Jude Cochran
NAXJA Forum User
- Location
- Roanoke, Virginia
This is my last effort before taking my xj to the shop and spending a bunch of money on diagnostic tests.
2001 xj 4.0 died so i swapped in a 98 4.0. put all new gaskets in the 98, ditched the distributor for the 01's coil pack, new plugs, new rebuilt injectors, adapted 01 o2 wiring for 98 exhaust manifold.
Now the jeep loses power randomly. rpm fluctuates very slightly, but power loss is very noticeable. It doesnt matter how fast im going. I have chased a bunch of vacuum lines and replaced some hoses and connectors and it still bogs down. No thrown codes. I replaced the TPS, cleaned throttle body and IAC with no luck. jeep runs good if i disconnect and reconnect the battery for about 50ish miles then starts to bog down randomly under load.
i am at a complete loss what it could be. It has to be a sensor right? maybe cps was installed wrong? bad injectors or plugs? computer thinking its not getting enough air or gas? or maybe too much? It doesnt smoke. no backfires.
engine does idle a little rough after engine gets hot.
today i started noticing a random thud when it is bogging hard. only heard it like 5 times on my 45min drive home. maybe thats motor mount or trans mount starting to go bad?
Any thoughts or ideas would be greatly appreciated!
2001 xj 4.0 died so i swapped in a 98 4.0. put all new gaskets in the 98, ditched the distributor for the 01's coil pack, new plugs, new rebuilt injectors, adapted 01 o2 wiring for 98 exhaust manifold.
Now the jeep loses power randomly. rpm fluctuates very slightly, but power loss is very noticeable. It doesnt matter how fast im going. I have chased a bunch of vacuum lines and replaced some hoses and connectors and it still bogs down. No thrown codes. I replaced the TPS, cleaned throttle body and IAC with no luck. jeep runs good if i disconnect and reconnect the battery for about 50ish miles then starts to bog down randomly under load.
i am at a complete loss what it could be. It has to be a sensor right? maybe cps was installed wrong? bad injectors or plugs? computer thinking its not getting enough air or gas? or maybe too much? It doesnt smoke. no backfires.
engine does idle a little rough after engine gets hot.
today i started noticing a random thud when it is bogging hard. only heard it like 5 times on my 45min drive home. maybe thats motor mount or trans mount starting to go bad?
Any thoughts or ideas would be greatly appreciated!