Question about GMC C2500

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I have a 1994 GMC Vandura 2500 5.7L conversion but it has a lot of trouble pulling a small 21' travel trailer ... not enough power ... why?

The trailer is a 20RD Catalina about 4000 lbs and the engine has 282,000 miles on it bu runs and idles smooth and burns very little oil ... what could be the problem ???

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  • 1 more comment 
  • ljearls Apr 17, 2014

    Dennis: This is the van and Rv ... when I say the van has trouble, I mean I can barely keep it at 50 mph ... I have Overdrive/Drive/2nd/1st gears on always keep it in Drive but 50% of the time it down shifts into 2nd to stay at 50 mph ... do you still think it might be a transmission slipping problem ???

  • yadayada
    yadayada Apr 17, 2014

    I did not say it was a transmission problem, just said it was just one of many things that could be wrong. But by the look of the van and trailer i think it is overloaded.

  • ljearls Apr 17, 2014

    Dennis: Thanks again for all your time and comments ... I have discussed this with my local mechanic ... if I ever figure out a solution I'l let you know.

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  • GMC Master
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Worn out engine.

Posted on Apr 16, 2014

Testimonial: "I have considered that the engine is worn out, but it burns little oil and idles/run smoothly ... I guess a compression test on each cylinder would tell me a lot more."

  • 6 more comments 
  • yadayada
    yadayada Apr 16, 2014

    Runs smooth just means the engine has worn evenly, consider this, the cam and lifters wear down, the result loss of power but engine run well. At the very least the valves must have some leakage around the seats after all these miles. Also verify the injectors are ok and that you have good plugs wires, if they are old then replace them with a high quality replacement like ACDelco.

  • yadayada
    yadayada Apr 16, 2014

    If you decide to change the engine use a high quality rebuilt, they are very cheap compared to other car makers replacements. Check this site for prices www.rockauto.com

  • ljearls Apr 16, 2014

    Your points are well taken ... I guess I just can't believe it's struggling so much with a small trailer.

  • yadayada
    yadayada Apr 16, 2014

    Are you sure you have no transmission issues, is the fluid clean and not burnt smelling?

  • ljearls Apr 16, 2014

    I haven't noticed any transmission issues ... it seem to shift and down shift appropriately ... but the transmission fluid looked darker than normal after the pull this past Monday.

  • yadayada
    yadayada Apr 16, 2014

    You may have slipping going on

  • ljearls Apr 16, 2014

    I'll have the transmission checked.

  • ljearls Apr 16, 2014

    You don't think he gear ratio in the rear-end would make that much of a difference ???

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