Recent content by ZCar

OK Here is the latest update. Had the injectors serviced and replaced 2 as they were leaking fuel onto the manifold. Installed a new O2 sensor. Installed new plugs. Current symptoms are: Jeep start good and always runs good at idle and under load when cold. When warm (about half of the...

Tug and Nick, Thank you for your response. Nick, it seems that the problem gets worse as the engine warms up. I will replace the O2 sensor and see if that helps. Tug, I will check the timing. I do not know why I had not thought of that but for some reason I though that the computer would...

Have a 1990 4.0L Cherokee automatic transmission that is backfiring on acceleration or load (going up a hill). Runs great down hill (of course) and idles good. In order to go up hill I have to floor the accelerator and kick it down in low gear. It seems to work fine if I floor the accelerator...

Does anyone have a readily available, well written and illustrated, source of information for all of the sensors on a 1990 Jeep Cherokee 4.0L? Of particular concern is the O2 sensor and anything that would be related to an engine missing and backfiring problem when accelerating or climbing...

cj5 owners, or everyone... question New to the forum but owned jeeps since 1947. I currently have 3 (2002, 1994, and 1990). The 1990 is giving me some problem. Sometimes (50-60% of the time) when I am driving under an acceleration or load situation it starts to backfire and sputter. If...