well heck that would require them to care about something other then getting your money.

 

Is there a good way to test the computer, other than swapping it into a known working truck? (I don't have another truck that I could use)

The computer that came with the truck had an obviously burned trace on the board. I don't see anything obvious on this one.

 

Unfortunately the only real way to test it, is to test it in another truck.

However these computers rarely burn traces by themselves. Usually it's a probably in the truck's wiring that would do that.

 

I figured the burned trace was probably caused by a transistor on the board going nutso and drawing too much current. There should be a fuse on that line anyway, which should have burned before the trace, so it was most likely the computer's fault. Fortunately the new computer didn't burn up, so that's a good sign.

I tried starting with and without the MAP sensor connected (plus the spare MAP that the former owner bought), as well as the engine coolant temperature sensor, and nothing changed. There's always way too much fuel. The O2 sensor shouldn't be an issue with a cold engine because the computer doesn't listen to it until it warms up, so that's off of my list. Is there another sensor that could send data that leads to a huge excess of fuel being delivered to a cold engine? With a cold engine the computer should default to delivering maximum fuel, but this amount is way over maximum. Unless I'm overlooking something, it seems like either the computer is lying to the injectors, or the injectors are sticking open.

Is that pretty much what it comes down to? Since I just replaced the computer, unless I get a better suggestion I'll go ahead and pull the fuel rail and see what the injectors are doing.

 

ACT/IAT comes into play as well. ACT/IAT