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Old 04-25-2012, 12:47 PM   #31
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Ok thank you. I suspect its a wire/fuse issue, as this has been coming and going in the last month or so. I will be sure to check all connecting pins at the ECM.

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Old 04-25-2012, 06:58 PM   #32
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Did you see this thread posted today?

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Old 04-25-2012, 08:47 PM   #33
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Thanks, I'll swap them all out It'll just be a couple bucks. In comparison to what I've been through it's nothing. By the way thanks for hanging with me on this
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Old 04-25-2012, 09:07 PM   #34
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Been there, done that...it's got to be something simple
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Old 04-25-2012, 09:08 PM   #35
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Thanks for the encouragement
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Old 04-26-2012, 07:24 PM   #36
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Well fuses didn't do it..... guess i'll be tracking wires down this weekend???
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Old 04-26-2012, 08:26 PM   #37
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I just replaced the pcm in my 90 2.5 yj and now won't turn off without unplugging the fuel pump relay
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Old 04-26-2012, 08:58 PM   #38
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Quote:
Originally Posted by Mark Tice View Post
..... guess i'll be tracking wires down this weekend???
If it was me...I'd start by dumping some fuel in the TB and making sure it will fire and run. If it doesn't fire you could still have a CPS or ECM issue that's not allowing power to be sent to the pump.

If it fires I'd check the power circuit first. It's tough to check the 2-second blip when the key goes to "run" so it might be easier to take the feed off the starter and have someone hold the key in "start" where it should be getting continuous power to the harness connection for the pump. No power... start tracing all the way back through the relay to the ignition.

If you have power you should be able to ground the pump to the frame, right off the pump harness, effectively bypassing any ground that runs up to the engine compartment.
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Old 04-30-2012, 11:04 AM   #39
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Monday bump...any luck?
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Old 04-30-2012, 02:47 PM   #40
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The ecm Is not sending power to the pump. Going to try to dig through the harness a little more tonight. The ground has been scrubbed clean And the new connector put on the end of the wire. Bump? I feel like this thing is running me over
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Old 04-30-2012, 08:23 PM   #41
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Well I did some checking tonight, I have continuity all the way to the fuel pump. I have a good ground all the way to the fuel pump. When the key is turned to run or start the orange wire coming off the relay has no power. According to the wiring diagram this is the leg that carries power to fuel pump. Good grounds, good continuity, good fuses, good relay, good fuel pump... bad computer?
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Old 04-30-2012, 08:44 PM   #42
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I can hardly believe that a bran new computer is junk.....
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Old 04-30-2012, 08:55 PM   #43
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Trace the wire that goes to the fuel pump make sure u dont have a cut wire if u do any type off roadin and run a wire to the pump from the battery as a test wire i have a 91 and when i got my jeep someone ran a wire right from the fuses under the hood to the pump
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Old 04-30-2012, 09:01 PM   #44
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I have continuity from the fuse box to the fuel pump, checked with a meter. Good thought though
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Old 04-30-2012, 09:39 PM   #45
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Take the fuse out and run a 12V jumper to the load side of the fuse. If the pump starts you have an ECM or ignition switch issue.

Any warranty on the refurb ECM? They should at least be able to tell you which pin is fuel pump (if you haven't already found that info).
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Old 04-30-2012, 09:49 PM   #46
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I had the same problem and had to bridge a fuse on the relay and change out my ignition switch....some of the electrical on a 90 has to be cleaned up and modified slightly to work without constant issues
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Old 05-04-2012, 01:19 PM   #47
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And the plot thickened this week, thru s series of events and phone calls I find out that my refurbed ECM is not mine at all, for 2 weeks i have been working around and trying to make something work that isn't supposed to even be in me jeep! My computer is in the great state of PA waiting for auto zone to get their ducks in a row and in the unlikely event they do get it straight im going to put some mud in the tires this weekend!
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Old 05-04-2012, 02:53 PM   #48
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Do you suppose there's another guy out there somewhere with your computer pulling his hair out trying to get his Jeep to run
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Old 05-09-2012, 04:44 PM   #49
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Well I got my computer back today,(after waiting far too long) Put it in and cranked up It would only idol really rough When I held my foot on the gas. Fuel pump is working properly I don't know other than the new distributor cap might be bad?
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Old 05-09-2012, 07:29 PM   #50
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You're getting closer!

Sounds like your timing is off. Did you replace the timing gears or have the distributor out?
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Old 05-09-2012, 07:38 PM   #51
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Yes I replace the timing gears & chains to reset the timing you have to pull the distributor, I don't see any way to adjust it. There is a possibility I didn't have the gears right
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Old 05-09-2012, 08:16 PM   #52
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Sounds like the distributor is off by a tooth. Number 1 piston at TDC on the compression stroke and rotor just approaching #1 position and you should be golden. If you were 180 degrees off (at #1 position on the exhaust stroke) it wouldn't start at all.
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Old 05-09-2012, 08:16 PM   #53
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Or that i have the distributer one or two teeth off
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Old 05-10-2012, 07:31 PM   #54
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Moving the distributer 1 tooth Got it to idol, But not run like it should. Think I'm gonna have to go back to the chain and check it from there
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Old 05-10-2012, 07:58 PM   #55
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Hi new guy to the forum reading proble and responses
When installing the new ECM it's possible one of the pins
May have folded over breaking off also those old
Chrysler product elect connectors are notorious for
The pins slipping inside the housing causing poor or
No contact I its a pain but it's better to double check
and double check again you may find something
U over looked before good luck!!
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Old 05-10-2012, 08:39 PM   #56
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I will take a look. Thanks & welcome to the forum!
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Old 05-11-2012, 10:18 AM   #57
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It lives!!!! Autozone call again this morning and notified me I still had the wrong computer. Went and got mine, as soon as I plugged it up she started right up!
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Old 05-11-2012, 10:58 AM   #58
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Good job sticking with it instead of shooting it

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Old 05-11-2012, 11:40 AM   #59
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I was locked and loaded, Even had a cliff picked out
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Old 05-11-2012, 11:41 AM   #60
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I think I am going to paint under the hood " It's a yj Get use to working on it"

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