kopbet89c4

Well, the actual problem was bucky shifting from 1st to 2nd on WOT but now the GM dealership now says I'm not getting enough fuel on top end. Basically it seems to cut off the fuel before 5k rpms (usual shift point) I have not told them that I have changed the fuel pump with a Bosch brand fuel pump. I changed it exactly how it said in the book and internet, along with a new sock, and filter, but still they say I'm not getting enough fuel. I have now singled out that it may either be clogged fuel lines or dirty/clogged/faulty injectors or bad fuel rails. According to them, there are no fuel leaks. Would it be a good idea for me to get some fuel injector cleaner and use 93 octane gas, instead of 89 octane mid-grade?

CFI-EFI

Connect a pressure gauge and take it for a WOT run. Pay the closest attention at the highest rpm and under the greatest load. If the pressure holds, it could be injectors, but nothing before them in the fuel circuit.What are they basing this diagnosis on? Is your engine heavily modified? Higher octane gasoline won't help a thing.

RACE ON!!!

Pete K

Have a look at the fuel lines in the rear of the car. They can be crushed by a floor jack. Something to check that is easy to do and free.

kopbet89c4

Ok, so I get one, there is really no way to get the fuel gauge in the car. Should I just tape the gauge to the window and read it from there, during the initial WOT run?

Unriced

Yup...and check your TPS...misadjusted it can affect WOT...

CFI-EFI

YEP! I just run the hose underneath the wiper blade and use a piece of tape to keep it in place.

RACE ON!!!