[junkzj]

ok guys help me out here, 93 gc 4.0 when starting the jeep of a morning it will crank and crank until the battery is dead, the only way you can get it to start is to turn the key to the run position and let it sit for anywhere from 5 to 30 seconds. i have noticed that if you just jump in and start cranking it wont start. if you turn the key on and wait for the check engine light to come on and then go off it will fire right up. then and only then it will start, i can't figure out why it doesn't come on as soon as the key is turned on. almost like waiting for a diesel to warm up the glow plugs. I also noticed that as soon as the check engine light comes on there is a buzzing sound that only lasts for a second coming from under the hood. there are no codes stored, and it runs fine once it starts. :???:

 

[junkzj]

the auto shutdown has crossed my mind, Im gonna check that as soon as I can get someone inside to watch the check engine light while i try some stuff under the hood. also thought about the computer getting ready to take a dump, gonna check first before I start spending $$. I'll let you know who's right when I figure it out. this jeep used to be a v8 and I swapped in a 4.0 from my old jeep that I rolled, and it never did this. it started after I did the swap.so that leads me to think that I screwed something up in the process.

 

[junkzj]

alright, finally got a code out of it, and only got it once, code 54, this leads me to believe its a crank sensor from what I've read, it is getting worse. taking longer for the light to come on after you shut it off. took about 15 minutes last time I tried, as long as you don't leave it shut off for more than 10 minutes at a time, its not an issue, but I can't run out and start it every 10 minutes! let me know what you all think.tested the auto shutdown relay.... not it. crank sensor, pcm, or???? :???:

 

[junkzj]

alright borrowed a coil, distributor, and crank sensor from a buddy tried all of them, nothing worked....so its looking like the computer. found out that it also won't kick the fuel pump on until check engine light comes on, along with the lack of ignition. I'm pretty sure I've covered all the bases.found out clicking/ buzzing sound is coming from the computer along with a high pitched squeal kind of like when you turn on a tv. [smilie=censored.gif]

 

[junkzj]

it cleared itself, it only showed up once out of the ten times I checked the codes.

 

[junkzj]

and the problem was............................computer. borrowed one from a buddy and it fired right up, thanks for all the help, now everybody can ease up on nic_n_ii. luckily I have lots of buddies with cherokees and parts cherokees and I didn't actually have to buy anything, just had to spend time on it. but thanks again for all the suggestions [smilie=bowdown.gif]