1993 JGC Check Engine light not flashing codes

[Jeep-Nut]

My 93 JGC was running fine and then suddenly quite and the check engine light came on. I have fuel pressure and it turns over fine, but am not getting any fire out of the ignition coil. Replace the coil and still no spark. I check the computer codes using the check engine light methode and when I cycle the key three times the light never starts flashing codes.....could this be a computer failure?

[Dale Aeppli]

Originally Posted by Jeep-Nut

My 93 JGC was running fine and then suddenly quite and the check engine light came on. I have fuel pressure and it turns over fine, but am not getting any fire out of the ignition coil. Replace the coil and still no spark. I check the computer codes using the check engine light methode and when I cycle the key three times the light never starts flashing codes.....could this be a computer failure?

Hi, When you first turn the key on does the check light come on right away. Dale [email protected]

[MattFelner]

Remember, cycle the key on and off three times in succesion. I'm almost positive you have the analog odometer, in which case your light should blink. If this fails, a DRB tool is necessary.


HTH!
Matt

[Jeep-Nut]

I do have the analoge odometer and the light comes on right away and never flashes. I have tried the three times in succession cycle several times and the light never flashes.

[gunjes]

Coil Wire spark and resistance check? Any voltage going to the coil with key in the run position?

[MattFelner]

Sorry, I goofed.

Your '93 is NOT OBDII compliant.

[Jeep-Nut]

I tried a new wire from the coil to the distributor, still no fire. And I put a known good coil on with no improvement. How much voltage should I get to the coil with the key in the run position?

I am still very suspicious of the computer since it is not behaving correctly with regards to flashing fault codes.

I had to have it towed so I went a head and took it to my local Jeep Dealer, we willl see what they come up with on Monday. Any ideas are still appreciated. Thanks. Jeep-Nut

[Jeep-Nut]

I got the Jeep back from the dealer and they found a 30 amp "Maxi-Fuse" blown in the power distribution center under the hood. The fuse in question was the one for the Computer.....so I was on the right track suspecting the computer, but am much relieved that it was a $2.00 fuse instead of a $500.00 computer. Thanks for the suggestions.
Forest