I have issues. NEED HELP
The Cherokee works like a dog. It idles OK but upon tip in throttle it skips badly and backfires through the exhaust. Full acceleration it revs OK as well. Its a renix system and I changed a whole bunch of stuff to eliminate components. The stuff I changed are throttle body, cause the tips shows a part throttle at 0.27v. Intake air temp, wire broken. Crank sensor, watching it with lab scope it spikes at different times (and not a reference spot). Ignition coil/module, cause I had one so I used it. O2 sensor cause it was dead. Swapped computer and still no change. Fuel pressure is 30 psi Idle and it still acts up with regulator unplugged and 40 psi. Besides the Skip is too fast for fuel so thats why I'm concentrating on fire. At idle the spark will jump an Inch with blue spark, when its backfiring and running rough the spark will hardly jump 1/8 - 1/4 Inch this I think is not normal and might be a problem ? and its the same with the other swapped coil/module. plugs are new. Any suggestions and help is needed as for all this work done so far is for nothing.
The Cherokee works like a dog. It idles OK but upon tip in throttle it skips badly and backfires through the exhaust. Full acceleration it revs OK as well. Its a renix system and I changed a whole bunch of stuff to eliminate components. The stuff I changed are throttle body, cause the tips shows a part throttle at 0.27v. Intake air temp, wire broken. Crank sensor, watching it with lab scope it spikes at different times (and not a reference spot). Ignition coil/module, cause I had one so I used it. O2 sensor cause it was dead. Swapped computer and still no change. Fuel pressure is 30 psi Idle and it still acts up with regulator unplugged and 40 psi. Besides the Skip is too fast for fuel so thats why I'm concentrating on fire. At idle the spark will jump an Inch with blue spark, when its backfiring and running rough the spark will hardly jump 1/8 - 1/4 Inch this I think is not normal and might be a problem ? and its the same with the other swapped coil/module. plugs are new. Any suggestions and help is needed as for all this work done so far is for nothing.