Question about 1999 GMC Suburban

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99 suburban wont start sometimes

158000 miles, 15004x4 350. weather cold or hot, sometimes the truck wont start. After letting it sit for a few houres it starts up with no problems. No check engine light.

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  • tzeetank Jan 02, 2009

    Fuel pump is running.

  • Anonymous Mar 15, 2014

    won1t start every time cold or hot when starts runs rough fore a minite

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I had a similar ongoing problem with my 1999 GMC Suburban C1500, it occurred only in the hottest days of the Texas summer. In addition to not starting, the truck sometimes exhibited symptoms of misfiring while driving at highway speeds, as if the engine seized or as if there no fuel being delivered to fire.
I found a small garage mechanic who swore he could fix it after years of taking it to the dealer and other franchise repair shops and getting the same answer "we can't find anything it like you described, it won't do it while we're testing it, bring it in right away so we can get the history codes....blah, blah, blah". I always thought it was due to an intermittent electrical grounding issue. Anyway, long story short, the small garage mechanic was guessing a lot of the time, but after changing the fuel pump, the sending unit, fuel injection system and many return trips to the garage with me saying 'that wasn't it, it's still doing it" it finally turned out to be a faulty wiring connector link in the harness assembly ABOVE the FUEL TANK that came from the pump or sending unit. When it got hot the link would melt and create a short, when it cooled a bit it would still conduct. We replaced the wiring connector and 4 years worth of unexplainable intermittent starting problems disappeared. I spent $2K to $3K over the years, when it finally turned out to be a hidden $12 wiring connector.

Good Luck.

Posted on Jan 18, 2009

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Listen to see if fuel pump is running

Posted on Jan 02, 2009

  • Kelley Duncan Jan 02, 2009

    Listen to see if fuel pump is running

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