Jeepngdave
NAXJA Forum User
- Location
- Missouri
A couple of days ago My 96 cherokee sport with 4.0 engine and auto transmission started stumbling, hesitating, missing and when I give it more gas, spits or backfires before accelerating.
:dunno:It does not do it all the time. Mainly it does it after taking off from a standing start or before, during or after the transmission shifts from 1st to 2nd or 2nd to 3rd gear. The first time it did it was after I made a hard left hand U turn and it did it a couple of more times on the way home. I checked the ignition timing with a timing lite when I got home and it was ok but the mark on the fly wheel varies about 2 degrees everytime the light flashes.
I performed the shade tree fuel pressure test and gas shoots out the valve on the fuel rail when I depress the valve with the key on. I don't have a fuel pressure gague to check the psi. I replaced the fuel filter yesterday even though it was only about a year and a half old and there's no change.
About a month ago I replaced the CPS which cured a no-crank no-start problem. I checked all the emission sensors and ignition coil at that time and they all checked ok and I replaced the distributer cap and rotor also.
The jeep starts easily on the first try but these stumble/hesitation/misfire/spitting episodes are getting more frequent.
Ocassionally, when I'm comming to a stop, the engine misfires and acts like its going to die and it feels like the transmission doesn't down shift into a lower gear until I've come to a complete stop. Then, the engine is sluggish when I take off and if I give it more throttle the engine hesitates, then there is a spitting noise like my old chevy used to make when the accelorator pump in the carburator was worn out. Once past the hesitation and spit the engine accelerates normally.
Has anyone out there had or heard of a similar experiance and can suguest where I can start looking to correct this problem?
:dunno:It does not do it all the time. Mainly it does it after taking off from a standing start or before, during or after the transmission shifts from 1st to 2nd or 2nd to 3rd gear. The first time it did it was after I made a hard left hand U turn and it did it a couple of more times on the way home. I checked the ignition timing with a timing lite when I got home and it was ok but the mark on the fly wheel varies about 2 degrees everytime the light flashes.
I performed the shade tree fuel pressure test and gas shoots out the valve on the fuel rail when I depress the valve with the key on. I don't have a fuel pressure gague to check the psi. I replaced the fuel filter yesterday even though it was only about a year and a half old and there's no change.
About a month ago I replaced the CPS which cured a no-crank no-start problem. I checked all the emission sensors and ignition coil at that time and they all checked ok and I replaced the distributer cap and rotor also.
The jeep starts easily on the first try but these stumble/hesitation/misfire/spitting episodes are getting more frequent.
Ocassionally, when I'm comming to a stop, the engine misfires and acts like its going to die and it feels like the transmission doesn't down shift into a lower gear until I've come to a complete stop. Then, the engine is sluggish when I take off and if I give it more throttle the engine hesitates, then there is a spitting noise like my old chevy used to make when the accelorator pump in the carburator was worn out. Once past the hesitation and spit the engine accelerates normally.
Has anyone out there had or heard of a similar experiance and can suguest where I can start looking to correct this problem?