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1991 GMC Rally Wagon 3500

Question: NEED TO KNOW OF KNOWN BULLENTINS? PROBLEMS? GOING ON A LONG TRIP.

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van3500, 7.4L V8, Temecula, CA, January 10, 2011, 19:32
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SOME TIME IT HAS HESITATION? PLANNING A LONG TRIP,WOULD LIKE TO KNOW WHAT MIGHT HAPPENED,SO I CAN DEAL WITH IT?

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  • Answer #1

    DaveJHM January 10, 2011, 22:16
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     Master

    Hesitation - can be due to a vacuum leak, an air intake leak, a throttle body that needs cleaned, an EGR system issue, or a fuel pressure issue.

    The best thing you can do preparing for a long trip is have a qualified technician evaluate the vehicle's condition. This will give you some insight as to what you may need to be prepared for.

    Technical Service Bulletins help technicians diagnose "common" issues, but are not a listing of issues you can expect to have.

    My suggestion is to review the vehicle page on RepairPal (http://repairpal.com/cars/gmc/rally+wagon+3500) and look at the common reported information there. It will give you some information that you can maybe use. Checking the vehicle is more important, overall, however. Good luck and safe travels!

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    van3500, January 11, 2011, 11:48
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    THANK YOU! THIS VAN USE TO BE AN LA DISTRICT VAN SO IT ALSO IS A CNG!!! i'M TRYING TO GET AHOLD OF THE CO. THAT DID THE WORK!! HOPE THAT HAS GOOD RESULTS ASWELL!!

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    DaveJHM, January 11, 2011, 20:39
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    Oh my goodness -- CNG? And you're going on a trip? Your biggest issue may be locating fueling stations along the way. Being in the LA area is one thing; where are you headed to?

    Hesitation on a CNG can be other things. I'm not a big expert by any means on CNG, but I can say that in my limited exposure, i've seen a ton of low mileage spark plug replacements. I believe they get fouled or damaged easily by the characteristics of the natural gas. What you really need is to find a solid specialist who understands the concept and principles of CNG operation. You don't have much company out there as an end user with a CNG product. Good luck.

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, January 10, 2011, 22:52
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    great answer by Dave. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info or there is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://bit.ly/mitchell_repair_manuals_online
    and get an online repair manual subscription.

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