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View Full Version : 4.0 cranking but not starting


84xjmafia01
02-02-2014, 04:25 PM
Alright so i installed a 4.0 i bought off craigslist into my 98 xj a couple weeks ago and since have been chasing the problem that it simply wont start. Everything (to my knowledge) is hooked up correctly. I have not reinstalled the drive belt or radiator yet though. But the motor is getting fuel and spark. When it cranks over it pops in the intake, so i assume the timing is off. SOOOO i went through the procedure of correcting the timing, turned the oil pump to the 10o'clock position (cyl 1 TDC) reinstalled the distributor with the rotor at the 5o'clock position and it seems to pop more than it did before. any suggestions on what my next step should be?? :bang:
Brasscatz
02-02-2014, 04:59 PM
I'd get in there with a timing light to check for timing accuracy. Also, is it giving you any check engine codes?
84xjmafia01
02-02-2014, 05:02 PM
No codes are popping up. Would i be able to use a timing light by just cranking it since it wont start?
Brasscatz
02-02-2014, 05:07 PM
You should be able to. Now, one of the most common issues with these XJ's is the CPS going bad. Might see if a new one solves your problem
84xjmafia01
02-02-2014, 05:20 PM
Well if it was the CPS i wouldnt be getting spark at all.
Brasscatz
02-02-2014, 05:49 PM
Have you tried spraying starter fluid in the intake? Might help narrow down your issue
84xjmafia01
02-02-2014, 05:54 PM
I havent. Im going to check the compression tomorrow. after i do that ill spray some starting fluid in there. Maybe thatll help it fire at least once
slvmart
02-02-2014, 06:18 PM
Sorry posted in wrong topic.
4.3LXJ
02-02-2014, 08:37 PM
No codes are popping up. Would i be able to use a timing light by just cranking it since it wont start?

yes, it will work fine that way, but you need to keep a sharp eye out. Mark the spot with white first
denverd1
02-05-2014, 10:24 AM
sounds like you're 180* off. From what I remember, you index the pump and dizzy to the same spot...
84xjmafia01
02-10-2014, 06:01 PM
Well i finally got out to check it out and it was 180 degrees off. Now its finally up and running! But I had a buddy install my injectors and one leaks so i have to check those out next chance I get. Thanks everyone for the tips and advise! :beer: