GreatOdin'sRaven
NAXJA Forum User
- Location
- Las Vegas, NV
1999 XJ | 4.0L | 140K Miles
Sorry for another engine knock thread, I've done hours of research, searching forums and this is my last resort.
PROBLEM
SPECIFICS
TROUBLESHOOTING
OTHER ISSUES
RELATED HISTORY
1.5 years ago the Jeep needed a water plug change. In the process, I changed A LOT of parts all at the same time. The jeep has had engine performance issues ever since. It's just never run the same.... Here's a list of those parts:
I'm about to take this thing apart down to the head gasket again, but would love any insight on what I can do to troubleshoot the issue before I start throwing parts or wasting my time doing unnecessary maintenance. Please help.
Sorry for another engine knock thread, I've done hours of research, searching forums and this is my last resort.
PROBLEM
- Engine sounds like a diesel when idling. knock or tick (idk the difference)
- Here's an audio file: https://drive.google.com/file/d/1jSdImiEWnu6Iynlt_geChBFde8M69qlw/view?usp=sharing
SPECIFICS
- Started after I drove from FL to NV 3 months ago with a U-Haul Trailer
- No sound when completely cold
- Sounds starts about about 30 seconds after it warms up
- Seems to go away when I give it some throttle (or engine is too loud to hear knocking)
- I'm not sure if it increases with RPM's but it doesn't get any louder with throttle
- I can only hear it at idle
- Louder when i'm underneath the Jeep
TROUBLESHOOTING
- I already removed all 4 flex plate bolts and tightened the hell out of them, sound still exists
- I put high octane fuel to determine if it was a detonation issue, sound didn't change
- I removed spark plugs one by one, no change
- I used a mechanics stethoscope and listened to the top of the valve cover, it all sounds the same to me
- Compression is steady in all 6 cyl
- Fuel pressure holds near 50psi after 30 min
OTHER ISSUES
- I will randomly get a Cyl 1 Misfire
- Currently have Cyl 1 and 3 Codes
- Once in awhile, at slower speeds I will press the gas pedal and the jeep will just move at the same speed then all of a sudden lunge forward aggressively (like a late reaction to the gas pedal being pushed)
- Has lack of power, esp when accelerating.
- I have a slight vacuum leak that affects my A/C when accelerating
RELATED HISTORY
1.5 years ago the Jeep needed a water plug change. In the process, I changed A LOT of parts all at the same time. The jeep has had engine performance issues ever since. It's just never run the same.... Here's a list of those parts:
- Head was resurfaced and checked for cracks
- Head gasket changed
- Fuel Injectors Swapped (corroded/cracked)
- Air Intake Replaced (cracked)
- Exhaust Manifold (cracked)
- plugs, wires, distributor, cap all replaced (for fun)
I'm about to take this thing apart down to the head gasket again, but would love any insight on what I can do to troubleshoot the issue before I start throwing parts or wasting my time doing unnecessary maintenance. Please help.