It runs fine until i go over a hill or just want to give it gas on the freeway. it softly does small backfires when i give it gas ..but when i go over a hill it backfires pretty bad no power and fells like it pulls the whole truck back ..any suggesting will be greatly appriciated ..thank you sorry for any misspelled words alil in a rush ,thank you
Backfiring occurs when uncombusted gasoline gets into the muffler. You will have to figure out if the engine is flooding and why (can be a lot of things - poor ignition, problem with fuel pressure regulator or an injector, vacuum leak, etc.). Existing trouble codes (DTCs) will help you diagnose the problem.
SOURCE: 99 gmc no power when passing or climbing
It could be electric fuel pump stall. The pump isn't pumping fuel fast enough. This model may have a inline fuel filter before the fuel pump as well that might need replacing.
SOURCE: 2001 GMC Yukon Flashing Check Engine Light
dear sir the flashing check engine light means the truck was misfiring at the time of the incident .If the light is still on you can go to auto zone they will pull the codes for you and reset the light if you like.but if running good now then probably nothing to worry about .
SOURCE: 1991 gmc med duty truck with 454 tbi ,backfires, no power.
By module do you mean computer? There's nothing wrong with it. Yea, replace all ignition components with new ones. New cap, rotor, wires and spark plugs.
SOURCE: 1999 GMC Yukon seems to backfire once in a while
look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng
SOURCE: Have a 98 gmc 5.7 truck have to prime to start truck.
Sounds to me like either your pressure regulator is bad or you have a loose fitting somewhere in the fuel line from the fuel pump to the engine. When you turn your key to the on position, you should hear the whine of the fuel pump until it builds pressure. When you shut the truck off the pressure regulator should retain the pressure for a certain amount of time but if it don't close then air is allowed into the fuel line and the fuel drains down to fuel line away from the engine. Next time you try and start the truck after it has sat for a while try turning the key on until you hear the fuel pump whine shut off, then repeat it 3-5 times and then try to start it. Basically that is running the pump enough to get the fuel back up to the injectors. Check for loose fittings in the fuel line, or cracks in the fuel line and if all that is fine then replace the regulator.
Hope that helps
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