lbz P0090

Chuckiefishin' · 12-24-2012, 11:06 AM

2007 Classic LBZ.
Check light came on, wouldn't go above 2 grand. Scanned, P0090 code, cleared it and drove it with the scanner plugged in, pressure was between 4000psi idle and 20000 psi pegged.
Cleared code, changed fuel filter, drove for about 50 miles, code came back.
Started cold this a.m., clattered like a cummins at idle after it warmed up the clatter went away a bit.

I've searched the forum and have a few ideas but would welcome more.

Thanks

clinebarger · 12-24-2012, 05:05 PM

I had that code once, The Yellow wire broke right at the Fuel Pressure Regulator plug.

Chuckiefishin' · 12-25-2012, 03:52 PM

which side of the block is the sensor on? Staring at the motor from the front bumper.
Thanks for the info, I'll check wires if I can figure out which is what...

clinebarger · 12-25-2012, 04:34 PM

The FPR is located on the CP3 injection pump. I was going after the FPR solenoid when I found the broken wire, Still replaced the FPR solenoid & FPR connector.

Chuckiefishin' · 12-27-2012, 04:33 PM

Turns out it was the yellow (ground wire) a couple of connections away from the FPC. Insulation looked fine but the wire had resistence, which it should've have, located the short and fixed it. Fingers crossed that it was just the yellow wire.
Thanks for your help.

12-24-2012, 11:06 AM	eBay Motors #1 (permalink)
Chuckiefishin' Join Date: Dec 2012 Posts: 4	lbz P0090 2007 Classic LBZ. Check light came on, wouldn't go above 2 grand. Scanned, P0090 code, cleared it and drove it with the scanner plugged in, pressure was between 4000psi idle and 20000 psi pegged. Cleared code, changed fuel filter, drove for about 50 miles, code came back. Started cold this a.m., clattered like a cummins at idle after it warmed up the clatter went away a bit. I've searched the forum and have a few ideas but would welcome more. Thanks

12-24-2012, 05:05 PM	eBay Motors #2 (permalink)
clinebarger Senior Member Join Date: Dec 2012 Location: Fort Worth, Texas Posts: 322	I had that code once, The Yellow wire broke right at the Fuel Pressure Regulator plug. __________________ 2006 Chevy LT3 CCSB 2500HD LBZ/Allison AirDog 100, Nicktane CAT filter head, Billet bleed screw, Blocked EGR, Bilstein, AAM alum. diff cover, Michelin M/S2. 1985 Chevy C20 Suburban with a '04 5.3L/4L60E K&N intake tube w/ stock box, Built trans, Michelin A/S.

12-25-2012, 04:34 PM	eBay Motors #4 (permalink)
clinebarger Senior Member Join Date: Dec 2012 Location: Fort Worth, Texas Posts: 322	The FPR is located on the CP3 injection pump. I was going after the FPR solenoid when I found the broken wire, Still replaced the FPR solenoid & FPR connector. __________________ 2006 Chevy LT3 CCSB 2500HD LBZ/Allison AirDog 100, Nicktane CAT filter head, Billet bleed screw, Blocked EGR, Bilstein, AAM alum. diff cover, Michelin M/S2. 1985 Chevy C20 Suburban with a '04 5.3L/4L60E K&N intake tube w/ stock box, Built trans, Michelin A/S.

12-27-2012, 04:33 PM	eBay Motors #5 (permalink)
Chuckiefishin' Join Date: Dec 2012 Posts: 4	figured it out Turns out it was the yellow (ground wire) a couple of connections away from the FPC. Insulation looked fine but the wire had resistence, which it should've have, located the short and fixed it. Fingers crossed that it was just the yellow wire. Thanks for your help.

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12-25-2012, 03:52 PM	eBay Motors #3 (permalink)
Chuckiefishin' Join Date: Dec 2012 Posts: 4	which side of the block is the sensor on? Staring at the motor from the front bumper. Thanks for the info, I'll check wires if I can figure out which is what...

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