Bad bad bad BAD misfire!

[SLCHOE]

At this point I would be looking at the control circuits of both the injectors and the Ignition coils. Do you know how to test the drivers for those inside the PCM? If you don't know and you do it wrong, you CAN KILL your PCM.

 

[oldsman003]

I do not know what that means. But the truck acted no different with the old pcm installed versus the new one

 

[SLCHOE]

I do not know what that means. But the truck acted no different with the old pcm installed versus the new one

The ECM has the drivers in it so we can rule that out but the control and ground circuits for both IGN and FI must be checked. This is very delicate testing with no room for error. Honestly, take the truck to a shop and pay the $100 to have it diagnosed. I talked about this in another thread about how shops charge $100 to diagnose engine drivability issues and sometimes it takes 20 minutes and sometimes 15 hours. Don't know how other shops work but if WE can't fix it it 99% of the time HAS TO go to the Dealer. Get the answer you are looking for and decide to either tackle it yourself if you can or have it fixed. You've spent way too much time and $$$ on this as far as I'm concerned.

 

[oldsman003]

I've paid the 100 bucks top 1 shop ands another 40 to a private guy and it got me no where farther

 

[oldsman003]

What should I be looking for wire wise in the harness? Burnt wires? The injector wires I've been told if there's a ground issue or had a ground issue can discolor the wires. The pink injector wires are slightly tanish where they used to be pink

 

[#1taho]

What should I be looking for wire wise in the harness? Burnt wires? The injector wires I've been told if there's a ground issue or had a ground issue can discolor the wires. The pink injector wires are slightly tanish where they used to be pink

when mine went I couldn't tell that it was bad. In the end it was loose pin conection's. I changed the harness and that head ach is gone. wish i could be more help, if that don't work I would start to look into a computer or have someone look at the tune in the computer to make sure it's working.

 

[oldsman003]

Fixed

 

[#1taho]

Fixed

That's great what was it ?

 

[oldsman003]

Well evidently everybody I've spoken to, ase mechanics gm mechanics being hooked up to 2 snap on tuners. And nobody told me there is a strategically hidden bank 2 precat. Completely blocked. Broke the flange loose on that side and fired her up and heard those four cylinders for the first time in months
Drove my truck with ease yesterday for the first time in 6 months. Felt great

 

[oldsman003]

Gave Bertha a good wash today to get 6 months of grime off of her, waiting on exhaust now, she sounds like a stock car with open manies!