fuel pressure regulator vacuum diagram..

[78F350]

My thought is that while you are in there it's a good idea to replace those 20+ year old plastic parts now rather than deal with it again 6 months from now.

Double check the wires that go to the knock sensor too. If the car has ever sat where rodents can get to it, they chew that particular wire for some reason. Usually the car won't throw a code and will run fine with the wires chewed through.

[jaimster]

so many thanks to 78F350
have been able to redo the vacuum system all new hoses , new check valve , one new changeover valve , new vacuum reservoir
new passenger side intake gaskets ..
soon after it appears fuel trims numbers were GOOD not so fast ! after several driving cycles now its up to

- 14.0 bank1 LTFT B 2 - 15.0 LTFT short ones fluctuates up and down

so this afternoon tested again the FPR seems to react right when disconnecting the vacuum line pressure goes up to 60 psi

listened to the fuel injectors with a headset stethoscope seem to be working right ..

02 sensors on both banks seem to move up/dowm on voltage (maybe have to pay closer attention to those numbers )

interesting enough all my emission components now are completed ready (7 of them )

I m NOW getting the P1130 code oxygen sensing on BANK 2 ???

guess car wont pass inspection due to the code even though components are completed ???

what am I missing looking at NEXT ??