Question about 1999 GMC Suburban

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99 GMC K2500 Suburban 4x4 Hard (Slow) to Start When Hot

The vehicle has 120,000 original miles. First thing in the morning it starts and runs like a champ. If I drive to town and park while shopping, etc. it turns over several times before starting and sometimes backfires when it starts up. It has never failed to start. I have recently had the O2 sensors replaced, the valve cover gaskets etc. replaced, and the injectors flushed and pressure tested for leak down. The repair shop has checked all the sensors/circuits for potential causes, and they have reloaded the software in the computer. The computer has not been replaced. The repair shop has focused on electronic issues up to this point.

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I know this may look a bit obvious, but check also air intake and air filter.

Posted on Jan 23, 2009

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Welcome to Fixya! It sounds like the Starter Solinoid is getting too Hot and needs a New Starter Shield Installed. This truck is Throttle Body Injected Correct???? Try also Replaceing the Fuel Cap. You could have a Bad Seal on the Fuel Cap allowing Air to leak into the Tank. Also, Get the Fuel Filter Changed and get the Fuel Pump Checked out. It is one of these Causing the Problem. Your Computer is Fine.

Posted on Jan 21, 2009

  • Travis Humphries
    Travis Humphries Jan 21, 2009

    Has the Mechanic Reset the Timing with his Repairs????

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Back firing indicates a timing issue... have you been able to pull any codes from the computer ... that would help alot in troubleshooting the problem... also what is the climate you drive in... extreme winter.... very hot ?

Robert

Posted on Jan 21, 2009

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Check wit the starter there might be rust in it 
it cause in delay start

Posted on Jan 21, 2009

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It could be in the timing..you may be ready for a new timing chain and gears

Posted on Jan 21, 2009

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