Puts a P0401 EGR insufficient flow fault in the system!
All data looks good!
Tried a Mass air flow with no change in symptom!
Measured current waveform at the primary fuel pump fuse seems good pattern & amperage at 5 amp!
This one does seem to struggle starting in a morning & cranks just a bit longer on first cold crank! Primary pump sounds a little noisy!
Have my suspicions that the primary pump is inefficient or failing!
Does anyone have a primary fuel pump pressure data?
Have a actual reading of delivery rate in % on the scan tool & seems to max out at 25% But not sure what that reading is for!
Have secondary pressures actual & expected & look good & even.
EGR looks to be working O.K! This animal uses the mass air flow to determine EGR duty cycle opening.
The primary pump is on my mind
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