Engine/Transmission (1998.5 - 2002) won't start when hot

[dskaggs]

have 98. 5 24v dodge 3500 starts fine when cold or engine cools down. drive in hot weather and turn off,won't start again till engine cools off. anyone have ideas.

 

[ROADWARRIOR]

This can be caused by a bad board on the top of the VP44. Next time it happens, try cooling the black box off on top of the pump with water and see what happens.



Dan

 

[ROADWARRIOR]

Another possibility could be that your lift pump pressure is too high. I experienced that after installing a FASS and had to fix that.



Dan

 

[dskaggs]

wouldn't lift pressure be same wether engine is hot or cold--no fass.

 

[GarrettPetersen]

I had the same problem and it turned out to be the VP. Never threw any codes till the day it just gave up the farm all of a sudden. Probably not the news you wanted to hear but that was what was up with mine.

 

[Texas Diesel]

There is a computer reflash for "hard starting when hot". I cant tell you what the reflash does but it works. And you will get the cold idle engine warming software too (and lose your oil pressure guage... )

 

[ROADWARRIOR]

There is a computer reflash for "hard starting when hot". I cant tell you what the reflash does but it works. And you will get the cold idle engine warming software too (and lose your oil pressure guage... )

I think the reflash keeps the lift pump from running while the engine is being cranked over.

 

[ROADWARRIOR]

wouldn't lift pressure be same wether engine is hot or cold--no fass.

Yes, but the VP44 can have a "hot hard start" issue with too much inlet fuel pressure.