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
LB

Posted on Sep 22, 2008

  • Larry Sep 22, 2008

    also the fuel regulator could be the culprit

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BUT if you do finally get the codes, here is a bit of info to get you looking at some possibilities;

https://www.accuratediesel.com/pmd_list.html

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