91 YJ 4.0 No Fire, No Fuel - Jeep Wrangler Forum
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Old 06-08-2008, 07:48 PM   #1
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91 YJ 4.0 No Fire, No Fuel

ok so here's the deal....... i stopped on my way to work and shut off my yj. filled it with gas, hopped back in, no start....... crank, no start....... no spark, no fuel, nothing.......... replaced the coil, all distributor components, and believe i've traced it back to the computer...... took the computer in to autozone and they're shipping it off to their R&R company to rebuild it or replace it..... anyone have any other ideas as to what it could be....... im not sure if the 91 has an ignition module that could be faulty...... if it has one..... i can't find it...... i drive tow truck and have seen this before but usually it's just a bad coil or a relay...... i've checked all the relays, all the fuses, everything i can think of back to the computer and im getting no power there....... i have inside lights........ and the jeep will crank over even without the computer in it........ dash lights all work..... my OBD reader didn't even power on when i plugged it into the port....... so im pretty sure that the computer is fried..... when i pulled it out.... looked inside..... the board inside was black and cracked and just looked decimated....... so im pretty sure that's what it was...... if anyone else has anything that i might need to check out feel free to hit me up!!! thanks

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Old 06-08-2008, 09:53 PM   #2
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probaby it, crank sensor can cause same symptoms also.

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Old 06-08-2008, 09:56 PM   #3
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yeah i replaced that as well......
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91 YJ 4.0

33x12.5x15 XTERRAINS
Warn 9.5 TI Winch
4" Suspension lift
SOA install coming soon

WWW.SGARLATO.COM

San Jose CA

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Old 06-08-2008, 11:46 PM   #4
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if the board was cracked, i'd guess you found the problem. but dont take my word
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Old 06-09-2008, 02:16 AM   #5
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well i guess we'll find out when i get the ECM back next tuesday..... if that doesnt do it im not sure what the hell is wrong....... but hopefully that does it......
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91 YJ 4.0

33x12.5x15 XTERRAINS
Warn 9.5 TI Winch
4" Suspension lift
SOA install coming soon

WWW.SGARLATO.COM

San Jose CA

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Old 06-09-2008, 09:39 AM   #6
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What about the not-so-obvious ignition switch?
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Old 06-09-2008, 09:54 AM   #7
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usually if warning light check comes on dash with key on, switch is good. usually.
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Old 06-16-2008, 04:45 PM   #8
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WELL GREAT...... got my ECM back from CARDONE rebuilders and needless to say..... they didnt do a thing to the unit, never called me to tell me they couldnt rebuild it AND they don't have it, NOR CAN THEY GET ONE!!!!!...... so all this fun stuff and jumping through hoops for a week and a half now for absolutely nothing...... although i DID get my 265.20 back,....... so boys and girls, if you go somewhere to have something rebuilt on your YJ, and they tell you that they're gonna ship it off to CARDONE......... tell em to forget it....... they're wasting your time and money as well for nothing
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Rick Caudill

91 YJ 4.0

33x12.5x15 XTERRAINS
Warn 9.5 TI Winch
4" Suspension lift
SOA install coming soon

WWW.SGARLATO.COM

San Jose CA

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Old 06-30-2008, 09:27 PM   #9
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well i finally got the right part from an online auto parts exchange rebuilder....... put it in..... FIRED RIGHT UP!!!! let me know if you guys have any problems with yours and i'll get you the number for them. they stock all yj computers (i asked) and have referred a couple people to them already for computers

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Rick Caudill

91 YJ 4.0

33x12.5x15 XTERRAINS
Warn 9.5 TI Winch
4" Suspension lift
SOA install coming soon

WWW.SGARLATO.COM

San Jose CA

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