. Scott
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post #2 of 3 (permalink) Old 08-14-2006, 03:02 PM
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Bad distributor cap and/or plug wires could cause that.

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post #3 of 3 (permalink) Old 08-15-2006, 02:26 AM
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