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  1. F

    Trans acting weird

    Flushed the fluid today. Nothing abnormal in the pan. Didn't cut open the filter. Fluid was dark, but that was expected with the temps I've been having.
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    Trans acting weird

    I'll try it and report back my findings
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    Trans acting weird

    No codes at all. Just serviced the trans last summer, and the day after I posted this thread.
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    Trans acting weird

    Still having an issue. Trans is just acting funny. When ever I go from a gear like R to D or D to P the engine will rev up for a moment and come back down. Also seems like the shifts arent at the right times
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    Trans acting weird

    I'm going to flush the entire system tomorrow and report back. Just wondering if this was a limp mode thing. I had no message in the DIC or a check engine light. Just elevated temperatures with my trans and coolant.
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    Trans acting weird

    It was not slipping at all. I just had zero throttle while in gear.
  7. F

    Trans acting weird

    When it was hot all weekend, No I could not rev the engine at all in gear. Today it's just fine. Was wondering with the hot temps if it goes into a limp mode?
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    Limp mode? Starting in 2nd? TC locking in 1st?

    did you ever figure this out?
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    Trans acting weird

    bump
  10. F

    Salt Deposits Under Floor Mat, BRUTAL

    West Bend, WI here.
  11. F

    Trans acting weird

    2003 Yukon XL Denali. Was towing my camper and noticed the truck had no power. Put truck into reverse and it wont move. Almost like theres no throttle response. Put it in Neutral and have response. Trans was around 210. Was 97 the last couple of days. Let truck cool down overnight and it was...
  12. F

    p0420 help

    It has since then gone away and not come back, I did the work myself. I will scan it tomorrow and just see what the sensors are doing, but I have seen a huge improvement in performance and power as well as no more flashing check engine light.
  13. F

    p0420 help

    Replaced the cat today. Noticed a bit of a power gain. It doesn't run any smoother but I did get a P0137 code now.
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    p0420 help

    Replacing Cat tomorrow. Will report back with what I find.
  15. F

    p0420 help

    That's what I'm thinking. Can I use a spark plug non fouler to trick the rear o2 sensors?
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    p0420 help

    Tune up was just done about 5k miles ago. I replaced plugs, wires and coil packs. The side with the misfires is the side that I have the P0420 for.
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    p0420 help

    Here's what I found on my scan. Cold STFT Bank 1 0-2 at idle. Bank 2 0-2 at idle. LTFT Bank 1 9 at idle. Bank 2 10 at idle. MAF 6.2 MAP 11.2. All of Bank 1 has misfires in the history. Once the truck warmed up STFT Bank 1 -5 to 0. Bank 2 -4 to 0. LTFT Bank 1 was 5 and Bank 2 was 6.
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    p0420 help

    Thank you, I'll check it out.
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    p0420 help

    Can I use an O2 simulator as a temporary fix?
  20. F

    p0420 help

    I know what to look for, but IDK what good and bad numbers are.
  21. F

    p0420 help

    I can view basically anything with my scanner, the problem is I don't really know what I'm looking for.
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    p0420 help

    Can anyone tell me what I'm looking for while I look at the data for my Yukon? What should my fuel trims be? 02 voltages. What should the wavelength look like for the 02? Bank one sensor 1+2 both have the same wave. Bank 2 1+2 have different waves.
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    p0420 help

    The flashing CEL goes away. It only flashes in the 2400-3200 RPM range.
  24. F

    p0420 help

    It seems like it runs perfect. I can't feel a misfire at all. But I'm going to order a cat and install it next week.
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