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3500 chevy SFI 5.7 runs good till you hit the throttle

At one pont you think it timming but then you think its running out of gas

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  • Cars & Trucks Master
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Check the fuel pressure. If pressure is good, possibly throttle position sensor, or MAF sensor-the MAF sensor can be taken off and cleaned with MAF cleaner. Handle it gently. and let it dry thoroughly before reinstalling. TPS can be tested with a voltmeter.

Posted on Nov 23, 2013

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  • Expert
  • 170 Answers

Fuel pump, filter, injectors.

Posted on Nov 23, 2013

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6ya6ya
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SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.

Sounds like it needs spark plugs and wires, and a fuel system treatment.

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pippall
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SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

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SOURCE: Chevy 3500 Express truck. fuel problem?

IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.

Posted on Sep 03, 2009

  • 1 Answer

SOURCE: 5.3 chevy hesitates when cold runs fine after warming up

I have same problem, Chevy told me it was probably a seal affecting fuel air ratio and when warm seal expanded to stop air leak. I forget which seal but they also said to check plastic case around seal because it will warp and may also need to be replaced. It was located near top center of engine. Please let me know if you figure it out.

Posted on Sep 14, 2009

morse008
  • 1111 Answers

SOURCE: 2001 chevy 3500 van Fuel pump out?

1st ensure the fuses are all good and there is fuel in the vehicle and your not getting a false reading by tapping on the tank ..does it sound Hollow oe Empty / another way is turn on the key and listen for the pump to work a slight humming should be heard ...if so locate the fuel bar and cap screw depress the valve shielding your eyes with say a towell and see if gas dispurses make sure the key is on while doing this if no gas is there or fuel pump is heard then it may be either a bad ground to the unit or the fuel pump itself corroded connections will contribute to this as well unclipping and reclipping the connection togeather should allow a better connection

Posted on Sep 26, 2009

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