Recently did a v6-v8 swap on 2002 Chevy Silverado. Truck had the 4.3 with nv3500. Wanted to keep 5 speed got every thing bolted up and working. Problems that I am having are truck will not go over 1800-2000 rpm driving and at idle. Just trying to see if anyone else is having this problem and what they did to fix it thank you !

 

What did you do for the tuning on it?

There is an abuse mode in most calibrations that kicks in at 1,800 and will limit everything.

 

did you perform a crank position sensor learn procedure?

 

I just disabled everything in hp tuners that had to do with the auto transmission must of either missed something or turned wrong thing off. So you’re saying I need to disable the abuse mode?

 

im not even sure how to do that new to the whole hp
tuners. I did install new crank sensor

 

even with the previous sensor, it's different than the one in the 4.3
HPT can perform a crank relearn, and most engine swaps need one. my guess is that will help.

 

Post the tune you are working with.

 

sweet appreciate the help ended up getting it changed the abuse mode rpm limiter from 1600 to 7000 rpm fixed the issues

 

did the change on the abuse mode as you said and fixed the limp mode appreciate the help but I can upload the tune tomorrow if u would wanna take a look at it to see what u did wrong lol thanks again