LedSled
NAXJA Forum User
- Location
- Central Texas
I’ve been having problems with a miss that comes and goes here’s what’s going on. It’s a 2001 4.0l with 226k miles. Everything stock engine wise except for k suspension 4 hole injectors and heat shielding. All injectors are wrapped. Jeep was running good accelerated hard a few weeks ago and check engine light started blinking. Wasn’t far from the house so I drove home and shut it off. Turned it back on and the check engine light was on but not blinking. Idled rough tho, so I ran the codes and got back a P0301 cylinder 1 misfire. A few hours later walked out started it up and drove again. Check engine light was still on but idle was not rough. Next start up check engine light was gone idled fine drove good. Was fine for a few days then on a 3hr drive, check engine light started blinking again halfway there and started stalling with acceleration. Pulled over shut it off turned back on. Idled fine check engine light there but not blinking. Now check engine light is intermittent and a lot of times it idles fine and sometimes it’s rough.
So here what I’ve done.
Swapped number one and 3 injectors no change.
Pulled number one injector plug while it was idling rough. This did not affect idle. But pulling a different injector plug did effect idle.
Replaced number 1 spark plug. Still intermitent rough idle.
Could it be TPS? Or possibly CPS?
Coil pack was replaced less that 3k miles ago.
Lastly I noticed two other things. Seems to have a tapping noise when idle is rough, and also it seems to shift into OD too early.
So here what I’ve done.
Swapped number one and 3 injectors no change.
Pulled number one injector plug while it was idling rough. This did not affect idle. But pulling a different injector plug did effect idle.
Replaced number 1 spark plug. Still intermitent rough idle.
Could it be TPS? Or possibly CPS?
Coil pack was replaced less that 3k miles ago.
Lastly I noticed two other things. Seems to have a tapping noise when idle is rough, and also it seems to shift into OD too early.