milan@hcrvx1.UUCP (Milan Strnad) (01/24/86)
After my Pontiac 6000 (6 cyl. 2.8l, automatic) reached 3 years of age (warranty runs out at this point too), it started to give me pretty strange behaviour. When I start it in the morning, it runs/idles *very* rough for about 2 minutes, and then smoothes as the revs increase. I've had it looked at by a Pontiac dealership. They made carburator adjustments, and it seemed to help a little bit for 3 or 4 weeks. After that, it's back to rough starts again. Anyone has this problem also?
ahs@burl.UUCP (Spinks Albert H. ) (01/25/86)
> After my Pontiac 6000 (6 cyl. 2.8l, automatic) reached 3 years of age > (warranty runs out at this point too), it started to give me pretty > strange behaviour. When I start it in the morning, it runs/idles *very* > rough for about 2 minutes, and then smoothes as the revs increase. I've had > it looked at by a Pontiac dealership. They made carburator adjustments, and > it seemed to help a little bit for 3 or 4 weeks. After that, it's back to > rough starts again. Anyone has this problem also? *** REPLACE THIS LINE WITH YOUR MESSAGE *** At least four times in my life I have discovered rough idle of my cars has been caused by worn/defective ignition wiring. One of these times I would have sworn that I had a defective timing chain; another time I would have sworn that I had a burned valve; but both times I homed in on the ignition wiring. The best was to detect the problem I found was to run the engine in near total darkness who that you can see any small arcing. Sometimes the problem has shown up as excessive 'glow' (there is a more sophisticated term that escapes me at the moment) around the defective portion of the wiring. The results can be arcing between wires to cause cross firing (thus cause symptoms that can sound like burned valves) or just plain missing when shorting to ground. Since your car has only 6000 miles or so I would be surprised if this was your problem. Thought however it would pay to bring it up since I have experienced the wire problem so often. In some engine course that I have taken, I remember it claimed that something like 95% of the engine problems can be traced to ignition problems; this has consistenly been my experience. Good luck, al spinks w -- Albert H. Spinks