Still missing after DME relay, plugs, wires, Dist. cap & Rotor?
 

I have an 87 911 3.2 that was running fine then I went about 3 months without driving it more than just starting it in the garage every 2 weeks or so.

I started it and it was missing some so I decided to change the wires, plugs, dist. cap and rotor & DME relay since I was not sure how long it had been. The car may run better but still has a slight miss when at idle or even when driving normally. The car seem to pull strong when I get on it but several people have heard the car and seem to think its a fire and not a fuel issue. The Fuel filter was also changed recently.

I thought about changing the coil but I hate to keep guessing due to all of the sensors, etc..

I'm trying to avoid just taking it to a shop but I might have to unless someone has something relatively inexpensive I can try.

Thanks for your time in reading my post!

Daniel Womack
1987 Porsche 911 Cab Wide-body
1998 BMW M Roadster
I love speed!!!

Check the ohms on the ref/speed sensors.

sounds like you have a non firing injector. They get that way from sitting, even a short time. Tap it, they will come alive.
Bruce

Possible that you may have a vacuum leak. Sometimes the brake booster hose get's brittle and cracks on the back of the engine. Acquire a vacuum gauge and check manifold vacuum at idle should be near 18 hg.

To test this theory you can feel or listen (with a stethascope) to each injector - they make quite the clicking when they are functional.

Another test you can do is to get an infrared thermometer and look at each exhuast port to check temperatures - a non firing cylinder will be colder than the others... this is a good way to isolate bad injectors, spark plugs or plug wires.

Chuck.H
'89 TurboLookTarga, 342k miles

drive it and then pull the plugs. also check for air leaks. check the intake bolts. injector Orings too. you may just have a smoke test done,

Thanks to each of you. Some of these things I can do others are out of my knowledge scope. I will go forward with what I can and report back.

I appreciate the time spent reading and responding to my post!.

Daniel Womack
1987 Porsche 911 Cab Wide-body
1998 BMW M Roadster
I love speed!!!

How old is the gas?

How's the O2 sensor?

Sent a PM

Thanks again for all of the help / responses. I put 1/2 tank of Super unleaded then added 12 onces of Lucas gas treatment and drove the heck out of the car once it warmed up.

The feeling of driving a Porsche that is running as it should: Priceless!!!

Thanks again to each of you through the years that have helped an average non mechanic be able to drive and own 4 different 911's!!!

Daniel Womack (Booney1golf)
1987 Porsche 911 Cab Wide-body
1998 BMW M Roadster
I love speed!!!