Just bought my 9th Jeep(in possesion, #15 total) last Friday, a 1993 Dark Green Limited 318 Grand, $300, blown out drivers front tire, smashed passengers side lower control arm, and a engine problem that the previous owner described almost perfect. After 30 minutes of run time, regardless of ambient temp or what kind of driving, could be idle, She starts running real rough. Misfire, wont rev above 1500Rpm in neutral, will barely drive unless down hill. Runs like a Champ, up until the 30min mark. The pervious owner has replaced the obvious, and says His certified mechanic father thinks its the ECU. 1993 ECUs are not resined well enough, and when heated, connections pull loose, He says. There Is a collector leak on the ECu, passenger side, Right below....There Are Alot of new parts under the hood, including CPS. Old TPS and MAP though.

 

Any error codes? I would guess its the fuel pump or regulator.

 

Check the fuel pressure when it starts to run crappy.

 

Could it be heat soak of the injectors? Is there shielding on that engine?

 

Not an issue with the V8.

 

She does have good fuel pressure at all times.

 

You may need a fuel pump then.

 

Didn't you mean filter, Busted?

 

Brain fart, yeah filter...maybe

 

maybe the intake manifold gasket..? that happens on my dads camaro, runs great cold but when it warms up, NOPE.

 

Oh, yeah. Isn't there a gasket on the bottom of the intake plenum that sometimes is a problem?

 

You may have a clogged catalytic converter.