starts fine and idles when cold misses at idle after it get up to temp then misses at idle will still rev up until temp reaches normal then it dies will not start back untill cold anyone have any answers it codes p1391

 

P1391 possible loss of cam or crank sensor signals:

Figure out wether you are losing crank signal or cam signal when hot. What can be happening is on end the engine is hot, and the heat transfers to the sensor, it shorts internally and causes a intermittent loss of either signal.

Test for cam signal at the injecors, check for injector pulse.

But it sound so more like loss of crank signal. Test for that at the crankshaft sensor connector. If you end up having to replace that sensor it's a bear to get to. Just behind the passenger side head, on top the transmission. Need like 3 elbows for the job.

 

have changed crank sensor and pickup in distributor will run fine around 1500 rpm if you try to let it idle it dies won't start again untill it cools off changed iac control too

 

Disconnect the front O2 sensor, and see if it runs any better.

 

Tried that and changed throttle position sensor still does the same thing

 

Was the battery drained recently? On my 01 if the battery dies I have to start it hold the gas down a bit for like 2 minutes or it will just die.

 

Have charged the battery it's at full charge also replaced the coil

 

The only other thing I can think off is these two options:
1. the crank, iac, or cam sensor if not oem is junk (since you replaced almost everything they can cause a no idle) happened to me a few times
2. The cat is clogged
HeyYou chime in if I'm wrong

 

fuel pump... i had the exact same problem. would start and run, then die and not start till the engine cooled off. had my parts cannon going full auto thinking it was something under the hood since it would start again after the engine cooled off... till i checked the fuel pressure when it wouldn't start... the pump was working long enough to get the engine warm, after that it would quit or wouldn't start again after a short trip till everything cooled off. simple check to confirm... either check pressure when it warms up and refuses to start or spray something highly flammable like carb cleaner in the air cleaner and try to start it... it will start for a moment using the flammable method. thats how i test fuel pumps on the side of the road where they usually die without warning. should make sure to use a sensor safe spray so you don't kill anything, but i never have. i just use brake/carb cleaner, preferably something explosive that wont leave a residue.

 

Could my ect sensor cause this because it gets worse as it warms up