Running better cold is a big clue. The system goes closed loop when it warms up and starts using the O2 sensor to set air fuel. Check the O2 sensor and the exhaust manifold for cracks especially around the collector tubes and for loose or bolts or gasket leaks. You can experiment and disconnect the O2 sensor and it will run in a default mode for the calibration and see if it makes a difference. The other thing we have that is different then the others is the egr. It is the pipe setup under the manifold going to the exhaust. Look for any leaks on the pipe.
No man didnt have time though I will this weekend got to fix my tailights when I press my brake my reverse lights come on and I got a ticket( darn small town cops). But I suspect that it is the o2.
Originally Posted by duckhunter17
89 YJ S, 2.5L/AX-5/NP231
99 WJ Limited, 4.0L/42RE/NP247
93 YJ, 4.0L HO/32RH/NP231 - Sold
tps, isa, wot, and fuel psr. all must adjusted when replaced. You need a meter and the service manual.
Mean Max pics of everything:http://s702.photobucket.com/user/mea...?sort=4&page=0
How to use Google to search the forum:http://www.jeepforum.com/forum/f12/f...oogle-1003734/
Fuel Pressure test:https://www.youtube.com/watch?v=knE_J8xc3hk
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