skipc
NAXJA Forum User
- Location
- Georgia & points west and south
This is a question for those with 200k+ miles on their 6 cyl 4.0...
I have 2, both over 250k miles. One has a ticking sound coming from inside the engine at idle. Sounds a bit like a VW diesel, but more pronounced if under the car or against a wall to reflect the sound. Most times you can't hear it inside, and sometimes itis a little louder than others. Only hot, not cold. I put a 160 stat in it and its still there (fyi). It isn't a ping, doesn't sound like valve tap at all, doesn't sound like main bearing, goes up with idle, but quickly goes away as engine noise gets louder. An engine flush may have made it louder (not sure). It's hard to pinpoint, but sounds more like the rear of the engine rather than the front (used a stethoscope).
Not to prompt, but I guess it could be piston slap, but it isn't quite like any piston slap I've heard before, so I can't be sure.
I've also noticed a similar tap in the other XJ, but very faint. You almost can't hear it even up close, and would miss it if you didn't hear the other and be on the lookout. So it seems to be in both at about the same miles. I hope it's normal and safe...
The question is - does this sound familiar to anyone? Is it common at this mileage for this engine? I've only had each after 200k miles (both) so I can't talk about how it was raised I'm hoping it's not only common, but can be disregarded for the next 500k miles!
So, anyone else got this? Any trouble because of it? Know what it is?
Thanks,
Skip
I have 2, both over 250k miles. One has a ticking sound coming from inside the engine at idle. Sounds a bit like a VW diesel, but more pronounced if under the car or against a wall to reflect the sound. Most times you can't hear it inside, and sometimes itis a little louder than others. Only hot, not cold. I put a 160 stat in it and its still there (fyi). It isn't a ping, doesn't sound like valve tap at all, doesn't sound like main bearing, goes up with idle, but quickly goes away as engine noise gets louder. An engine flush may have made it louder (not sure). It's hard to pinpoint, but sounds more like the rear of the engine rather than the front (used a stethoscope).
Not to prompt, but I guess it could be piston slap, but it isn't quite like any piston slap I've heard before, so I can't be sure.
I've also noticed a similar tap in the other XJ, but very faint. You almost can't hear it even up close, and would miss it if you didn't hear the other and be on the lookout. So it seems to be in both at about the same miles. I hope it's normal and safe...
The question is - does this sound familiar to anyone? Is it common at this mileage for this engine? I've only had each after 200k miles (both) so I can't talk about how it was raised I'm hoping it's not only common, but can be disregarded for the next 500k miles!
So, anyone else got this? Any trouble because of it? Know what it is?
Thanks,
Skip