engine won't start after getting warmed up and sitting. - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-07-2012, 12:44 PM   #1
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
engine won't start after getting warmed up and sitting.

So I've been working on my '89 wrangler for over 4 months now. The $850 I spent on it has turned into a lot more!

I just have one final problem to fix, so I'm hoping I can get this figured out soon and make this Jeep my daily driver.

Anyways, I thought between everything I did, it was perfect. It ran great and everything. Only problem, after driving it for a little while, I put gas in, and it wouldn't start back up, got stuck at the gas pump for 10 minutes before getting some help pop starting it. That was 3 days ago. Fast Forward to today, I have a new starter, yet last night I got stuck as the gas station again, and at the bowling alley I went to after that.

The first time at the gas station I got it to start by giving it some gas. The second time I had to roll down a hill and pop start it. What a pain!

It turns over fine, and if you give it gas it will try to start, but usually not follow through. It's a 2.5L tbi. If it helps, the dash gas gauge doesn't work, nor does the oil pressure or the temp gauges.

I read something about the fuel pressure regulator? but I also saw a couple of other things it could be. Thanks for the help!

Oh yeah, here's the kicker. I left it sitting when I got home from all of this for about 15 minutes. A little longer than I left it at the gas pump, a little less than at the bowling alley. It started up fine. It seems to not start only where I really want it to start!

TwoPointFiveLiter is offline   Quote
Old 02-07-2012, 03:17 PM   #2
Jeeper
 
Join Date: Jun 2011
Location: n.y.
Posts: 144
i had a similar problem with a 90 4.2, it would die out on me all the time. would fix it or so i thought and it would do it again. anyway turned out to be ignition module. the next time your jeep quits i would check it for spark and go from there. good luck

barjeep is offline   Quote
Old 02-07-2012, 04:14 PM   #3
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Quote:
Originally Posted by barjeep View Post
i had a similar problem with a 90 4.2, it would die out on me all the time. would fix it or so i thought and it would do it again. anyway turned out to be ignition module. the next time your jeep quits i would check it for spark and go from there. good luck
That's the thing. It doesn't die out on me. It stays running as long as I want it to. It's when I decide to turn it off after it's been going for awhile, and then let it sit for a few minutes that it doesn't wanna start.

When it's cold, it's fine. If I turn it off and immediately back on, it's fine. But If it's warmed up and sat for more than like 5 minutes it doesnt wanna start again.
TwoPointFiveLiter is offline   Quote
Old 02-07-2012, 08:48 PM   #4
Jeeper
 
1fast lorinser's Avatar
 
Join Date: Sep 2011
Location: Nyc queens
Posts: 126
Just a thought but check your fuel filter
__________________
"You Only Live Once"
1fast lorinser is offline   Quote
Old 02-07-2012, 10:51 PM   #5
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Quote:
Originally Posted by 1fast lorinser View Post
Just a thought but check your fuel filter
Thanks!, I'll do that tomorrow morning.

My father had an idea. He said that the metal hose thing I have going from the air intake to the exhaust manifold shield to give it preheated air and warm up faster might be causing the problem. I'll check both tomorrow and see if I can make it home after school.
TwoPointFiveLiter is offline   Quote
Old 02-08-2012, 04:24 PM   #6
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
I noticed that when I try to start it for prolonged amount of time, like 30 seconds on and off, but close together, just trying to get it to start. I can get out and listen under the hood to hear what sounds like water kind of pouring onto something, then slowing down to drops, then nothing.

It's gotta be gas, slowly pouring out of somewhere to somewhere else, but I can't hear too well.
TwoPointFiveLiter is offline   Quote
Old 02-08-2012, 06:08 PM   #7
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Another thing.

I just drove it until hot, brought it home and had my father use the timing light on the hot engine. It was very erratic. SOmetimes it would flash twice close together, sometimes just once, sometimes it would go a few seconds with no flash. Didn't seem to have any order at all.

I just wanna drive it and not have to worry about this!
TwoPointFiveLiter is offline   Quote
Old 02-08-2012, 07:29 PM   #8
Jeeper
 
Join Date: Nov 2011
Posts: 717
fuel leakage

I am not familiar with the exact fuel setup on the TBI, but on a carb'ed engine, I would look at the needle and seat as leaking and flooding when hot. Sounds like it might be pressure in the system leaking into the TB and flooding it?
ballistx is offline   Quote
Old 02-08-2012, 08:39 PM   #9
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
I actually checked it with a cold engine. Started right up, took not even 2 seconds. and the timing light was spot on.

But once it gets warm and I turn it off, when I try to turn it back on, it won't go. The timing becomes erratic like mentioned previously.

I read something about the ignition module, but that seems to have an effect while driving, stalling the vehicle. This is only effecting me when trying to start, it runs great.
TwoPointFiveLiter is offline   Quote
Old 02-08-2012, 09:09 PM   #10
Jeeper
 
SandyMushYJ's Avatar
 
Join Date: Nov 2010
Location: Asheville, NC
Posts: 357
Quote:
Originally Posted by ballistx View Post
I am not familiar with the exact fuel setup on the TBI, but on a carb'ed engine, I would look at the needle and seat as leaking and flooding when hot. Sounds like it might be pressure in the system leaking into the TB and flooding it?
OP, I think you should look into this. Do your attempt to start thing until you hear the dripping and look into the throttle body. A leaking fuel injector could flood the intake while the fuel pressure bleeds off, which would also explain why it sometimes starts when you give it throttle while turning it over. Opening the air flow to a flooded engine helps it to start. It could be leaking out of the nozzle or, more likely, at the o-ring around the injector body. you may even be able to duplicate the problem by cycling the key to build fuel pressure without actually starting the engine.
__________________
'95 YJ 2.5L, 5-sp, 2.5" lift, 31" Pro Comp MT's

'62 Willys pickup Super Hurricane L6
Original, disassembled and in slow progress.
SandyMushYJ is offline   Quote
Old 02-09-2012, 10:08 AM   #11
Jeeper
 
crunch's Avatar
 
Join Date: Aug 2010
Location: Bowling Green, Ky
Posts: 253
Images: 9
On mine granted it is a 94 4cyl but I had the exact same issue ended up being the camshaft sensor. You can get the sensor and tear the distributor apart and fix it for about 35 bucks, or you can get a whole new distributor for 5 bucks more.
__________________
94 YJ 2.5 5 speed
Trail master lift of unknown height and 1 inch boomerangs
Ramsey Pro 6000 winch
crunch is offline   Quote
Old 02-09-2012, 10:47 AM   #12
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Quote:
Originally Posted by crunch View Post
On mine granted it is a 94 4cyl but I had the exact same issue ended up being the camshaft sensor. You can get the sensor and tear the distributor apart and fix it for about 35 bucks, or you can get a whole new distributor for 5 bucks more.
So you had the problem of it only starting when cold? Once it gets warm the timing gets erratic?
TwoPointFiveLiter is offline   Quote
Old 02-09-2012, 08:32 PM   #13
Jeeper
 
crunch's Avatar
 
Join Date: Aug 2010
Location: Bowling Green, Ky
Posts: 253
Images: 9
I never thought to check the timing when it happened but as soon as it got warm it wouldn't start again until it cooled off. I started searching every web site I could find with no luck and finally had a Chrysler mechanic search his data base thats where I got my answer. I fought that problem for months replaced dang near every sensor in the darn thing.
__________________
94 YJ 2.5 5 speed
Trail master lift of unknown height and 1 inch boomerangs
Ramsey Pro 6000 winch
crunch is offline   Quote
Old 02-09-2012, 10:22 PM   #14
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Quote:
Originally Posted by crunch View Post
I never thought to check the timing when it happened but as soon as it got warm it wouldn't start again until it cooled off. I started searching every web site I could find with no luck and finally had a Chrysler mechanic search his data base thats where I got my answer. I fought that problem for months replaced dang near every sensor in the darn thing.
Well my cps isn't located in the disributor, it's on the bellhousing. I will start there, then try what the 2 previous posters said about flooding.

Although, I tried to do the cycling the key thing and it still stated when cold, so I dunno.
TwoPointFiveLiter is offline   Quote
Old 02-10-2012, 06:16 AM   #15
Jeeper
 
crunch's Avatar
 
Join Date: Aug 2010
Location: Bowling Green, Ky
Posts: 253
Images: 9
There is a camshaft position sensor and a crankshaft position sensor I might have the names switched but one is in the distributor and one is in the bellhousing.

I would try theirs too flooding makes sense except for the timing thing but that could be something separate.
__________________
94 YJ 2.5 5 speed
Trail master lift of unknown height and 1 inch boomerangs
Ramsey Pro 6000 winch
crunch is offline   Quote
Old 02-10-2012, 02:32 PM   #16
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
Well it's really odd. I apparently don't have a camshaft position sensor. I checked in my manual and everything. I even looked in my own distributor and there doesn't appear to be anything.

I will try to test the crankshaft sensor, and if that doesn't work, move on to the flooding thing. I hope it's one of those, because the only place I can drive to right now is...home. haha.
TwoPointFiveLiter is offline   Quote
Old 02-15-2012, 12:35 PM   #17
Jeeper
 
TwoPointFiveLiter's Avatar
 
Join Date: Feb 2012
Location: Central Massachusetts
Posts: 65
fixed it.

I replaced the ignition sensor, the ignition coil, and the crankshaft position sensor. Runs great now!

First run on pizza delivery, I hadn't even made it to work, hadn't even made it out of town, and my vent window fell out onto the ground. It sucked, but I couldn't help but laugh at how ridiculous it was.
TwoPointFiveLiter is offline   Quote
Old 04-10-2013, 01:33 AM   #18
Newb
 
Idl3hands's Avatar
 
Join Date: Apr 2013
Posts: 1
Thanks for the info here. Having similar prob with a 97 tj 4.0 5spd I just bought. Starts up great, runs strong even wit 197k miles, & idles smooth & consistent. but if i turn it off to stop for gas, it'll turn but takes forever to get it started. have been using the 'turn it on, turn it off, turn it on again' while waiting or the CE light to go off & that seems to help, but usually takes 2-4 attempts. Once I finally get it started though, there's no stutter, idle bump, or lag at all... As if nothing ever happened.
Gonna swap the distributor & clean the heck out of the throttle body & cross my fingers...I'm not a mechanic but not afraid of a wrench either so if anyone else has others ideas they're always appreciated! I'll post back my results.
Idl3hands is offline   Quote
Old 09-20-2013, 04:09 PM   #19
Newb
 
Join Date: Sep 2013
Posts: 1
Same problem with an 88

I have the same problem. Starts great when cold and if you try again within minutes after shutting it off, otherwise, when it gets warm it won't start. sounds like its loading up. If it were carburated, I'd know what to do but with TBI I'm lost. Mechanic replaced a bad ground to the computer, and it started right up until I shut it off 10 minutes later. He then said that the injector pig tails were bad, so I replaced all of them as well as the injector, plugs, cap and rotor, all spark plug wires, and crank sensor. Still won't start when warm.
I have had this car for over 20 years and have only had to rebuild the lower end 50K miles ago (mechanic error). Replaced both front axel assembies a couple of years ago and I am not about to give up on this car. I need help, any suggestions? Coil? Ignition sensor? New paint job? Holy Water?

padre75 is offline   Quote
Reply

Tags
2.5l , fuel , not starting

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
Seafoam? bato TJ Tech Forum 81 03-17-2014 01:37 PM
Engine quits intermittently!!! RickBrins YJ Tech Forum 10 08-22-2011 11:27 PM
Intermittent no-start after sitting all winter fr87hn TJ General Discussion Forum 5 03-30-2011 09:25 PM
'89 YJ: refuses to start positrak YJ Tech Forum 8 11-05-2010 10:10 PM
Spedo dies and the engine dies when I brake jbhouse2k TJ Tech Forum 4 03-06-2007 07:17 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 01:11 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

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