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by Anonymous on May 19th, 2007

Anonymous

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Help answer this question below.

I have 1976 gm motorhome with a 454 in it have to fether the gas pedal to start up from a steep hill it bogs with no power but on highway runs fine

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Answers. 4 helpful answers below.

  • by Anonymous on December 17th, 2007

    Anonymous

    Well after turning wrenches for over forty years and owning several RVs I hope I can help out some. One thing I would check and replace would be the ignition coil. I had a similar problem that turned out the coil was weak though it ran fine on the flats. I would use an MSD coil preferably, Summit or an Accel Super coil. New wires would be the next thing to replace if they haven't been replaced in some time. 8-8.5mm MSD or other performance wires sure helps. I use them, the red ones, on my pick up. They have the lowest resistance per foot which allows more spark to your plugs. Some have such high resistance that much of the spark never gets to the plugs. Also your HEI module could be weak. Check the cap for burned marks and corroded contacts. A new fuel filter wouldn't hurt. I think its ignition, at least thats what I would go for first. A plugged fuel system is also possible. Depending on the size of your rig, I would get a smaller engine such as a 400 big block balanced, a bit hard to find, ported and polished with a 600 cfm Edelbrock carb. Good power and better mpgs. Just a suggestion. I wish you well.

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  • by Yodarunner on June 18th, 2007

    Yodarunner

    Sounds like your ignition timing needs to be adjusted or the vacuum advance is disconnected on the distributor.

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  • by geek860 on June 18th, 2007

    geek860

    Yodarunner presents some good possibilities but I like to start with the small stuff. Try a higher octane fuel, run a fuel system cleaner additive through the fuel tank, check the spark plugs and check the distributor condition.

    Those are much easier to do than ignition timing or tracing a vacuum line.

    Hope this helps,
    Good luck

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  • by heathertaft on October 7th, 2010

    heathertaft

    I would love to know what solved the problem of the original poster as we also have a GMC Motorhome (77 Palm Beach) with a 455 Oldsmobile Toranado engine and are having the same issues.

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