Question about 1999 GMC Suburban

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1999 suburban 54.000 miles won't start sometimes and stall at intersections. replaced fuel pump and still happens. After an hour or so of sitting it starts and runs fine. any answers. jfergfh@hotmail.com

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Start with testing your module and coil.

Posted on Oct 09, 2010

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You could have a faulty fuel pressure regulator of a bad CSFI. Here is a link you may interest you to getting your Suburban running 100% again soon.

http://members.shaw.ca/betterthanyoutoo/Sticking%20Poppet.htm

Thank you for using fixya.

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Engine stalls right after start up has fuel press.


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99 suburban wont start sometimes


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.

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