Quote Originally Posted by GTPpower View Post
Not all NA pcm's work with the gtp map. I dont know if this would help your problem, but you should try switching back to the stock map and see if anything changes.
I just went by the top swap guides. If I remember right I just bought the pigtail for the 2 bar l67 map and plumbed it in like a stock gtp. So what are my options? Maybe I can just the map off vacuum instead of a boost referenced vacuum line? Or should I put the stock l36 map in place of my l67 map?

Why would this cause my issues? Is my pcm getting messed up because it's seeing boost? I'm tuning right now with maf and open loop only, 02 sensor is not activated. How does map even come into the tune? I thought VE tables wouldn't be called, unless I turned off MAF.

Or I could flash a L67 file and copy over my transmission stuff. Using hptuners, do I have to buy more credits to do this? Or could I flash like an 04 impala ss file?


But it kinda maybe sorta makes sense that it would be a map issue of some kind. I get everything dialed in one minute, then next minute everything is off by 6-8%. Really feel like I'm chasing my tail.

Oh, also, don't some boosted 3800's have 2 map sensors? One for baro?