did anyone have this problem when car is cold it runs fine when it's hot it hesitates i changed egr valve 95 lti did plugs and wires

 

Your issue sounds fairly common with the bad opti threads sorry

 

Might spray some throttle body approved carb cleaner on the mass air sensor.Ever so gently (car not running).Hope this helps.

 

Correct me if im wrong but I dont think EGR effects performance.

 

Maybe the o2's going bad running in closed loop drives fine. But once it warms upp and goes to open loop starts dumping to much fuel and fouling out plugs. Its worth a shot anyways put a scanner on it see what it says.




Derek

 

When the car warms up, is when it goes into closed loop.

 

Had that similar issue...for me..it was a bad O2. Easier to check that then to replace your opti. Are you getting any codes?

 

I got the same problem now. Checked the opti, seemed fine. Still the same problem when I reinstalled it. I had no doubt it was opti some ignition problems, but I don't know anymore. Got a code, but can't read it, since it's some problems with the obd...

 

also check the ICM for failure upon heat soak.

 

Oppps sorry!! I got them backwards. But you get the just of it. Thanks for the correction.

 

Definitely get a scanner on it, it's most likely one of the o2's has gone bad.