Benthos
NAXJA Forum User
- Location
- Northern CA
99 XJ stock daily driver, 230k, well maintained. One owner. I love this car. Had it all my life and it's been incredible.
Only problem... its had the exhaust manifold crack/ leak forever. Always ran fine so never bothered fixings but it's got pretty bad so ordered a replacement.
Recently I've been noticing a very subtle intermittent vibration, almost like a slight missfire after it warms up and the idle drops to 500rpm.
Starting, driving, everything else is normal. If I hadn't had this car so long I prob wouldn't notice.
Cleaned the IAC
Changed the plugs
Cleaned the rotor/ cap contacts
No changes.
What should I be checking?
My intuition says this is an ignition issue. I plan to replace all the ignition components. I saw him someone on YouTube post a video of very similar symptoms and he replaced the ignition coil and not solve the problem so that might be top of my list.
Could my neglected exhaust manifold have damaged my O2 sensors? Can I check them? AVG MPG is about 17. Passes emissions.
Injectors?
I don't think it's a vacuum issue because idle is not high.
Do I just start replacing things one by one?
She is my baby and I feel like she is sick any help diagnosing her would be greatly appreciated.
Only problem... its had the exhaust manifold crack/ leak forever. Always ran fine so never bothered fixings but it's got pretty bad so ordered a replacement.
Recently I've been noticing a very subtle intermittent vibration, almost like a slight missfire after it warms up and the idle drops to 500rpm.
Starting, driving, everything else is normal. If I hadn't had this car so long I prob wouldn't notice.
Cleaned the IAC
Changed the plugs
Cleaned the rotor/ cap contacts
No changes.
What should I be checking?
My intuition says this is an ignition issue. I plan to replace all the ignition components. I saw him someone on YouTube post a video of very similar symptoms and he replaced the ignition coil and not solve the problem so that might be top of my list.
Could my neglected exhaust manifold have damaged my O2 sensors? Can I check them? AVG MPG is about 17. Passes emissions.
Injectors?
I don't think it's a vacuum issue because idle is not high.
Do I just start replacing things one by one?
She is my baby and I feel like she is sick any help diagnosing her would be greatly appreciated.