I have a 97" XJ with a 4.0. I currently have the code telling me I have a cylinder 1 misfire. The CEL is on. I have tried 27 different things to fix it and a friend of mine who is a Jeep Mechanic and Engine builder has helped me too. I have 15 hours in the car trying to fix it with no avail. Here is a list of what we have done to try to fix the partial misfire.
New Distributer Cap, New rotor, New plugs, new spark plug wires, re-phased the distributer, Compression test (120-150), Leakdown test (at TDC & BDC), New fuel injector, Noid light test, checked for intake leaks, Put seafoam in the gas tank, changed the injector harness connector, New ECU, cleaned ECU terminals and put dialectric grease on harness plugs, fuel pressure is 49.3, checked the timing, OBD 2 scanned with Chrysler scanner, rocker arm and spring check, checked the squarewaves on the CPS, changed the CPS, changed the Camshaft position sensor, inspected with a camera down through the spark plug hole for cylinder wall damage, inspected the intake manifold with a camera for obstructions, new throttle body and sensors, check the voltage on the fuel injectors. Doesn't look like the cam is flat. Any thoughts? Your help would be GREATLY appreciated.
New Distributer Cap, New rotor, New plugs, new spark plug wires, re-phased the distributer, Compression test (120-150), Leakdown test (at TDC & BDC), New fuel injector, Noid light test, checked for intake leaks, Put seafoam in the gas tank, changed the injector harness connector, New ECU, cleaned ECU terminals and put dialectric grease on harness plugs, fuel pressure is 49.3, checked the timing, OBD 2 scanned with Chrysler scanner, rocker arm and spring check, checked the squarewaves on the CPS, changed the CPS, changed the Camshaft position sensor, inspected with a camera down through the spark plug hole for cylinder wall damage, inspected the intake manifold with a camera for obstructions, new throttle body and sensors, check the voltage on the fuel injectors. Doesn't look like the cam is flat. Any thoughts? Your help would be GREATLY appreciated.