TK99XJ
NAXJA Forum User
- Location
- Los Angeles, CA
Here is the rundown…
1999 4.0, auto 4x4; The no start condition is VERY intermittent in that it will not happen for weeks and then out of nowhere it will not start. When it does happen, it will do so for a couple of days on and off and then it will “fix” itself for another few weeks before coming back.
She will crank over but not fire. I have so far checked all grounds, the fuses, the relays and the large “BUS” connectors under the dash to the best of my abilities and all are in excellent condition and clean. I have removed, cleaned and reinstalled the gauge pod as I was getting the intermittent gauge issue that is common on the late model Cherokee’s and that had no affect on the condition. I have run a scanner on the PCM and there are no codes showing/recorded. I have cleaned and re-installed the NSS and I am 100% certain that is not it. I am also of the thinking that the CPS is not the problem either and here’s why…
Last night the condition arose yet again and after about 10 to 15 tries I got pissed and did the unthinkable, I smacked the Jeep pretty hard on the steering wheel and called her a bad name. I tried her one more time after that and she started right up!
Now that right there means to me that something is loose either under the dash or on/in the steering column. I removed the surround on the steering column just behind the wheel and all looks ok, cleaned the terminals on the ignition switch and clock spring with no change after the condition arose for a second time. After another 20 tries with no luck, one more good smack and she started up yet again.!?!
The fuel pump comes on every time, rises to the correct pressure and cuts until fired and when she is running, she is smooth with no stutter thus… I am guessing that the fuel pressure is up to par as well. I know that the PCM shuts off the fuel system if it does not fire after 3 seconds, so based on fuel under pressure in the rail I can only assume that it is in fact getting fuel at the correct pressure as I do not have a fuel pressure gauge. I have checked for spark and this is where things get interesting… I have no spark when the condition arises. Since a no spark condition leads me back to the CPS I am starting to think that possibly that is the issue here but the name calling and banging of the steering wheel makes me think otherwise!?!
What am I missing here? Thoughts/suggestions are GREATLY appreciated!
1999 4.0, auto 4x4; The no start condition is VERY intermittent in that it will not happen for weeks and then out of nowhere it will not start. When it does happen, it will do so for a couple of days on and off and then it will “fix” itself for another few weeks before coming back.
She will crank over but not fire. I have so far checked all grounds, the fuses, the relays and the large “BUS” connectors under the dash to the best of my abilities and all are in excellent condition and clean. I have removed, cleaned and reinstalled the gauge pod as I was getting the intermittent gauge issue that is common on the late model Cherokee’s and that had no affect on the condition. I have run a scanner on the PCM and there are no codes showing/recorded. I have cleaned and re-installed the NSS and I am 100% certain that is not it. I am also of the thinking that the CPS is not the problem either and here’s why…
Last night the condition arose yet again and after about 10 to 15 tries I got pissed and did the unthinkable, I smacked the Jeep pretty hard on the steering wheel and called her a bad name. I tried her one more time after that and she started right up!
Now that right there means to me that something is loose either under the dash or on/in the steering column. I removed the surround on the steering column just behind the wheel and all looks ok, cleaned the terminals on the ignition switch and clock spring with no change after the condition arose for a second time. After another 20 tries with no luck, one more good smack and she started up yet again.!?!
The fuel pump comes on every time, rises to the correct pressure and cuts until fired and when she is running, she is smooth with no stutter thus… I am guessing that the fuel pressure is up to par as well. I know that the PCM shuts off the fuel system if it does not fire after 3 seconds, so based on fuel under pressure in the rail I can only assume that it is in fact getting fuel at the correct pressure as I do not have a fuel pressure gauge. I have checked for spark and this is where things get interesting… I have no spark when the condition arises. Since a no spark condition leads me back to the CPS I am starting to think that possibly that is the issue here but the name calling and banging of the steering wheel makes me think otherwise!?!
What am I missing here? Thoughts/suggestions are GREATLY appreciated!