lb7 surging,, fpr???

[dmaxadermist]

well i have another problem my 03 lb7 is surging at idle and while driving down the road hooked it up to the tech 2 and i noticed that when it surges at idle the desired fuel rail pressure is 4900psi and the actual is as much as 6000psi to 7000psi when it surges, it gets annoying when i am driving i am thinking its the fuel pressure regulator but i have had it priced and its fairly expensive so i want to make sure thats it any response or expirience would be greatly appreciated thanks alot

 

[Burn Down]

Sounds just like the one I replaced in a fellows LB7. GMPARTSDIRECT.COM has some really good prices. No codes?

 

[dmaxadermist]

no no i hve no codes except for a p0102 and i think p0103 wkich are MAF sensor circuit low voltage and maf performance i need a 186 dollar MAF sensor i originally thot this could be it, and it could have somthing to do with it but it had done it even before that MAF codes were set so idk but thank you

 

[Burn Down]

Yep, MAF won't cause spikes in the fuel pressure. Maybe someone on here will have a used FPR for a good price you can try.

 

[TheBac]

Yes, that sounds like a bad FPR. Huckstorf had them for a good price last time I knew.

 

[SDE]

They're alot cheaper at a Bosch service dealer than at a GM dealer. Call anyone in your area that is a diesel fuel shop that is a bosch service dealer. The Bosch part # is 0-928-400-535 for a LB7. We have them too if you need them.

Spencer