Hello all,
I have a 2006 Saab 9-7x 5.3i with the LH6 5.3 Vortec and I recently encountered the famous P0171 and p0174 codes. I installed a spectra cold air intake and JBA catback exahust a few years ago but never had these codes. About 8 months ago I discovered a few of my exhaust manifold bolts were broken resulting in a slight exhaust leak. These bolts have probably been broken for quite some time before I notice. The performance of the truck never seem questionable during this period of time, made all the right sounds but didnt really go anuy where haha. About 3 weeks ago I decide to change the exahust bolts which turned into kind of a big job but not to bad. I replaced the headgaskets, headbolts, exhaust bolts, exhaust manifolds, gaskets ect. Anyway I have had the HP Tuners software for a few years and used it to turn off DoD and change other things after reading on this forum and others. After all that work I hooked up the vcm scanner to the truck and notice the LTFT where 24.1 for bank 1 and 2. Thinking this was a vacuum leak I bought the better metal intake gaskets, cleaned the injectors with a apparatus I made, changed the upstream O2 sensors and even bought a new intake manifold (thought it had a internal crack). After doing some reading I found that a Cold air intake can cause the lean condition I am experiencing which I did not realize. I think the exhaust leak helped my situation for not having the p0171 and p0174 codes back then. I am trying to get the right advice on how to tune/calibrate the Maf for this issue the right way.
I have attempted to change the the MAF Calibration High and low frequency ( Airflow vs Freq.) tables. I feel this is probably the wrong thing to do but after increasing the numbers about 15-20% the LTFT went to 3.1 left bank and 0 on right back. I took the truck for a drive and it seemed okay at like 15-20 mph but once I give it about 50% or above throttle it falls on its face. I believe something with the VE tables need to be changed but I am not sure. I really dont have much experience with HP tuners and it is kind of confusing, I can do the easy stuff like Dod disable and electronic throttle opening rate and such. Also I did read through the Gen 4 sticky Tuning How-To's, Trailvoy forum and a few others. But do I really need to go through the speed density tuning steps just to dial in the Maf or is there an easier option.