Hi all, I have a question to ask about my 2000 gmc sonoma 4.3. I know it isn't a blazer, but I was wondering if you guys would help anyways.

I've been pulling my hair out trying to figure this out. My truck starts for a few seconds, then dies. The security light would stay on solid after it ran, which I found out means that there is a fault in the system somewhere. I tried splicing the yellow wire to the orange and black wire like many people say, but that did not solve my problem. It allowed me to reset it, but it still starts, but wont run.

I guess it could be fuel pump, but why would the security light be on?

thanks a lot,

Zac

 

Welcome too the Forum! My first thought might have something too do with your ignition switch... Just a guess though. There are far more knowledgeable people here than me that will surely help you out soon.

 

Thanks man! The bypass I described above should have ruled out the ignition switch, but I don't know for sure.

 

Rented a fuel pressure gague, and have 60psi, so that rules fuel pump out.

 

Good fuel pressure from what you posted... I am wondering how the security light thing ties in though??? Maybe some kind of bad sensor? I am a rookie on here compared too most of these guys, so I bet someone will jump in soon and help you out...

 

Went ahead and got a new ignition switch anyways and it didn't really change anything.

at least my ignition is buttery smooth now 😄

 

Have you checked your fuel filter? It will start and run a few seconds you said and then die... Could your fuel injectors be all clogged up? Come on you guys, jump in and help him out, I know you are out there