Starting Problems - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 05-18-2008, 12:52 PM
Thread Starter
Join Date: May 2008
Posts: 1
BLACK WRANGLER is on a distinguished road
Starting Problems

I have a 91 Jeep Wrangler (4.0). I was moving slowly in 4wd and the motor quit. I tried to restart, but the starter engages but does not start. It's like its starving for fuel.

-I checked the fuel rail by depressing the valve stem and it sprayed fuel.
-I checked the coil, it has spark.
-I checked the engine codes and it showed 42, which is 1)automatic shutdown relay circuit, 2)fuel pump relay circuit, 3)fuel level unit, 4)z1 voltage missing when autoshutdown circuit energized.
-I poured a little gas in the throttle body and it wanted to start but didn't
-I do not hear the fuel pump running with the key switched
-I then checked power out of the fuel relay circuit and have no power. I switched relays with known good and still did not have power. I disconnected the fuel pump at the tank, jumpered the relay, and have power. But then when I connect the fuel pump back at the tank, the fuel pump does not come on and then I hear the automatic shutdown relay click.
-I did hook 12v straight to the fuel pump and it came on.

Anyone have any ideas? Could it be my fuel pump is indeed bad and drawing too many amps or something in this automatic shutdown circuit?

Thanks for any help!
BLACK WRANGLER is offline   Quote
Old 05-18-2008, 04:28 PM   #2
jpdocdave's Avatar
Join Date: Mar 2008
Location: beach park, il
Posts: 8,162
jpdocdave is on a distinguished road
fun one. i doubt pump is bad, if you give it power and it runs the pump, then its good. some reason pump isn't getting power, and obvioiusly not relay. i can't remember if there's a fuse or not. checkem all anyway.

maybe check a wiring diagram for where pump is getting power along the way. good luck and let us know

oh yeah, welcome to wf.
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency. It will be far easier to limit and undo the follies of an Obama presidency than to restore the necessary common sense and good judgment to a depraved electorate willing to have such a man for their president."
jpdocdave is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
My Clutch Problems and How I Resolved Them linz TJ Tech Forum 7 08-30-2014 06:36 AM
how to fix all vacume problems and how to locate the problems. Captaincoop1220 YJ Tech Forum 50 02-23-2013 12:19 PM
Starting problems gamecock22 TJ Tech Forum 3 09-27-2006 08:38 PM
Starting problems Micknber TJ Tech Forum 2 03-26-2006 03:15 PM

All times are GMT -5. The time now is 12:53 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner