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-   -   engine won't start after getting warmed up and sitting. (http://www.wranglerforum.com/f218/engine-wont-start-after-getting-warmed-up-and-sitting-138128.html)

TwoPointFiveLiter 02-07-2012 12:44 PM

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!

barjeep 02-07-2012 03:17 PM

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

TwoPointFiveLiter 02-07-2012 04:14 PM

Quote:

Originally Posted by barjeep (Post 2004033)
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.

1fast lorinser 02-07-2012 08:48 PM

Just a thought but check your fuel filter

TwoPointFiveLiter 02-07-2012 10:51 PM

Quote:

Originally Posted by 1fast lorinser (Post 2005303)
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 02-08-2012 04:24 PM

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 02-08-2012 06:08 PM

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!

ballistx 02-08-2012 07:29 PM

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?

TwoPointFiveLiter 02-08-2012 08:39 PM

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.

SandyMushYJ 02-08-2012 09:09 PM

Quote:

Originally Posted by ballistx (Post 2008384)
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.

crunch 02-09-2012 10:08 AM

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.

TwoPointFiveLiter 02-09-2012 10:47 AM

Quote:

Originally Posted by crunch (Post 2010416)
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?

crunch 02-09-2012 08:32 PM

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.

TwoPointFiveLiter 02-09-2012 10:22 PM

Quote:

Originally Posted by crunch (Post 2012328)
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.

crunch 02-10-2012 06:16 AM

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.

TwoPointFiveLiter 02-10-2012 02:32 PM

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 02-15-2012 12:35 PM

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.

Idl3hands 04-10-2013 01:33 AM

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.

padre75 09-20-2013 04:09 PM

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?


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