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Hello! 1999 Jeep 4.0 manual. It started making a weird sound a few days ago. Today I pulled the serpentine and started it so I record this sound. It seems like it's coming from the front, lower down, maybe around the harmonic balancer. My buddy thinks it's the timing chain, wanted to...

Hello! 1999 TJ 4.0 manual. At 2am today I was driving home, stopped at a light, and when I pressed the gas to move the engine stalled and would not restart. It cranks hard, battery is fine, but wouldn't start. Today I checked my fuses and it looks like #18 under the hood, labeled as "fuel...

Hello! Just removed my shifter starting a clutch replacement and I noticed there's this wiring harness and the wires on it looked chewed through. Can someone tell me what these wires are these harnesses is go to? 99 TJ 4.0 Manual

Are they? Good, I wasn't sure. So that leads me back to thinking the miss is electronic. The only thing so far that's made any impact was replacing the ignition coil. I didn't hear the miss after it was replaced, my mechanic didn't hear the miss, but it came back a few days later. It's...

New compression test, in order cylinders 1 - 6: 142 155 152 172 162 158

I'm considering pulling the head and taking it to a machine shop. I'm still driving it, it's behaving well otherwise, but I want to fix this before it leads to other problems. Hmmm. I'll look into those, I'm really just out of ideas other than maybe a tiny amount of coolant is leaking through...

Bummer. Hoping for an easy fix. I'm thinking there's got to be an electrical issue somewhere. At this point I'm tempted to get a oscilloscope and check every circuit in the thing. I may go have the compression checked again, maybe the first mechanic botched it. Thank you! Have some tests...

Sorry, ended up in the hospital, took some of the steam out of my repairs. I replaced the throttle body again, this time replacing the TPS as well, now it's running normally other than the miss. I had my fuel injectors cleaned on one of those injector rigs. They all sprayed well, just a...

I changed the TB entirely a few days ago, unfortunately no change to the miss. I swapped the IAC with an off brand, no change so I swapped it back. When I cleaned the TB I followed a post of Jerry Bransford; ran the Jeep and sprayed directly in the TB, let it get close to stalling a few...

Wasn't the distributor. Moving on to fuel injectors next.

Exactly. But even sealing it all up, confirmed with the smoke test, the Jeep barely ran. Put the old one back on, it's back to where it was.

It really makes no sense that it would make a difference. I even noticed on the new TB that the IAC sat a little loose, so I replaced the o-ring and no change. Stopped and started the Jeep multiple times and it ran terribly. Then as soon as I put the old one back in it started to run more...

Reinstalled the old TB, everything went back to the way it was. At least I'm no worse off. But it's strange that the miss went away for a short time.

Replaced the throttle body today, confirmed with a smoke tester that there were no leaks. When I started it, it ran great, no miss. Then slowly the miss came back, then the idle got rough, then it started trying to die, and when I ran my scanner I have both upstream and downstream O2 high...

Guesswork based on experience, but no testing on-site, so all with a grain of salt. Ordered an automotive smoke machine. I hooked my vacuum tester to the intake the other day and the vacuum leak was back, and I'm done chasing it with starter fluid. I found the throttle body leak is still...

Okay, took it to a guy who rebuilds 4.0s, as well as race cars and vintage cars. He listened, said it doesn't sound like it's from the engine failing in any way, he said it sounds electrical or ignition. He suggested replacing the distributor, which is something I probably need to do anyways...

You know the sound when you let off the gas while in gear? The popping from the exhaust? It's similar to that, just much milder. That's the closest sound to what my engine is making.

The stethoscope says all injectors are clicking, and at the same rate. Tried with the probe against pretty much every surface of that engine that I could reach and I can't hear the miss from anywhere, but it's there. Discovered that one of the ears that the distro cap bolts to on the...

Hello! I'm looking to replace my distributor. I notice you can't find Mopar on RockAuto or Amazon, it looks like the best ones they have listed are Cardone. New https://www.rockauto.com/en/moreinfo.php?pk=12964005&cc=1431777&pt=7108&jsn=603 Reman...