from there you need to fail the maf and tune the ve table, then reenable the maf and tune the airflow table. really what you would need to do is start by sorting out the idle airflow (likely need to adjust the throttle blade a little) and it will likely start and idle a lot better. the reality is there is a small amount of them you need to work with to sort your issues out. Hptuners isnt that difficult to work with, its just very intimidating because there are so many tables. it only takes 2 hp tuner credits to unlock your pcm, thats $100 to unlock it, not $400. if you didnt already have a swap harness and a pcm id lean towards aftermarket, but a stock pcm is more than capable. Seeing as the car is already up and running on a stock pcm id keep working with it. If the recommendation is to tune the stock PCM, does anyone have a recommendation for a tuner? Thanks, Gil K&N cone type air filter with MAF sensor in the intake tube about 15" from the throttle body Sensors and ignition coils from the 2003 Trail Blazerīrian Tooley Stage II truck cam (In. My question to you is should I spend the $400 for credits and tuning on my stock PCM or should I purchase one of the aftermarket PCMs such as the Holley unit for about $1000?ĥ.3 LM4 long block from a 2003 Trail blazerĪll external components (intake, front end accessories) from a 1999 Firebird LS1 We have no one in our area that I could take my car to that I would trust to make my car right. I understand how HP Tuners works (it's very complicated) and it would take me months to figure it out so I don't want to attempt to tune my PCM for my self. I have a friend who has HP Tuners that I can borrow and I planned on using HP Tuners for the medium to store and send the information from my PCM to a tuner. It bucks at low speeds, you have to put your foot on the gas when you start it and eventually the IAC will take over, the tach reads double, etc. It runs OK but it has several annoying driveability issues that need to be fixed by tuning the PCM. I have a list of things I need to do to make the car 100% finished and one of the most important items is to get it to run correctly. I have driven my 5.3 LM4 conversion in a 1988 944 for about 3000 miles since last year and now the goal is to make everything "right".
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