Another overboost thread (different from the other one)

[GTS]

What year truck? The '94-'97 trucks won't set the code or defuel until the 35+psi range.

[Pocket]

Originally Posted by GTS

What year truck? The '94-'97 trucks won't set the code or defuel until the 35+psi range.

Mine is a 2002

[Shaw]

I remember reading a while ago about the issue you are talking about pocket. I think it was TDS or maybe PSN. I think it was the thread that Matt came up with a different Map sensor that gos to 3 bar instead of the 2.5 bar or something like that?

[cleatus12r]

There are a few things to look at and from what I have seen and had to deal with over the past, you may or may not be able to "fix" this. Here are some hints anyway:

Turn off the MAP enable switch. This will cause your boost/fueling to follow the inferred boost map.

Change the MAP operating range high to "1023". To go with this, you can change the MAP transfer function as well.

Heck, if you get so inclined, there are quite a few MAP and EBP maximum pressures and time parameters you can raise as well.

[Pocket]

Originally Posted by cleatus12r

Turn off the MAP enable switch. This will cause your boost/fueling to follow the inferred boost map.

This I have not tried. Reason is I wondered how it would affect high altitude driving. But..... I see a test in my future.

Originally Posted by cleatus12r

Change the MAP operating range high to "1023". To go with this, you can change the MAP transfer function as well.

This was the next thing I was going to try. I already changed it in my tuning, just haven't punched it yet to see if it works.

Originally Posted by cleatus12r

Heck, if you get so inclined, there are quite a few MAP and EBP maximum pressures and time parameters you can raise as well.

Those I have messed with. In fact, I have no EBP codes that pop up.... ever. It's just weird how there's more functions to control the EBP error codes than there are for the MAP sensor overboost. It was easy for me to kill off the EBP sensor, and I thought it was just as easy for the MAP. Guess not. Oh well.

Thanks for the info. I'll report back on what changes work when I get a chance to test them.

[soutthpaw]

Did you try the MAP disable switch? if so what were your results at altitude. I do occasionally get this code too. I tried the third one but not the second suggestion yet