Dan's Build

Dan Carter

I'm bringing my P0606 ECU code story back under my build blog. Received the new ECU and installed it Friday. Downloaded the stock file and sat down to make a comparison to the tune currently on the car. Unfortunately to get to this point, I had 3 tuners do their thing, and each was “recommended”. The first two tunes were questionable post-delivery, because the car never ran right. The 3rd tuner (Ed Gomez, Pro Edge Tuning
www.ProEdgeTuning.com) is the guy Allan uses for all his builds. Ed lives in the NE and travels to do all the tuning for a company in Tallahassee FL that still builds Trans AMs ($184k and up) and I got to visit the company while Ed did some tuning for me (really nice cars). By the time Ed got my tune, the other two guys had made changes, but we had no way of knowing who did what.

The jury is still out on should you/can you change the stock GM throttle table without bricking the ECU, and there is a lot of discussion on tuning forums on the subject (note, GM says do so at your own risk). Anyway, I broke down and bought the HP Tuner reader/writer and even thou I lack the skills to change the tune, I can at least read it, download the tune and run the car to watch the engine data, which has made the purchase worthwhile. BTW you don’t need to buy any credits ($50 each, 2 required) to download tunes, review and record engine data, only to write to the ECU. Now, I found a lot of changes to the tune I have compared to stock, and many probably not required, to include the throttle table. I sent both the current tune and stock files off to Ed, who will review and send back a tune that is his alone without any unnecessary former changes left behind. HP Tuner software lets you review and compare two tunes and visually show the differences for review, a great feature.

Not certain it makes a difference, but I noted that the GM part number for the original LS3/480 ECU and the current one is different (new one is the 331part), but both are listed for the crate motor application. As soon as I get the file back, upload the tune I will start driving again and can report back if the code comes back, which will be chasing a ghost, but I’m hoping all will be OK.

More to follow.

GM keeps changing part numbers on the engine controller and crate engines - the last one I bought was superceded above the prior one - not sure why the effort on their part to do it

Hope it works out; I know how painful it is to chase gremlins and hope like hell the solution of replace everything works!

Ken Roberts

My GM Tech2 scan tool has a section in it devoted to the GM Performance engine control. See if you can find someone locally that can hook one up for you.