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My phone won't let me search and my computer sux. It been about 80 here in Ohio and I have been getting hot. 1998 with 4.0 and auto trans. New radiator about 5 year's ago. I installed it, but the PO bought it. Blew the side off. I typically have sludge at my cap. I replaced the T-stat, the water...

Well, I figured it out. The key on the crank that drives the timing gear failed. There was about 10 degrees of rotation on the gear. That key design is stupid. There is just one little tab that engages the gear and it broke. It looks like the key is hardened. Case hardened possibly. I'm going to...

What critical info am I missing? Thanks

No kidding. I love the 4.0. even the 4.2. bomb proof. Knock on wood. I'll pull the timing cover and check the tensioners on this next weekend. Hopefully the crank and rods will be back for the other one early this week and I can get the other engine back together for the other one.

To check the tensioners I have to pull everything off the front of the engine again. Thats a PITA. The tensioner doesn't explain the 4 different sensors, unless they are in fact all bad except the one. That's where I am at though I guess.

Thanks for the replys. The jeep is a 3.7. it had a blown head gasket, so I replaced it. Yes, the timing is a pain. I replaced the chains and the guides while I was at it because the guides had a bunch of wear. I have had the valve covers off to verify the timing about 6 times. The timing chain...

I have posted this question on the liberty forum and have gotten no response. Frustrated and annoyed at this thing. Throwing cam sensor code and I have tried 4 different cam sensors. Different pcm and checked timing. It will only start on one of the 4 sensors I have. Unplug cam sensor after...

Would it make sense that if I leaked fuel into my cylinders overnight, or after shutting down, then on startup, it pushes a rich mixture into the exhaust system, temporarily causing the O2 sensor to give faulty info to the computer? When this stuttering/stumbling/rough idle happens, the IAC...

If the O2's are bad, would this normally give a code? Can you explain the open loop to closed loop? I get they send signals to the computer to adjust the fuel, timing and whatever. Does the computer ignore them until after warmup? Thanks

I also have no check engine light on. The jeep has 162K miles. The original fuel injectors are back in it. The fuel pressure loan a tool doesn't look like it has a good way to insert the gage in so I can rule out the check valve or the injectors. Why would the O2 sensor/s cause this at the same...

I have had some hugging and chugging issues in the last month. It started with what I think was heat soak. It was 90+ degrees out and in the morning it was about 80. After work it was about 100 on the temp gage in the Jeep. All parts listed are from discount auto parts stores. I know, I...

The gasket shows a hole at one of the water jacket passages between cylinder 3 and 4. I am planning on having it cleaned, pressure checked and if ok, decked. If I take .002" off do I need shims?

Sorry, 1998 XJ 4.0L, 125,000. 4WD.

I have been blowing a bit of white exhaust lately. I got the Jeep with a blown Radiator. Put a new radiator in it. 2500 miles later I blew the lower radiator hose (I reused the old one). After that, I noticed that when I turn it off, the cap releases fluid into the overflow. I didn't notice this...

sort of what I was thinking, but with the CPS being from Autozone, I didn't want to rule that out. I know where the holes are, but which holes need to line up. I heard there were a few.

I have a 98 that I have been driving about a week now. It had a blown radiator when I got it. It sat for 3 years. After going through everything it turned out I fried the computer. I installed a "new" computer from a same year/make/model/ sub model. I flashed the computer and figured it would...

Glad to hear it worked. I am starting to think that the Schumacher charger switching had something to do with it.

I hope yours goes as well as mine.

You wont be drilling that extractor out its too hard. your best bet is to drill a series of small holes around the extractor and see if you can knock it loose with a punch and pull it out. Then just drill the bolt out and re-tap the threads.

Well, it was the PCM. I got one from a guy on craigslist and plugged it in and it fired right up. Thanks for the help limiting the possibilities for what could be wrong. I think that changing the current setting on the charger while it was hooked to the battery might have spiked a higher voltage...