Question about GMC G2500

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Having a lot of trouble starting truck when it is warmed up. Have recently changed the PMD & isolated it but this has not helped.

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Generally when this happens it's because your eger valve is stuck open. this is your exaust gas relief . when this is stuck open your fuel air mixture is not enough to get combustion inside the cylinders. your fuel system is based on ceratin pressures and the TPS(throttle position sensor)O2(oxygensensor)fuel pressure regulator,and egr all work in conjunction through the ECM(engine control module). replacing the the egr valve will take car of the problem. it is an easy do it your self and the replacement part can be purchased at a autoparts store. please rate this...thanks

Posted on Sep 22, 2008

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Yup thei is usually caused by the o2 sensor ..... go to an autoparts store they can check if it is in open loop or closed via the pcm
This is a common issue for 02 sensors ,,,, I love my chevys

Posted on Sep 22, 2008

  • Larry Sep 22, 2008

    also the fuel regulator could be the culprit


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Found this online: GM Technical Service Bulletin #77-63-06Ab states that: "stalling, hard starting, and hesitation are symptoms of a failing PMD (Pump Mounted Driver) module." These symptoms usually (but not always) set a code 35 or 36 in the 1994 - 1995 models, or a code 1216 in the 1996 - up models. Often when this problem is diagnosed at a dealership or repair shop, the customer is told that the injection pump needs to be replaced. But in most cases, the PMD module can simply be replaced for a fraction of the price. ds4chevyfsd.jpgThe PMD module, (also referred to as the "Fuel Solonoid Driver") has been a major problem for Chevy / GMC 6.5L diesel owners since the introduction of the 6.5L electronically controlled DS4 fuel injection pump. It has been determined that heat is the primary cause of PMD failures. The PMD is mounted to the side of the fuel injection pump from the factory. But the injection pump does not provide adequate cooling to keep the PMD functional. Once the engine begins showing symptoms of hesitating, stalling and hard starting, the problem will only worsen with time. The problem only becomes more serious when considering the potential danger of your engine stalling in a situation such as pulling into heavy traffic or descending a steep hill and losing the use of power brakes and steering.

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the stock location of the pmd is on the side of the injector pump. if you stand at the front the vehicle look and the middle front top section of the motor right where the drivers side of the intake manifold starts to rise you will see it

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