'97 4.3 S10 bogging problem....FPR was bad, and inj. o-rings

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Mar 30, 2007 | 01:44 PM

#21

Bonneville92V688

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Update! FP is 1-2 PSI lower than what it'* supposed to be, so I decided to pull the composite upper intake off, sure enough, gas pooled in the LIM. Looks like the FPR failed by how there was gas leaking out of the vacuum nipple for it. That and the injector O rings will be replaced, along with the UIM gasket and TB gasket. Oh well I am not worried, its quite typical for the CSFI system.

Mar 30, 2007 | 01:48 PM

#22

banned3800

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Yes this is a common issues with that system... Its a freaky design, but it does serve its purpose.. I think GM should have just designed a true PFI system for it as opposed to having it hang out in the intake...

You should get a lot of miles out of that 4.3

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Mar 31, 2007 | 08:07 PM

#23

Bonneville92V688

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Well I ordered a FPR, injector o-ring pack, fuel line o-rings, plenum gasket, and TB gasket. We shall see how it goes this week. Yeah but sure enough, the FPR was bad, I hooked it up to a vacuum gauge to see if it held vacuum, and sure enough, it didn't, I could hear it leaking. I swear GM and their Bosch FPRs.

Here are just some random *** pics.

Circled in red, where the gas was pooled.

Injectors anyone?

UIM

Nice, clean TB

Current way it is

Apr 5, 2007 | 08:16 AM

#24

Bonneville92V688

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Parts came yesterday!

Apr 5, 2007 | 08:17 AM

#25

BillBoost37

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Great..things look ready to be reassembled... remember to lightly apply some PTFE GM pipe sealant to the threads on teh lower intake bolts to keep oil from wicking up them.