no start problem when hot

[birdman]

the problem is only after the car gets warm then sits more than like 15 min. i can go for a drive, get it warm and turn it off and it'll start right back up but if it sits for longer than 10-15min it sometimes wont start or will almost die until i hit the gas. once its running its fine. any ideas? thanks.

[Pontiac6KSTEAWD]

You are suffering from a heat soaked starter by the sounds of it. Find a 3x00 starter, and swap them bad boys out..

[birdman]

it cranks just fine but acts like its flooded.

[Pontiac6KSTEAWD]

Oh, you didnt mention that...

 

That type of condition makes me think of a fuel pressure regulator, or maybe your injectors are leaking. Beyond that, I dont know. I dont know, or nor do I want to, anything about the 3.4.

[1990lumina]

This POS Park Avenue I was driving last week would do that....just floor the gas and crank the engine....that always made it start for me.

 

You could have leaky injectors or something that is causing the flooding

[birdman]

ive replaced the injectors with the 95+ ones with no difference to that problem. ive tried the floor it method and it has yet to work for me. can the FPR's get heat soaked? ive been wanting to replace it but there pricey.

[GP1138]

ive replaced the injectors with the 95+ ones with no difference to that problem. ive tried the floor it method and it has yet to work for me. can the FPR's get heat soaked? ive been wanting to replace it but there pricey.

 

If you're trying to diagnose a problem with the FPR, unplug the line from the top of it and see if that helps the problem. If it does, replace it. If not, your problem is not the FPR.

[birdman]

will the car run and drive with it off? because i can pull the line off with the plenum on but to put the line back the plenum has to be off. and i cant do that while its hot.

[Canada]

Replacing the fuel injectors did not make a difference? Weird, sounds fuel related.....because it starts when you put it in clear flood....holding the pedal to the floor.

 

First get a fuel pressure gauge and watch it......if pressure drops over the 15 min period, there is a leak some place in the system. You can also pull a spark plug and check to see if its wet or fouled with fuel when it won't restart.

 

They might be bad as well.....espessically if they sat for awhile. I know this involves pulling the intake......but get your fuel rail up and make fuel pressure in the rail by turning the key to on. Then look for leaks, sometimes a piece of paper under the injectors helps idenify leaks.

 

Beings that it only does it after 15 minutes when hot, its got to be the injectors. When the regulator leaks they typically run like ass all of the time.

[chadz34]

I have that EXACT problem with my 3.4 DOHC! It will start perfect every time in the mornign but when it gets hot, it just keeps cranking, struggling to start. Sonyman thinks it could be an Oxygen sensor since they are really the only thing that change when the temperature changes. If it were injectors, they would always leak and it would always have starting issues. I am gonna see what the Oxygen sensors do for me, and let you know.

[Regal_GS_1989]

If it were injectors, they would always leak and it would always have starting issues.

 

Maybe not. I had leaky injectors on my old regal. It would start fine in the morning, But if you shut it off and let it sit for a bit, it would crank over for about 5 seconds before it would actually start. If you put it in "clear flood", it would crank over 2 - 3 times and fire right up. If the injectors leak, and you let it sit over night, than some of the fuel in the combustion chamber evaporates and makes the car easier to start.

[birdman]

the "clear flood" thing never worked for me and ive replaced the o2 sensor and it made no difference. when i put the injectors in i turned the key on to make sure the o-rings were sealed good and to check for any other leaks and there didnt seem to be any. when i did take the plugs out one time when it wouldnt start they didnt seem wet the actually looked like they may have been running lean but this was before i did the injectors and o2. the only other things that i could think of is mabey timing or my pcm. the pcm is last on my list but along with this no start problem at wot is bogs for a few seconds. i looked at the pcm and it says remanufactured on it so it must have been replaced and it may need to be again i dont know. i also ohmed out all the injectors and they were all good in that respect. any more ideas? thanks.

[JW]

you should check to be sure if you have spark or not when this occurs. when the crank sensor in my 89GP went it was the same story. but the pcm was saying no spark cause no input from the CPS. and it only happened when the engine was hot.

[greekguy7]

yes.... assuming u ohm'd out all 6 injectors with a meter and they were all over 12ohms, the next time it wont start, check if u got spark. If not, it may be your crank sensor or your ignition control module. Also, check that u got around 40psi of fuel pressure while cranking when the car wont start.