Originally Posted by patroskam
Hello...I am looking for some help on an issue that is eluding me. I have a '90 YJ with the 2.5... It will fire up and run great for a while (approximately 10-15 minutes) and then it will start to stall under load. If I let off the gas it will idle, but then any pressure on the accelerator will cause it to seemingly choke out again. I have found that if I turn the key off and then start it again (while rolling) I will get another couple of minutes of everything working fine. So before dropping the tank to swap the fuel pump I figured I would ask those more in the know than me and see if I can confirm some of this.
Any help is greatly appreciated.
I am fairly sure that it is not your fuel pump.
I agree. with jokerchieff462 since it does not act up until the engine heats up and your emissions system goes into closed loop mode and runs off of learned memory. Your sensor send signals back to our ECM which measures what they are sent with what they have learned AAND what the factory defaults are. If the ECM finds something out of range and it is a monitored circuit the ECM sets a DTC and the CEL lights up.
As a rule if I do not know when the fuel filter was replaced I would replace it as a matter of maintenance. Why? I bought a brand new '87 Chevy El Camino and it did the exact same thing to me and it ended up being the fuel filter. It gave me grief every so often for the first two years I owned it.
Next does your CEL light up when you start your engine? If not get the bulb replaced.
If it does light up, does it stay lit? Pull any trouble codes that might be stored in the ECM.