croketa1

ok guys i think its gana be my fuel pump but not sure, as long as i stay under 3k rpm it will run fine, but if i punch it it will start cutting out , its driving me crazy, it doesnt show a check engine ligh, anf some mechanic run the car with a computer attached to it and it shows that after 3k rpms the fuel delivery decreases, any suggestions, my coils are fine, spark plugs are new .

Repzard

Did you ever change fuel filter?

croketa1

supousely the mecanic changed everything exep the fuel pump , beacuse the waranty doesnt cover it

uberstang1

Ummm....... What kind of warranty covers fuel filters and spark plugs on a car 12 years old but not cover a fuel pump.

croketa1

thats whatt im sayin

swarthyfellow

what are u measuring to see that the fuel rate decreases?

croketa1

well the mechanin hooked upthis module to the car and ran it with me inside and i saw it too when ever it goes over 3k rpm the fuel delivery decreases

swarthyfellow

Right, but what method was used. Reading 02 output or injector duty cycle or fuel pressure... My point is there is a number of ways to see a decrease in fuel. If the duty cycle stays the same and the fuel pressure drops, less fuel will be injected.
If the duty cycle changes than there is something causing the computer to think it needs less fuel.
Your MAF may be acting up and not reading right at higher flow rates could be worth checking.
I would start by making sure your fuel pressure stays steady first though.

croketa1

oh yeah the ecu and maf, have been checked and they r fine, let me start from the beggining , i was putting in arco fuel the premiun one, and it started doing the fuel cut, and the car would idle bad like almost wanting to shut off, the i started putting in chevron the premiun one too, now i feel the car has more power , wont idle bad anymore but it still doing the fuel cut after 3k rpms

swarthyfellow

will it do it when you rev it in neutral?