Chevy Suburban High Performance Fuel Pressure Problem

[Casey]

1999 chevy suburban
Has been upgraded as much as you can. Has headers, supercharger ect ect....
Work done to repair this problem = changed fuel pump twice
question = I have a high performance suburban and I have changed the fuel pump twice now to high performance ones. Neither could keep up with the fuel rate. What barnd would you recomend for my truck please...thanks so much

[4kevin69]

Do not have information on this type of modification. Not familiar with what type of aftermasket fuel pump is best.
All fuel pumps should put out a max of about 70 PSI under complete restiction, which should be enough. Check fuel pressure regulator settings. I would assume it is not factory.

[CATALYTIC1]

Do not have information on this type of modification. Not familiar with what type of aftermasket fuel pump is best.
All fuel pumps should put out a max of about 70 PSI under complete restiction, which should be enough. Check fuel pressure regulator settings. I would assume it is not factory.

IF HE HAS THE POPPET SET-UP [CFI] ,MORE THAN 220@050 LIFT ON CAM, I THINK HE SHOULD UPGRADE HIS EFI. HE DID NOT SAY THE WORD "CARB" EITHER. WHAT DOYA THINK??

[butchkaz]

Do not have information on this type of modification. Not familiar with what type of aftermasket fuel pump is best.
All fuel pumps should put out a max of about 70 PSI under complete restiction, which should be enough. Check fuel pressure regulator settings. I would assume it is not factory.

IF HE HAS THE POPPET SET-UP [CFI] ,MORE THAN 220@050 LIFT ON CAM, I THINK HE SHOULD UPGRADE HIS EFI. HE DID NOT SAY THE WORD "CARB" EITHER. WHAT DOYA THINK??

Makes sense. Thanks for the input CATALYTIC1 !

[ok317]

Hi
i have a 2002 chevy suburban that was parked for about 2 years & my abs & air bag light are on all the time & when i hook up the tech 2 it says no comunication to bcm:
i checked the grounds & all the fuses what alse can it be ?

[butchkaz]

It depends on what the codes are in the ABS module and the SDM. The BCM is not the module that would cause the ABS and Airbag light, although these condition may all be related.
You have sevral problems.
There could be a problem in a communication wire splice that these 3 system modules share.
Clear all the codes with the Tech 2, then start the truck. After the ABS and Airb bag lights come on, scan the codes from the ABS and SDM.

[KElco]

My 2000 Suburban backfires (pops) through the intake system when it goes from overdrive to passing gear, usually on a incline. It runs fine other than this, There are no codes showing. Could this be a fuel, or transmission problem????? THANKS for your thoughts.......

[carriedi]

backfire into the intake could be something as simple as a lean miss (fuel related) all the way to a mechanical problem (valve sticking, worn cam...) If you can duplicate the miss on a regular basis you may want to drive the vehicle with a scanner hooked up. This way you can watch what the computer sees when you have the problem. You can see if there is a lean condition under a load. You could also see if the misfire counter can see what cylinder it sees is missing. Or you might want to drive it while you have an ignition scope hooked up to watch your secondary ignition pattern when the problem shows up.

Might also check to see if your cat is a little restricted. Check the back pressure under a load

[Dmantooth]

Could misfire be caused by low voltage knock sensor

[carriedi]

knock sensor will affect the ignition timing. It should not affect whether a cylinder will misfire (usually under normal circumstances) A misfire that causes a ping could cause a knock sensor code though.

[kasey]

New engine/transmission Sept '16 (131k miles). Car started making a bumping sound & medal sound like a hard shift typically around 30-40 mph. Warranty replaced tranny Jan '17 (141k) with another new one. Picked car up today...same bumping problem. Trans guy has no idea. Any thoughts?

[carriedi]

without driving, feeling, hearing what the noise/bumping, I would have a bigger problem guessing what the problem is than the tranny guy. Is it just one bump when it happens? Is it like you're running over a series of bumps? Did the tranny guy drive it with a scanner on the trans? Torque converter problem? Where does it feel like it coming from? Does it happen every time or just occasionally?