Question about 1999 GMC Suburban

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P1345 misfire/stall/no start

Sounds like a misfire when i am driving down the highway, and now it is seemingly cutting out. got code P1345, i have tested the crank sensor, fuel pressure. motor was replaced recently. PCM and body control module was replaced and reprogrammed by the dealer. sometimes it starts fine. others it will take me 10 minutes of tinkering to get it started (and i dont think its anything i did to make it start) could this just be off its timing, or should i look at replacement of the cam sensor/distributor?

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  • luke Apr 28, 2014

    found the issue. the connections for the fuel pump relay had gone bad. after replacing that the truck worked beautifully again

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  • GMC Master
  • 5,642 Answers

Could be the cankshaft sensor.

Posted on May 24, 2017

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Posted on Jan 02, 2017

roniecon
  • 6826 Answers

SOURCE: 02 gmc sonoma 4.3 engine starts and runs great for

Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

Posted on Jul 11, 2010

  • 7353 Answers

SOURCE: 2000 GMC Jimmy, starts up

you say fuel pressure is good, but what is it? what is the fuel pressure when it stalls out? Spec is 60-66 psi and it wont run if its 55 psi. the fuel pump relay should be good if the pump runs. Make sure the ground for the pump is good , G402 should be on left frame rail. you may have had it off to replace the pump? maybe? it may be time to stop guessing and have a repair shop diagnose it for you. You sure have replaced a lot of good parts.

Posted on Sep 07, 2011

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Vam stalling


there are too many reasons...

it could be fuel pump,, it could be ignition coil overheating, it could be the computer itself...

you need two things for the engine to run,

1 is gas
2nd is ignition,,

with these two misfiring or your loosing one of them, it will stall...

i hope i was able to give you some thoughts....

drcool

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