89GTASC

Previous thread I started looked real long, so gonna try to make this shorter, but please view previous thread if you have time to read more details)

Looking for people who might have had these symptoms and what their problem was.

Symptoms: 1 yr ago it used to run "good" for 30 minutes but then start running bad\rough\ like its missing, sounds & runs retarted, has only 1/2 the power.
But over time as we tried replacing parts like plug wires, plugs, rotor, cap, COIL, Mass air flow, fuel filter, -- it no longer runs good for that 1st 30 minutes anymore. Difficulty starting.

Minor symptoms car always had: engine light would come on if outside temperature ever got below 60 degrees. And if you cut engine off after been driving for awhile, it won't restart unless you let car sit for 5 minutes.

Previous years fixes:
-replacing the COIL did fix it before.
-replacing the Mass Air Flow sensor did fix things before.

But now replacing those things did not work. And we replaced other things like plugs, plug wires, fuel filter, and not working.

Probably going to try these next:
Coolant temperature sensor, air intake temp sensor, electronic spark control module, ignition control module.

Thanks for any feedback and your time
--
James N Jenell

89GTASC

My problem ended up being the Fuel Injectors. (There are 2 other threads that received more responses).

vicg1

My injectors were bad... similar sounding to your issue. Measure resistance across injectors when cold then when hot and running rough. You may find some shorting when they get hot.

89GTASC

I started 2 threads on this "general engine" forum and did not get any responses. Then I started 2 threads in the "TPI forum" and those 2 I received alot of help on.

They led me to "it could be faulty injectors", and sure enough that fixed it for me.

Very greatful for all the advice and suggestions I got.