Question about 1999 GMC Suburban

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Starting Problem 1999 GMC Suburban, 1500

It started as a intermentant problem were the vehicle would start, run for about two seconds, and stall. The problem is now to the point where I can not get it started at all. It use to start after about 30 attempts, but now it will not go. Just does the same thing; starts, runs for 1-2 seconds, stalls. It has a 5.7L engine, normally aspirated. The fuel filter was recently replaced in an attempt to solve the problem (It did not).

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  • lw_weger Nov 04, 2008

    I bought a fuel pressure gage kit and checked the pressure against the service book I have, and the fuel pressure is within tolerance. The vehicle is running again, but I can't say what the problem is. I do know (now) that the vehicle will not run properly without the air filter housing attached to where it can draw air through the MAP sensor - I tried to start it without it in place; it did start but ran poorly until the venting/housing was back in place. Still an intermittant problem.

  • Anonymous Dec 11, 2008

    On 1999 suburban 1500 2WD 5.7 engine turns over fine, starts, runs for 1 second, then quits. If I let it sit for 30 minutes, it will start fine and run fine. The problem recurs without warning. If the fuel pump needs to be replaced I do not see this as a "very easy" job because the fuel tank must be removed!

  • lw_weger Jan 06, 2009

    I got ahold of a OBD-II code reading and pulled a code stating a problem with the security feature, code P1626. This makes sense. When the suburban has this problem, I can keep it running by either injecting starting fluid, or using the pressure relief line on my fuel pressure gauge tool to inject gas into the air inlet. The fuel pressure is within tolerance, it's just that the injectors are shut off shortly after start. My research on the PASSLOCK security system indicates the vehicle shuts down for 10 minutes if key tampering is detected. Indeed, the "SECURITY" light stays on, and did not turn off after 5 seconds with the key in the "RUN" position. The problem is most likely a intermittant failure of the contact in the ingnition switch responsible for this signal.

  • lw_weger Oct 24, 2013

    For those reading this post, it was the PASSLOCK security system. I had to have the computer for the security system replaced by the dealer. Sorry that I do not have a better solution for this issue.



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Turn the key to the on pos. and listen for a huming in the rear of the car as your fuel pump is in the tank. if you don't hear it then i would say that the pump is bad and need to be replace, but if you hear it it could be weak . try takeing off the air cleaner and spray some quick start down the intake and try starting it . if it start i would replace the pump . very easy to replace.

Posted on Nov 04, 2008

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Try the crank sensor or the ignition control modual. but check your cap and rotor first

Posted on Dec 22, 2008

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Check the connections on the oil pressure sending unit, or the sending unit itself. The sending unit moinitors oil pressure, but also supplies power to the fuel pump after the 3 second timing sequence after startup. As a safety feature, If it doesn't detect oil pressure, or if the connections are open, it'll kill the fuel pump and in turn, stopping the engine.

Posted on Dec 15, 2008

It is the pump relay causing the problem

Posted on Nov 10, 2008

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