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I made my own smoke machine with a small air compressor paint can and a cigar. Only smoke that came out of anywhere was around butterfly valve shaft on side of t.b. p0122 p0123 p0172 . Some will come and go but almost always is the too rich code and tps low voltage code . Checked harness for .5v...

Checked compression and I'll good there , looked at the exhaust and intake again for cracks and found nothing. The pcm I believe are different numbers and I'll have to look into that. I'll start there also need a new throttle body I have air getting sucked in around the butterfly valve shaft.

Checked compression and I'll good there , looked at the exhaust and intake again for cracks and found nothing. The pcm I believe are different numbers and I'll have to look into that. I'll start there also need a new throttle body I have air getting sucked in around the butterfly valve shaft.

The new pcm came off a part out xj never did see it run but I replaced the oem pcm because of high idle problems. I did change #3 plug was rich on plug most likely because of miss, oil is not milky and not burning coolant out of exhaust, no cracked valve springs and sea foamed it twice to...

1999 xj 4.0l New 02s up and down. Stream When cold the jeep will run so bad and have a miss at idle will through a code for to rich will have a cyl 3 misfire code all new parts on spark side and new tps iac cts , injectors , header, as soon as it switches from open to closed loop it won't...

Yes it dose just replaced both and I got a flat line for volts on both sensors. Also replaced cap and rotor seemed to help out just alittle

Guess I could mention that at w.o.t it acts normal , will check out o2 sensor graph after work today. Could be a coil problem?

oh wow forgot to edit all the bad spelling out of this i apologize.

ive looked for quite a while now all over and cant find someone that is/was in my boat. just got into this 99 xj about a month ago now and have replaced both o2 sensors ( periviouse owner had cut front o2 sensor plug off so i had to wire it back together) , intake gasket , banks header , 4 hole...