DTC Codes after Hypertech Instillation
Thread Starter
1st Gear
Joined: Nov 2007
Posts: 1
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DTC Codes after Hypertech Instillation
I recently installed the Hypertech Powerprogrammer III program into my 2002 C5 Corvette and continue to get 2 DTC codes that say "left & right bank running lean". I have a couple of aftermarket bolt on parts (B&B Triflow Exhaust, Halltech Coldair Intake, and a Performance Mass Airlfow Sensor). Any suggestions on what maybe causing this or what I can do do fix the issue?
Thanks in advance for the feedback.
Thanks in advance for the feedback.
Heel & Toe
Joined: Jul 2007
Posts: 19
Likes: 0
I recently installed the Hypertech Powerprogrammer III program into my 2002 C5 Corvette and continue to get 2 DTC codes that say "left & right bank running lean". I have a couple of aftermarket bolt on parts (B&B Triflow Exhaust, Halltech Coldair Intake, and a Performance Mass Airlfow Sensor). Any suggestions on what maybe causing this or what I can do do fix the issue?
Thanks in advance for the feedback.
Thanks in advance for the feedback.
Drifting
Joined: Dec 1999
Posts: 1,541
Likes: 2
From: Raleigh NC
Your mods will cause your car to run on the lean side. Not a huge deal because the PCM will compensate. Now you flashed with Hypertech which probably adjusts the PCM to run a little leaner for power. The computer can only adjust so much. You need to get a real tune. For about double the price of the Hypertech you can buy HPTuners or EFILive and see what's being changed and then monitor for lean/rich conditions.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
I would deff. blame the aftermarket MAF--If you are throwing lean codes it means that the LTFT corrections are over +/- 25%--I would put the STOCK MAF back on--They are good for 500 HP and all you hear are horror stories with aftermarket MAF's---you can calibrate an aftermarket one to work and will gain small amounts of HP but we're talking maybe 3-4 HP--Not worth the effort or the trouble--Also they raise hell on you auto trans if you have one as well--
If you had the MAF on before the hypertech tune and had NO codes but have them now--it's because the LTFT's always re-set themselves after downloading a new tune and the comp will have to learn out the trims--usually takes 50-100 miles--If the trims drop below +/- 25% then the codes will turn off--but you should still get it tuned by a tuner as they will still be to far away from the optimum "0" LTFT fuel trims
If you had the MAF on before the hypertech tune and had NO codes but have them now--it's because the LTFT's always re-set themselves after downloading a new tune and the comp will have to learn out the trims--usually takes 50-100 miles--If the trims drop below +/- 25% then the codes will turn off--but you should still get it tuned by a tuner as they will still be to far away from the optimum "0" LTFT fuel trims
