I'm surprised nobody has mentioned this yet.

you have an OUT OF RANGE (OOR) value in your tune.

This will make your pcm do wacky and unpredictable things. I've never seen this issue on a stock 1 bar MAF tune, but it happens on the 2 bar COS tune until corrected. It caused my timing to be low and erratic until I fixed it.

 

Try this now:

 

Im not sure if its the same or not, but on my old '00 PCM Justin did an '02 OS upgrade on it. Since HPTuners cant do that I had to get a new PCM that was supposed to be an updated '02 PCM so the shop doing my cam could get the truck running.


And depending how the weather is over the next two days, I should have a current log soon too.

 

Is the 'normal mode' and 'performance mode' in the trans settings the tow/haul?

 

Yes.

Did you upload the tune I posted?

 

I haven't uploaded anyone's tune yet. Waiting to see what Justin sends me first, plus I wanna get a data log file up as well.

 

Well I got a nice long data log today, but the site says the file is too big for me to attach. Its like 784KB of data so I don't know how to upload it for everyone to check it out.

 

you'll have to compress it

 

Ok, how do I do that without losing any data?

 

Here's a screen grab from the data log. Same screen, just the points shown are at the 2-1 downshift and the 2-3 upshift.

downshift


upshift