Hello
I'm new to
my name is Drew.
I've been having a misfire issue on my jeep that i am trying to diagnose with no luck.
2001 Jeep cherokee Xj 4.0 Auto 4x4
Codes are p0302 p0305
On first start up the engine runs fine with no misfires. Once you rev the engine or drive it above 2800-3000 RPM you get a flashing check engine light with the p0302 p0305 codes. If you pull over and shut the engine off and then restart it, it will not misfire until taken to 28-3000 RPM again even with a stored code. I also notice that once it misfires it will kill the cylinder 2&5 Injectors. You can pull the connectors with no change to the engine.
I have done a smoke test to verify there are no vacuum leaks along with a compression and fuel pressure test all passed.
I have also replaced the following
New OEM mopar crank sensor
New OEM mopar cam sensor
New OEM mopar oil pressure sensor
New Champion spark plugs
New Coil
New Air filter
New Intake air temp sensor
New Map sensor
All 4 New O2 sensors (NTK)
Fresh oil and filter
Good used Engine wiring harness (Original harness had multiple splices and butchered fixes)
New 4 pintle injectors
Full Fresh tank of 91 octane fuel
Any ideas im at a loss here and just want to wheel my jeep again!
I'm new to
my name is Drew.I've been having a misfire issue on my jeep that i am trying to diagnose with no luck.
2001 Jeep cherokee Xj 4.0 Auto 4x4
Codes are p0302 p0305
On first start up the engine runs fine with no misfires. Once you rev the engine or drive it above 2800-3000 RPM you get a flashing check engine light with the p0302 p0305 codes. If you pull over and shut the engine off and then restart it, it will not misfire until taken to 28-3000 RPM again even with a stored code. I also notice that once it misfires it will kill the cylinder 2&5 Injectors. You can pull the connectors with no change to the engine.
I have done a smoke test to verify there are no vacuum leaks along with a compression and fuel pressure test all passed.
I have also replaced the following
New OEM mopar crank sensor
New OEM mopar cam sensor
New OEM mopar oil pressure sensor
New Champion spark plugs
New Coil
New Air filter
New Intake air temp sensor
New Map sensor
All 4 New O2 sensors (NTK)
Fresh oil and filter
Good used Engine wiring harness (Original harness had multiple splices and butchered fixes)
New 4 pintle injectors
Full Fresh tank of 91 octane fuel
Any ideas im at a loss here and just want to wheel my jeep again!