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rough idle/coil issue? 93 850 850 1993

Ok, I know I've asked a TON of questions, and probably annoyed some, but here is my latest.

As I said in another thread, I had a temporary elbow on the line, test drove it and the car ran great for a bit and then it ran rough at idle. Almost like it was stalling/miss-firing. When I got home, I noticed that the replacement hose seemed to get kinked and maybe that was why it ran rough on the highway.

I replaced it with an elbow (finally got the kit), took it for a spin and car ran decent. A little rough idle, not as good as it did when I first got the car/before the timing belt/serpentine belt replacement. But I noticed that it was getting worse.


The car still runs a little rough at idle. Not looping, not detonating, just like it's miss-firing. At higher speeds, this symptom is not shown. Also when I test drove it, I noticed that as it it goes from 2nd into 3rd or 3rd into 4th gear (not sure which one) and the RPM's drop below 2000, the car runs a little rough. Above 2000 RPM's and its better.

I also noticed that when I'm sitting in the car, the exhaust/muffler seems to rattle some, but that could be completely unrelated.

Anyways, one of the thing i first suspected (what is now a month + ago) was the coil. When I tested it before, it seemed to be fine. But I think I didn't test it correctly.

So I checked the coil for OHMS again. This time, I unplugged everything from it, and disconnected the negative cable from the battery.

Checked the OHMS on the multimeter (setting it to 2, so it would read as X.000 instead of XX.00, etc). In a thread I found on here, someone said that the coil should read between .5 and 1.5.

Mine read as .225 or .250, depending on if I'm holding my breath or not.

So, could that explain why the car feels like it's miss-firing a bit? The car obviously still starts, but I'm just curious if I'm chasing something that isn't necessarily in need of being chased (the coil).

Again, thanks for all the help you provide, and putting up with my incessant questions. My issues always seem to come up when the shops arent open.
--
1985 245. 246K Gone..but not forgotten.






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New rough idle/coil issue? 93 850 [850][1993]
posted by  Shaughnessy  on Sat Nov 29 17:03 CST 2014 >


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