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1999 2500 express van 5.7ltr..psi..injectors..van idles..hit gas pedal…

Customer Question
hello i am working on...
hello i am working on a 1999 2500 express van 5.7ltr. i have 55 psi fuel i installed new fuel pump and spider injectors. van idles when hit gas pedal no power but pressure is ok. i spray carb cleaner in breather and can accelerate no problem. if i play with gas pedal i can get to rev up slow but no load at all like no fuel.
Submitted: 8 years ago.Category: GM
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Answered in 2 minutes by:
6/10/2010
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 30,420
Experience: GM Grand Master Technician 2007. 14 years experience.
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Greetings and Welcome to Just answer.

Are there any codes set in the computer?

 

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Customer reply replied 8 years ago
lean condition oxygen sensor i cleared it since no hard codes back yet.
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

OK, which sensors?

 

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Customer reply replied 8 years ago
BANK 1 SENSOR 2
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

Ok, check the wiring around that sensor. That one is only for catalyst monitoring.

 

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Customer reply replied 8 years ago
OXYGEN SENSOR WIRE IF IT WAS BROKE CODE WOULD BE ON RIGHT AWAY. WHEN I HIT THE GAS PEDAL I GOT NO POWER AT ALL FALLS RIGHT ON ITS FACE LIKE I LOST FUEL PRESSURE. I SPRAY CARB CLEANER I CAN RUN IT NO PROBLEM.
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

THe light may not come on straight away.

but you replaced the sensor and it worked fine or just cleared the code?

 

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Customer reply replied 8 years ago
I JUST CLEARED THE CODES TO SEE IF ANY HARD CODES WOULD COME BACK. OXYGEN SENSOR WOULD GIVE YOU THAT CONDITION.
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

Not that sensor. The fact that you can add the spray to the intake helps to confirm a fuel issue. I suggest you test the fuel pressure and replace the fuel filter. Spec on the pressure is 60-66 psi and never below 55 or so when running.

Also try cleaning the mass air flow sensor at the air filter.

 

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Customer reply replied 8 years ago

THAT WHAT I WAS SAYING I REPLACED FUEL PUMP AND INJECTOR WEB ALREADY AND FILTER. I HAVE 60 PSI AT IDLE WHEN I DO REF ENGINE UP PRESSURE GOES UP TO 65. I JUST CANT IMAGINE WHAT ELSE FUEL CAN BE LOST OR MY ONLY OTHER THOUGHT IS COMPUTER NOT FIRING INJECTORS IS THAT POSSIBLE. MAYBE FLASHING OF COMPUTER. NOT TRYING TO BE ANNOYING SORRY I JUST NEED ANOTHER GOOD OPINION I SPENT 2 DAYS ON THIS THING.

GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

OK, I understand perfectly now. Does it idle smoothly?

 

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Customer reply replied 8 years ago
YES
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

Map reading at idle and when reving?

 

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GM Mechanic: GM Tech (Cam), GMC Mechanic replied 8 years ago

Also, do you have the ducting off the throttle body? If so put it back on and try.

 

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