5.3 Engine Shuts Off

[uncle joe]

I am having trouble with a 5.3 in my z71 half ton.

It started when towing a trailer, the engine shut down as if you turned off the key. When I got it home I was checking the fuses and my son said there was a code showing, this was odd because the mil was not on. The po101 code was cleared with the reader and the truck cranked. It ran a few hundered yards from the drive and shut down again. Still no mil light, but same code, reset and cranked. I am on the third maf now and still have the same problem. I have had bad maf's on other cars and the symptoms were different. It is at a shop now and they get the same thing I did. They are going to check the wires between the maf and the pcm tomorrow, but I don't hold much faith they will find the problem. Before this the truck ran fine. It has 40-50 psi fuel pressure, new fuel filter.

Any one have any ideas??

JE

[superjim]

I thought fuel pressure was supposed to be 60 to 63 psi.

[angelic0-]

I'm shooting for a problem with the immobilizer, might be your key and might be your module..

 

I do not recall the GASSERS to shut down on 10psi lack, they would rather have powerloss issues and a following error in the gauge cluster.

 

A MAF/AFM would act the same, plus a choking sound.

[uncle joe]

if it is the immobilizer it would have to be with the receiver, he has a different key than the one I use. Is this in the PCM or is it a seperate module?