eastcoastclimber
10-21-2014, 03:51 PM
Hello Everyone,
Hoping some of you guys can help me figure out my starting issue. She's a 98 4.0, auto. I bought this XJ about 4 months ago. It always starts but would have to mess with Shifter in park position so I removed/cleaned NSS also fuel gauge didn't work consistently, so I replaced fuel pump and found the old filter inside the bottom of the tank. Fuel gauge works now and NSS looks like new. I also removed injectors and gave them a good cleaning, cleaned IAC and TB, new plugs, wires, coil. Also cleaned/re-greased starter as well as all wires to/from battery/coil.
It did throw a code po455, but engine light has been off for some time now. Vacuum lines up top look good. It did come on when I unhooked my CPS, which I still think could be the problem, but other than that CEL has been off. It will start right up when its hot, but cold will need a good 3 sec crank than let off key then crank again and it fires up. I checked fuel pressure at the rail and it read 10 psi on first prime, and 30 psi on second prime and idled at steady 50psi. After shutting off engine it died down to 10psi within 3 seconds and then slowly drained to about 5psi within 5 secs after shutting off engine.
Not sure if this is fuel related, or could be old/worn Crank Pos Sensor which I've been reading alot of threads about. But it never stalls, and always starts. No CEL currently on. It does idle a little rough, but tach doesn't dip down. Just has this slight shutter every 3 seconds. Acceleration is good.
Thanks,
ECC
Hoping some of you guys can help me figure out my starting issue. She's a 98 4.0, auto. I bought this XJ about 4 months ago. It always starts but would have to mess with Shifter in park position so I removed/cleaned NSS also fuel gauge didn't work consistently, so I replaced fuel pump and found the old filter inside the bottom of the tank. Fuel gauge works now and NSS looks like new. I also removed injectors and gave them a good cleaning, cleaned IAC and TB, new plugs, wires, coil. Also cleaned/re-greased starter as well as all wires to/from battery/coil.
It did throw a code po455, but engine light has been off for some time now. Vacuum lines up top look good. It did come on when I unhooked my CPS, which I still think could be the problem, but other than that CEL has been off. It will start right up when its hot, but cold will need a good 3 sec crank than let off key then crank again and it fires up. I checked fuel pressure at the rail and it read 10 psi on first prime, and 30 psi on second prime and idled at steady 50psi. After shutting off engine it died down to 10psi within 3 seconds and then slowly drained to about 5psi within 5 secs after shutting off engine.
Not sure if this is fuel related, or could be old/worn Crank Pos Sensor which I've been reading alot of threads about. But it never stalls, and always starts. No CEL currently on. It does idle a little rough, but tach doesn't dip down. Just has this slight shutter every 3 seconds. Acceleration is good.
Thanks,
ECC