Hi all, new member here. I recently bought a XJ with a bad fuel pump that would turn over but not start. After changing the fuel pump, it would backfire from the throttle body but not start. Only code was for the cam sensor. I disconnected the exhaust downpipe and I can visibly see fire shoot out from the exhaust manifold when cranking (disconnected because I thought it could be a clogged cat)
Changed the following parts:
-New battery
-Fuel Pump
-ASD relay
-All 6 spark plugs
-Crankshaft position sensor. TWICE after hearing its a common issue
-Distributor (due to cam position sensor code), cap & rotor
-Starter (previous starter was weak to crank)
-PCM/ECU whatever its called. Junk yard part from different year Jeep 4x4 (mine is 2WD)
-New ignition cylinder
Tested:
-Fuel pump primes and pumps just file. Fuel at Schrader valve
-Battery steady 12.4 volts
-Tested spark on each cylinder and at the distributor. All test good
-No codes/CEL (after fixing the 1 I had)
-Checked for vacuum leaks at the intake manifold (using smoke through the throttle body) and could not find any
-Tested all the ground I can find. Cleaned and tested good
I havent tested for compression or engine timing yet. I did notice oil on the spark plugs when i changed them. My thoughts is either bad PCM, blown head gasket, or stuck valve, but im really not sure at this point.
Does anyone have suggestions?? Thanks in advance!!
Changed the following parts:
-New battery
-Fuel Pump
-ASD relay
-All 6 spark plugs
-Crankshaft position sensor. TWICE after hearing its a common issue
-Distributor (due to cam position sensor code), cap & rotor
-Starter (previous starter was weak to crank)
-PCM/ECU whatever its called. Junk yard part from different year Jeep 4x4 (mine is 2WD)
-New ignition cylinder
Tested:
-Fuel pump primes and pumps just file. Fuel at Schrader valve
-Battery steady 12.4 volts
-Tested spark on each cylinder and at the distributor. All test good
-No codes/CEL (after fixing the 1 I had)
-Checked for vacuum leaks at the intake manifold (using smoke through the throttle body) and could not find any
-Tested all the ground I can find. Cleaned and tested good
I havent tested for compression or engine timing yet. I did notice oil on the spark plugs when i changed them. My thoughts is either bad PCM, blown head gasket, or stuck valve, but im really not sure at this point.
Does anyone have suggestions?? Thanks in advance!!