454 Engine looses power at 40 mph

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454 Engine looses power at 40 mph

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
454 Engine looses power at 40 mph	Mike	3-30-08
I purchased a 1988 Winn Chieftain 22 with a 454 carb engine. I replaced the plugs, wires, cap, coil and she runs great to about 40 mph. At 40-45 the motor looses power, sputters and back fires until I take my foot off the gas and then it will run up to 40 and do the same thing. The gas is new. I could not find the fuel filter so it has not been replaced. The motor only has 58k on it. I am looking for any help. Also has anyone worked on the wiper assembly? Thanks
Re: 454 Engine looses power at 40 mph	tom	3-30-08
Have the fuel pump checked. I experienced similiar proplems.
Re: 454 Engine looses power at 40 mph	Richard Adkins	3-30-08
Check on the inside of the right (passenger) side frame rail for an inline filter. If its a Quadrajet carb there should also be a filter behind the one inch fuel inlet fitting.
Re: 454 Engine looses power at 40 mph	Joel Ruffin	4-1-08
Start with replaceing the filters. They need replaceing anyway and are cheaper than testing the pump. U definitely are starved for fuel.
Re: 454 Engine looses power at 40 mph	rom	8-6-08
I have the same problem but i fixed it by my self first change the fuel filter and then cheked your alternator if they charging i replaced the alternator and the back firing is gone you know why i dont have the right voltage