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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Well, I am probably over thinking this but I'm pretty much at a wall and want to beat my head against it. 1990 Cherokee, ran great. Installed bumpers and a winch. Pulled it out of the shop. The next day, I Installed my swingouts, had to pull it forward so went to start it. I let off the starter too soon and it didn't quite fire over. And that's where it died.
So far I have replaced the CKP, coil, plugs, wires, cap, rotor, fuel filter, and repaired a bad ground at the dipstick. I have good spark, .6 volts from the CKP when cranking, and 35 psi fuel pressure when cranking. I cleaned the nastiness out of the main harness at the firewall plug. It smells rich while cranking so I know fuel is getting where it should. Distributor is clocked correctly. Checked all the major connections for corrosion. Jeep is very rust free so I am lucky there.
I have no clue what the PO has done to it, but there is a suspicious amount of extra wires and plugs in the engine bay. I do know that the ABS was deleted. If anyone (cruiser) has some insight on where to go next, I'd really appreciate it. Thank you ahead of time.
I did break that little guy while checking the CKP, but replaced the cracked section with rubber vacuum hose. I will look it over more closely when I get home and update you then.
Sorry for the late reply, it's been hectic at work. The vacuum line to the MAP looks good. No other cracks in it. It's insane that I have good voltage from the CKP, spark and fuel, is there some other renix witchcraft that I'm missing that would keep it from starting?
No dice with my foot on the floor, cranked it for about 45 seconds. It smells really rich from the engine bay. I deleted the CKP connector and hard wired it. Tomorrow I plan on pinning out the connector to the ecm to see if I'm getting the .6 volts from the CKP at the ECM because the way she died really points to the CKP.
Interesting, I thought it didn't allow spark unless it received the signal from the CKP. I need to get a noid light set and make sure my injectors are firing. I've always had spark. But I've just assumed the I have fuel because if the rich smell. I'll let you know what I find
Something I sometimes do to disable my jeep is slightly unplug the crankshaft position sensor connector, leaving the plastic connectors together but not letting the metal contacts touch. This creates a situation where the XJ will crank indefinitely and not ever fire. If the CPS is out of the bell housing, it won't even try to crank. Interesting issue that can happen, definitely a possibility if you've been really messing with the harness.
So I'll throw in my experience with a crank & no start in hopes that it may help. (on a 98, not Renix) it ended up tracing back to, of all things, the ECT sensor decided to just quit on me and was reading way negative engine temps. This caused it to be super rich when trying to start, reeked of fuel, cranked strong, but it would only start if I held the throttle to the floor and even then would generally die back out bc it was so rich.
So while not exactly the same, worth noting to double check anything you might have unplugged or disturbed while it was in the garage, see if you can verify the temp sensor readings. Something like that may have decided to quit on you. This had me losing sleep for a while until I figured it out.
So I'll throw in my experience with a crank & no start in hopes that it may help. (on a 98, not Renix) it ended up tracing back to, of all things, the ECT sensor decided to just quit on me and was reading way negative engine temps. This caused it to be super rich when trying to start, reeked of fuel, cranked strong, but it would only start if I held the throttle to the floor and even then would generally die back out bc it was so rich.
So while not exactly the same, worth noting to double check anything you might have unplugged or disturbed while it was in the garage, see if you can verify the temp sensor readings. Something like that may have decided to quit on you. This had me losing sleep for a while until I figured it out.
Best of luck.
solid advice dude, i will do that, I hope I'm just missing something because I'm over thinking it
it's all good bro, I wish I would have got a 4.0 HO. I sold my TJ that had a power tech in it because it wasn't comfortable with an infant. Miss that power tech though
10-18-2023, 11:27 PM
The old crank no start
