HELP with codes!!

millerman04

millerman04

< The Man Cave
Jul 14, 2010
1,039
0
0
38
Clearville, Pa
Keep getting the following codes, P0088, P0089, and P0090. Changed FPR yesterday. Still getting codes, and still has lope at idle, fuel knock, and wont go higher than 2,000 rpm's. Haven't ran any logs yet to watch anything. All harness plugs seemed to plug in fine. Been acting up since Christmas. Problems went away for a week or so, and then came back, and haven't left since. I removed the FPRV shim kit I had installed. Should I put it back in? Or could I have a fuel rail pressure sensor going bad? Thanks!!
 
Awenta

Awenta

Active member
Sep 28, 2014
4,090
2
38
CT
Have a log? Anything fuel related.

Wires to the fpr good? Try playing with the bale connectors on the motor and see if it clears up.

Have a lift pump?

Sent from my SM-N910V using Tapatalk
 
Awenta

Awenta

Active member
Sep 28, 2014
4,090
2
38
CT
Get a log. And mess with the bales while it's running.

What's lift pump psi? Might be too high.

Sent from my SM-N910V using Tapatalk
 
millerman04

millerman04

< The Man Cave
Jul 14, 2010
1,039
0
0
38
Clearville, Pa
Truck had run fine before with lift pump set at out of box psi. Ive even turned it down some. Filters are new. Except water seperator on lift pump. Injectors are a year old.
 
blk smoke lb7

blk smoke lb7

<-----Lots of green $
Nov 8, 2010
5,694
0
36
57
belvidere,ill
Try some 2 stroke in the fuel a hole quart to a full tank.I had a buddy that had the same problem.Wouldnt hurt to get that upper cylinder cleaner from gm pull the fuse to the lift pump disconnect supply and return fuel lines dump the hole bottle of upper cylinder cleaner in a gallon jug rig up 2 lines to go from the jug to supply and return start the truck let it idle till all gone.
 
Awenta

Awenta

Active member
Sep 28, 2014
4,090
2
38
CT
Any smoke?

Turn off the lift pump and see if it still does it.

Sent from my SM-N910V using Tapatalk
 
You must log in or register to reply here.
Top Bottom