crispyluck
NAXJA Forum User
- Location
- Front Range, Colorado
Running into a rattle on my lightly modified XJ. It happens at idle, quietly, but gets louder and matches my RPM when accelerating. Goes away as I lighten up on the pedal, to the point you can't hear it while coasting in D. Seems to be coming from around water pump, harmonic balancer area. Doesn't feel like there's a difference in power. Things I've eliminated as causes:
-Exhaust leak. I think I've solved all exhaust leaks, from random loose hoses to replacing the whole exhaust line. Unless the intake is cracked or something else is leaking in a dark corner, it's not exhaust related.
-Nothing is banging against the fans.
-Undercarriage isn't the source of the noise (replaced trans mount, exhaust line is good)
It MIGHT be:
-Water pump
-just replaced harmonic balancer. The old one was getting pulled into the front of the engine. No issues with the new one as far as I can tell, but it does seem like the noise is coming from this area.
- About to replace idler pulley and throw on a new belt.
-Something else messed up inside the block/under the block
-About to throw new motor mounts on as well
Big shrug on this one. Don't really know what I'm looking for outside the engine. It would help to see if I'm forgetting any obvious causes of such a noise. Besides this rattle, engine is doing great, nice and quiet. No obvious issues with the transmission- I replaced filter, pan, and fluid recently.
-Exhaust leak. I think I've solved all exhaust leaks, from random loose hoses to replacing the whole exhaust line. Unless the intake is cracked or something else is leaking in a dark corner, it's not exhaust related.
-Nothing is banging against the fans.
-Undercarriage isn't the source of the noise (replaced trans mount, exhaust line is good)
It MIGHT be:
-Water pump
-just replaced harmonic balancer. The old one was getting pulled into the front of the engine. No issues with the new one as far as I can tell, but it does seem like the noise is coming from this area.
- About to replace idler pulley and throw on a new belt.
-Something else messed up inside the block/under the block
-About to throw new motor mounts on as well
Big shrug on this one. Don't really know what I'm looking for outside the engine. It would help to see if I'm forgetting any obvious causes of such a noise. Besides this rattle, engine is doing great, nice and quiet. No obvious issues with the transmission- I replaced filter, pan, and fluid recently.