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1999 Tahoe 5.0 Very hard starting, sometimes requires starting fluid to get started. once started runs fine. Has had a full tune-up, new fuel filter. Fuel pressure has been checked and is ok. 2 different mechanics and problem still exists. now they recommend a new computer, but say they can't be sure it will fix the problem. Any ideas?

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The most common cause of this condition is the check valve in the fuel pump failing, to check this hook up a fuel test guage to the fuel rail test port, run the engine for a moment and shut it down, after shout down the pressure should stay within 5 PSI of the pressure at shut down after sitting overnight, if it doesn't then the fuel pump must be replaced, the reason is the fuel drains back to the tank if the valve is defective, so you get air and no real pressure on cold start, A check of pressure on a hot running engine will not show this fault, also make sure you are usine the correct Octane of fuel, Prem fuel in a regular fuel engine will cause cold start and stalling issues in cold weather.

Posted on Nov 29, 2008

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