Truck misses/stutters when hot
#1
Truck misses/stutters when hot
Background- 1999 24v Cummins. Mechanical fuel pump, Blue Chip Diesel VP44
Truck seems to have constant nagging fuel problems. Replaced the mechanical fuel pump today after noticing it dripping fuel on the ground and the truck felt like it was shaking/missfiring.
After installation, the truck ran fine. It made good power and all was well. After driving 3-4 miles, the truck started bucking and kicking like it was missing on random cylinders. Let it cool down for an hour, and it started running fine again. Another mile or two of driving and the symptoms came back...... but worse. Pulled into a parking lot and shut the truck off for 10 minutes to cool down. Started it back up to make the last trek home and it ran fine again for a few more minutes.
The truck starts fine, both hot and cold. It stays around 19psi of fuel pressure, and runs fine when the engine is still fairly cold. In the gasser world, it has the same symptoms as an O2 sensor or CPS going south.
Any ideas? Ditch the VP44 and all the electronics in favor of a 160 P-pump?
Truck seems to have constant nagging fuel problems. Replaced the mechanical fuel pump today after noticing it dripping fuel on the ground and the truck felt like it was shaking/missfiring.
After installation, the truck ran fine. It made good power and all was well. After driving 3-4 miles, the truck started bucking and kicking like it was missing on random cylinders. Let it cool down for an hour, and it started running fine again. Another mile or two of driving and the symptoms came back...... but worse. Pulled into a parking lot and shut the truck off for 10 minutes to cool down. Started it back up to make the last trek home and it ran fine again for a few more minutes.
The truck starts fine, both hot and cold. It stays around 19psi of fuel pressure, and runs fine when the engine is still fairly cold. In the gasser world, it has the same symptoms as an O2 sensor or CPS going south.
Any ideas? Ditch the VP44 and all the electronics in favor of a 160 P-pump?
#2
#4
Background- 1999 24v Cummins. Mechanical fuel pump, Blue Chip Diesel VP44
Truck seems to have constant nagging fuel problems. Replaced the mechanical fuel pump today after noticing it dripping fuel on the ground and the truck felt like it was shaking/missfiring.
After installation, the truck ran fine. It made good power and all was well. After driving 3-4 miles, the truck started bucking and kicking like it was missing on random cylinders. Let it cool down for an hour, and it started running fine again. Another mile or two of driving and the symptoms came back...... but worse. Pulled into a parking lot and shut the truck off for 10 minutes to cool down. Started it back up to make the last trek home and it ran fine again for a few more minutes.
The truck starts fine, both hot and cold. It stays around 19psi of fuel pressure, and runs fine when the engine is still fairly cold. In the gasser world, it has the same symptoms as an O2 sensor or CPS going south.
Any ideas? Ditch the VP44 and all the electronics in favor of a 160 P-pump?
Truck seems to have constant nagging fuel problems. Replaced the mechanical fuel pump today after noticing it dripping fuel on the ground and the truck felt like it was shaking/missfiring.
After installation, the truck ran fine. It made good power and all was well. After driving 3-4 miles, the truck started bucking and kicking like it was missing on random cylinders. Let it cool down for an hour, and it started running fine again. Another mile or two of driving and the symptoms came back...... but worse. Pulled into a parking lot and shut the truck off for 10 minutes to cool down. Started it back up to make the last trek home and it ran fine again for a few more minutes.
The truck starts fine, both hot and cold. It stays around 19psi of fuel pressure, and runs fine when the engine is still fairly cold. In the gasser world, it has the same symptoms as an O2 sensor or CPS going south.
Any ideas? Ditch the VP44 and all the electronics in favor of a 160 P-pump?
#5
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#8
It should be able to give you basic codes some may not be given a full definition in the scanner but should give you the code numbers. Also go over your ground wires all that you can find very carefully inculding battery terminals clean and tighten if neccicary. And if you have trouble with the scan tool you can pull the codes manually by cycling the key on and off 3 times on the 3rd cycle leave it in the on position and the codes will be displayed in the odometer area.
#9
It should be able to give you basic codes some may not be given a full definition in the scanner but should give you the code numbers. Also go over your ground wires all that you can find very carefully inculding battery terminals clean and tighten if neccicary. And if you have trouble with the scan tool you can pull the codes manually by cycling the key on and off 3 times on the 3rd cycle leave it in the on position and the codes will be displayed in the odometer area.
#10