put a new delphi hpop 3 weeks ago and now i put the new ipr valve and icp to hopefully get rid of the p1211 code when towing even in stock tune sometimes. been on going since truck had 5000 miles on it now has 55000. anyway truck does sound quieter idleing and seemed to pull better in the 80 econo so ill hook the auto enginuity up and see what it says. my p1211 in not due to low hpop i don think because when i got it on vacation my hpop was at 2500 plus and the light kicked on. with my old hpop i was below 1900 sometimes so that was a good fix. i guess we will see if not my BULB will be removed.

 

Watched my stock HPOP run from 475psi(idle) to 3,100psi(2800rpm) while puilling my 9000lb TT uphill at 75mph. Autoenginuity keeps the drive interesting!
Nut

 

I've been interested in how well the Delphi hpop works. For the price it's a good deal as a stock replacement, and if it can supply enough to handle the demands of a chip then it becomes a great deal. Keep us informed!