6.4 Stroker
Member
My brother has a 02 7.3 that's only starting when cold.
I plugged in my Auto Enginuiety so see what I could find. Came up with the typical p1280 and p121 codes.
When the truck is cold, it cranks longer than normal, but still starts ICP duty cycle starts around 20% and climbs up to 80% just before it finley starts.
When engine is hot ICP won't past 260psi even with 80% duty cycle.
Tried unplugging ICP sensor and no change. Threw a new ICP sensor And CPS sensor no change. Cleaned the IPR valve, and tried a known good IPR valve and no change. When the truck is running ICP is around 530 psi with duty cycle of 9-10%. Spliced new pig tails for ICP and IPR and nothing. Checked the fuel bowl and doesn't seem to be any oil contamination from bad O-rings.
I'm starting to run out of ideas.
Any thoughts or suggestions are appreciated!
I plugged in my Auto Enginuiety so see what I could find. Came up with the typical p1280 and p121 codes.
When the truck is cold, it cranks longer than normal, but still starts ICP duty cycle starts around 20% and climbs up to 80% just before it finley starts.
When engine is hot ICP won't past 260psi even with 80% duty cycle.
Tried unplugging ICP sensor and no change. Threw a new ICP sensor And CPS sensor no change. Cleaned the IPR valve, and tried a known good IPR valve and no change. When the truck is running ICP is around 530 psi with duty cycle of 9-10%. Spliced new pig tails for ICP and IPR and nothing. Checked the fuel bowl and doesn't seem to be any oil contamination from bad O-rings.
I'm starting to run out of ideas.
Any thoughts or suggestions are appreciated!