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Rough Running '86 3.2


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I have a rough running '86 911. It is a 30,000 mile original car, 2nd owner. Was running fine and then all of a sudden it seems to be running on 4 or 5 cylinders. I do not believe it is the gasoline as it started to run this way at half a tank from a fill up from the same gas station I've always used.

No backfires, spitting or pops; just runs rough as. I could start with puling plugs to see which cylinder is the culprit, but I would like some more ideas before I start to work on it.

I have lots of general suspicians but would like to know what you would do in this situation. Does anyone have a good progression of what to check and in what order?


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Thanks, that is a great first step. I am also looking for what to do after that. In other words, a kind of a flow chart of what to try and in what order if you were to have the same problem.


Edited by spg356
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  • 8 months later...

all the above mentioned... when they say check the leads, a quick one is to just make sure they are all seated properly... they tend to vibrate loose when they get old and sloppy and kind of just sit on top of the spark plug.

since removing the wire is the first step to getting at the plug you need to make sure one isnt loose before you take it all apart and possibly not find anything wrong (look deep inside the lead with a light if you see green corrosion replace them)

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  • 4 weeks later...

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