Help... 94 YJ 4.0 won't turn over -
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post #1 of 6 Old 05-07-2002, 08:25 AM Thread Starter
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Help... 94 YJ 4.0 won't turn over

... and now I am stuck driving my younger brother's Geo until I get it fixed

It decided not to start one morning OOTB. It hadn't had a thorough tune up since I bought it from a dealer 30k miles ago, so I replaced the plugs, wires, etc.. While I was at it, I noticed the ignition coil looked two-shades of OEM nasty, and since it is two bolts and $28, I replaced it too (might as well, right?).

Still didn't turn over.

I checked the battery-- ~12.xx volts. No problem. Spot checked spark off of the #1 plug. Zap. Next I checked the fuel pressure-- almost none. Ah-hah! I started thinking the fuel pump, maybe the fuel filter. I replaced both (the latter was full of mud, so it was probably due anyway). At this point, I was pretty surprised that it still didn't turn over. To make sure the pump worked, I bypassed the relay-- it sings like a bird. Out of curiosity, I checked the old pump. It is a little weak, but it runs when it gets juice. Oh well.

I talked to the Jeep dealership, and they said that it is probably not the PCM, since they never go out-- but he couldn't explain why I can't get the check engine lights when I kick it over (so I also can't get the diagnostics code). He tried to tell me it was the ignition coil (still). While I hope it is not the PCM (since he told me it would be $600.00 for a new one), I really want my Jeep to run again... Also, I have no problem admitting that I am not a professional mechanic. If I am being stupid, that is probably because I am <img border="0" title="" alt="[Wink]" src="wink.gif" />

Anybody have any thoughts what it might be that keeps my Jeep from turning over?
1994 YJ
4.0 MPI
Borla Catback, hi-flo catalytic converter, 2" body lift, Bestop seats, Edelbrock shocks, etc., etc.
New: drive line (winter 2001),
transfer case (winter 2001),
plugs, wires, coil,
fuel filter, fuel pump

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post #2 of 6 Old 05-07-2002, 09:09 AM
Dan's YJ
Join Date: Feb 2002
Location: Lompoc Calif
Posts: 233
When you say it won't turn over, do you mean it does NOTHING? Or does it crank over and not start?

1994 Bronco HD
Warn 8000
2"lift, 32x12.50
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post #3 of 6 Old 05-07-2002, 09:27 AM Thread Starter
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It cranks, but does not start...
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post #4 of 6 Old 05-07-2002, 10:59 AM
Dan's YJ
Join Date: Feb 2002
Location: Lompoc Calif
Posts: 233
Okay, I know you need compr., fuel, and spark to make an engine fire. And they all have to take place at a set time in order for everything to work.

We know you have spark, you said you checked that. We know you have fuel, you also checked. How's your compr.?

If you have good compr. I don't know what to tell ya. It's either your timing (your computer) or your FI system.

1994 Bronco HD
Warn 8000
2"lift, 32x12.50
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post #5 of 6 Old 05-07-2002, 09:21 PM
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Join Date: Jul 2001
Location: deep in the heart of texas
Posts: 286
have you tried a crank position sensor?it won't let it start if it is are kinda in pickle if it doesn't write error might be worth it to take it to the local jeep dealer and have them do a diagnostic.even with no codes they ougt to be able to figure it out.the bad thing with just randomly replacing crap is that it gets expensive VERY quickly.sometimes it's just better to cough up the money to have someone look at it if you can't figure it out on your own.i found this one out the hard way...

95 yj...
who ever said putting a spool in a daily driver was a bad idea was just jealous he had not tried it first...
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post #6 of 6 Old 05-08-2002, 05:45 PM
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Location: Orland, IN
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Does it make any difference what the outside temperature is? If it does, try this. Turn the key to the on position and leave it there until you hear the relay clicking. Then wait until the "shift arrow" shows on the dash display. Wait a few more seconds, and then start. May have to play with the accelerator a little at first. When it is much below 32 degrees, this process might take almost 5 minutes. The warmer the temp. the less time it takes. Regular summer time doesn't effect it at all. I have yet to find the cause.
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