The sensors all seem to work. I cleared the light. Also had the battery disconnected for an extended period of time. Tried to run it again. Still runs bad, and after a couple attempts at starting it, the light came back on with a P0106 code.

 

Did you put in OEM sensors?


Try the MAP testing procedure here....
https://www.obd-codes.com/p0106

 

That write up implies I have schematic or pinout information for my truck, which I do not. Any ideas where I might find the schematics for the engine wiring?

 

charm.li

 

Thank you for that. I'll return when I have more information.

 

MAP sensor is original. Figured there wasn't a problem with it when it returned a signal while looking at the live data.

 

I have a hypothesis on how my problem came to be. I was able to do spark tests on all of the coils. 2 of them (cylinders 7&8) will light the tester, but the light isn't as strong as the other 6 cylinders. My guess at this point is that the misfire on those 2 cylinders have changed the MAP signal enough for the ECU to decide it isn't happy with the MAP sensor. I may be going out on a limb with this hypothesis, but at least you can see the mental gymnastics I used to arrive at this conclusion. Please feel free to confirm or deny my hunch.

 

The MAP value has nothing to do with misfiring or what goes on inside the cylinder.
What were the results of the MAP test?

Two weakly firing cylinders shouldn't prevent the engine from starting, but try swapping the plugs/coils around and see if it changes.

 

As of yesterday, the engine will start, and high idle. It just runs like garbage. It'll die when it tries to idle down.

 

Mmight be the cat. Converters in the exhaust