Strangely my problem is the opposite of yours, smooth in D but rough in N or P. For me it's probably engine mounts, for you trans mounts??
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I have a similar idle problem, but only on rare occasion, and only when the engine doesn't fire the first couple of times I turn the key.
It's 100% my fault for not letting the engine catch, but I can't stand to hear engines/starters protest when they're keyed too long.
Usually, a stab at the accelerator pedal gets everything in order, and the 'check engine' light goes out. What amazes me, is the engine remains running while in-gear, and is remarkably smooth, while idling at what can't be more than 250 RPM...if that.
Is the 'check engine' light coming on? The gearbox oil shouldn't matter, unless it was filled with 90W-140. There may be an idle compensating device, usually used for adjusting for A/C compressor drag, which may be at fault, but I can't imagine putting it in -gear gets the compensator to do anything.
I'll keep a few brain cells on it.
It's 100% my fault for not letting the engine catch, but I can't stand to hear engines/starters protest when they're keyed too long.
Usually, a stab at the accelerator pedal gets everything in order, and the 'check engine' light goes out. What amazes me, is the engine remains running while in-gear, and is remarkably smooth, while idling at what can't be more than 250 RPM...if that.
Is the 'check engine' light coming on? The gearbox oil shouldn't matter, unless it was filled with 90W-140. There may be an idle compensating device, usually used for adjusting for A/C compressor drag, which may be at fault, but I can't imagine putting it in -gear gets the compensator to do anything.
I'll keep a few brain cells on it.
The car itself only has 58,000 miles and is taken care of well.
I do know however, that the engine mounts are gone, and possibly the gearbox mounts. I understand this would cause NVH but not the low idle.
Where should the 2.2L 94 model with 4 speed automatic idle in P and D if anyone knows?
Also, on the topic of the gearbox, it has a S and E (standard/economy) switch. I've toggled between the settings and even though the E is meant to change gears earlier etc, I haven't noticed the slightest of differences in the two settings. Is this just a gimmick that never did anything?
I do know however, that the engine mounts are gone, and possibly the gearbox mounts. I understand this would cause NVH but not the low idle.
Where should the 2.2L 94 model with 4 speed automatic idle in P and D if anyone knows?
Also, on the topic of the gearbox, it has a S and E (standard/economy) switch. I've toggled between the settings and even though the E is meant to change gears earlier etc, I haven't noticed the slightest of differences in the two settings. Is this just a gimmick that never did anything?
I have been having the same problem with my 86 300E with 137K miles but mine stalls in intersections and stop and go traffic. Its fine on P and N but does idle on the rough side. I'm planning to check the EHA and OVP relay this weekend. Can a slapping timing belt cause this?
Any write up on how to do this?
I take it that it's on the throttle body?
If it helps, turning the AC on doesn't raise the idle like on other cars
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