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Anonymous Posted on Mar 23, 2013

95 GMC Seirria W/5.7 runs fine on flat road.

The truck runs fine on the road, moderate speed, flat ground. Apply the throttle to pass, or go up hill and it bogs, lags, or looses power till I come off the throttle, then it pick back up as I aplly the throttle again. Whats up with that?

  • 2 more comments 
  • 2strokeJim
    2strokeJim Mar 23, 2013

    Also check to see if Cat. convertor is plugged

  • Anonymous Mar 24, 2013

    2strokeJim,

  • Anonymous Mar 24, 2013

    2strokeJim, The fuel filter was changed about 6 monthns ago. I thought about the cat, when I had the muffler replaced, I had asked if they could check it. The response I got was "it's still there" so I can say it safe to say that they did not look at it, I won't be going there again.

  • 2strokeJim
    2strokeJim Mar 24, 2013

    try some dry gas, but check fuel pressure and if o.k. I wouls pull your o2 sensors out , 1 on each side and tape them up so they won't rattle around, but that causes an exhaust leak, which lets your engine breath better and then drive and see if it makes a difference, if it does, then I would say your cats are restricted, if no difference then lean towards fuel problem, filter or pump. you will get a service enj light prob. from having o2 sensors out but after you reinstall them you can clear the codes.

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2strokeJim

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  • Posted on Mar 23, 2013
2strokeJim
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How's your fuel filter ?

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No power when going up hill

I have seen many pass though my shop, these are some what known for this ! There's a 95% chance it is your TPS, throttle positions sensor, now the other 5% has also been there Crankshaft Sensor and IAC, are you doing you doing the work yourself ? If you are, it would help if you get a repair manual for your car. Because then you can follow the test for each of these, you would also need a multi meter to test with. On a scale of 1~5 with 5 being the hardest, I would say it's a 2.What you need the repair book for is the voltage to test for on each of these sensors.
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