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  1. M

    Reconsidering my order

    They like financing, they make more money on you then. I drive by lots and fields in the Flint, MI area full of trucks just sitting waiting for that chip that has become hard to get. Yours is probably sitting in there.
  2. M

    Persistent P0420 and P0430

    Another ostrich
  3. M

    P0420 and p0430 after dod , performance parts and tune

    I've worked for 3 OEM's and honestly, GM is the best one when it comes to making things work and be simple. I've worked with a lot of very intelligent people, and although there are some lazy engineers, GM had the most good ones, 9 out of 10 I would say and I have no problem telling you where...
  4. M

    P0420 and p0430 after dod , performance parts and tune

    The catalyst diagnostic measures O2 storage of the converter. The high flow ones obviously don't store much. This measurement is done at idle after the cats are hot and some air flow has gone through them. The fuel mixture is sent rich (or lean). The front sensor will read high (or low) and the...
  5. M

    Unleaded Gas type -2021 GMC Yukon Xl

    GM has high and lo octane tables. Spark is taken out quickly to prevent knock and returned at a slower, calibratable, rate. Tested at high and low altitudes and hot and cold, high and low humidity conditions. Local tuners create a custom cal that works in your area only.
  6. M

    Persistent P0420 and P0430

    It was purposely built the way it was for a reason you wouldn't understand. Hard to hear when your head is in the sand. Instead of spending millions of dollars doing research and testing, I'll just call you, ROFLMAO.:2cents:
  7. M

    Unleaded Gas type -2021 GMC Yukon Xl

    Your knock sensors work.
  8. M

    Persistent P0420 and P0430

    If it flows more or less than the one it came with, the table, and your fuel trims will be off even with paper. With oiled, when you clean and over oil it, you get oil on the MAF and throw it way out. When you use one of GM's (or anyone's that requires you mount the MAF) 'cold' air kits, where...
  9. M

    Persistent P0420 and P0430

    Depends. Look at your fuel trims before and after. My 3 engineering degrees and 22 years at GM tuning those tables and doing air flow test on filters disagree with you. I did MOPAR's too by the way. It works on theirs because they haven't figured out how to use a MAF sensor yet and still use...
  10. M

    Persistent P0420 and P0430

    Absolutely true. The MAF measures an electrical signal. Explain how it takes an electrical signal and converts to an airflow value. That is what the table does, and it is based on the flow of the filter. I did many of these in the car and on a flow bench at GM.
  11. M

    Good Old Random Cylinder Misfire Mystery

    Based on what you had going on, yes, although it will learn itself eventually. There are several cells that contain the learn fuel trims for various driving conditions. Idle, cruise, accel, decel, etc, and all those with AC on and off and with purge and no purge. Each time you enter that...
  12. M

    Persistent P0420 and P0430

    "New K&N panel with the excess oil wiped off." Is this a KN air filter? If it is, that is the problem. The programming is set up to model the air flow of a production filter. When you put the KN ones on, you need to adjust this model. Sometimes it won't even start like in the case of the 55...

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