I got a 1999 Durango 5.2L SLT and it wont start when warmed up.
It will start fine when its cold but when I drive it for a few miles and let it sit for a few minutes and start it again, it wont start. The battery is fine and it acts like it wants to start. It just keeps cranking. Fuel pump is working, I'm thinking it is a computer problem or something. No odd noises were heard.

 

kinda sounds like an IAC motor being bad, try holding the gas pedal open a bit while cranking (not all the way, just a little bit) if it starts up ok that way id replace the IAC

 

Also, if it is working when you open up the throttle a little bit, check your air filter. Sounds stupid but is typically the best place to start along with the IAC valve like shrp stated.

 

I tried pushin the gas down a bit and I also tried pushin it down to the floor, It seems like a fail safe in the car is activating, I felt the coolant tubes and they seemed very warm, but the gauges read fine. Im thinking the truck might be over heating, possibly a new water pump?

 

I also had to take the condensor out of the car and have not replaced it. Took out the ac tubes and the componant that attaches the tubes to the compressor. Would that affect a fail safe somehow? Do I need to have the AC in the car in order for it to run correctly?

 

you should not need the a/c for the truck to run correctly, however if you dont have the tubes hooked up you should have an a/c bypass belt on there

 

You don't need the A/C, just plug up the all the holes on the lines and compressor so no junk gets in there. With the clutch not engaged the pulley on it spins insanely freely so it should be fine, just pull your A/C clutch relay in the PDC to be safe.

The hoses are suppose to be pretty warm, just keep an eye on your temp gauge on the cluster to see if it's over heating or not.

I had this same problem with mine a while back, it turned out to be that it was actually flooded or one reason or another. Pull a sprak plug out and see if it's wet at all, since you have it out, check for spark too while cranking. And finally check to see if the fuel rails are holding pressure a few minutes after your shut it off, it could be a leaky injector.

 

Could be a coil.


You should check for spark and fuel.

 

Well, I got the truck to fail again, checked the spark plugs and it has the nice tan color, so signs of flooding. I called my mechanic and he said to use starting fluid and to see if that works, and it didn't. Didn't check the spark, gonna do that tomorrow since its easier with two people. Gonna have my mech check the fuel pressure and use a diagnostic scanner next week. It seems like an electrical problem, Thanks all for the info. I'll check back in.

 

A tan color means it's running a tad bit on the lean side. If starting fluid didn't do anything for you, then the next suspect is deffinetly spark, could be because of a bad coil or some of your wire shielding is cracked and shorting out.