1983 911 stumbles/misses

husky2033 · 06-12-2021, 04:26 PM

I have a 1983 911. Car runs great 90 percent of time but occasionally it will miss or stumble for just a couple seconds then goes back to running fine. It doesn't seem to speed related its done this at 20mph & 70.

Thnaks

gomezoneill · gomezoneill's Garage

It could be many things to vague of a question. Could be ignition could be CIS.

husky2033 · 06-13-2021, 03:02 PM

The only way I can describe is it starts & runs very well. This issue is very intermittent. It only seems to happen after motor is warm but feels like it stops running for just a few seconds & then picks right up and runs fine. You just feel a pause & then it continues on like nothing happened.

Funracer · Funracer's Garage

Green wire maybe? Do a search for green wire.
Or coil going bad?

Sounds electrical to me. Good luck and let us know if you get it figured out.

husky2033 · 06-14-2021, 05:55 PM

The coil is only a year old but would be an easy part to change. I'll order a coil & look into green wire. Electric issues are not really my area of expertise.
Thanks

stlrj · 06-14-2021, 08:45 PM

Ignition? Spray some water or windex on your ignition cables at idle and see what happens. That might tell you all you need to know.

Funracer · Funracer's Garage

Quote:

Originally Posted by stlrj

Ignition? Spray some water or windex on your ignition cables at idle and see what happens. That might tell you all you need to know.

I have not heard of that trick. What will it show you?

gomezoneill · gomezoneill's Garage

Quote:

Originally Posted by Funracer

I have not heard of that trick. What will it show you?

Arching to ground or cross wire. Do it at night and you'll see if there's a problem.

stlrj · 05:34 AM

Quote:

Originally Posted by Funracer

I have not heard of that trick. What will it show you?

If your ignition cables are screwed up silly.

Better still, take it to any mechanic and have him do it for you. He'll even be able to tell you which cable is causing the missfire and you'll never get your hands dirty.

Funracer · Funracer's Garage

Quote:

Originally Posted by stlrj

If your ignition cables are screwed up silly.

Better still, take it to any mechanic and have him do it for you. He'll even be able to tell you which cable is causing the missfire and you'll never get your hands dirty.

I have heard of looking for arcing in the dark but had not heard of spraying water on it. Nice to learn something new. And I am only 63!