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  1. J

    2013 Denali poor acceleration

    Fuel mileage really has not changed. I don't think the scanner does alcohol %. Always using regular gas. I wonder why it has never thrown a misfire code? Once you get above 1500+ and stay there......no problems. When you slow down and try to accelerate gradually it happens. Almost like the...
  2. J

    2013 Denali poor acceleration

    I have a scanner by foxwell. Fuel press at the rail is in the 40's. The fuel trims are all approaching zero. I was thinking of the throttle body position sensor but wouldn't it throw a code?
  3. J

    2013 Denali poor acceleration

    Update, I changed wires and plugs. One of the wires was broke. However it never did throw a misfire code??? It seemed to run ok for a couple of days. Then it went back to previous symptoms. It runs fine as long as you are giving it throttle, like on interstate or accelerating. But when...
  4. J

    Media not supported?

    I have a 13 Denali. I have been using my iphone 13 pro by plugging it in the console usb. It works and sounds great. However when I try to use my wife's iPhone (same model and iOS version) it says media not supported. Any help appreciated.
  5. J

    2013 Denali poor acceleration

    2013 Denali XL with 250k. Upon cold start there is some rough idle and missing when accelerating. It seems like it even affects the shifting. I found p0172 & P0175 as well as p0101 (mass air flow). I cleaned the MAF and the dash light went off and it seemed to run much better for about one...
  6. J

    Knock sensor P0328

    Sorry for late update. The place or person that did previous maintenance on the vehicle did not do a good job. The motor mount was replaced but was not tight and they pinched the knock sensor harness wire. I installed a new one and now that problem is solved. Thanks for all the help here!
  7. J

    Knock sensor P0328

    Thx for the reply. Does anyone know the part number for the AC Delco harness? RockAuto doesn't carry it. On their site it says the AC Delco sensor mates with PT2652 but when you look that up it says doesn't fit your vehicle. RockAuto carries a Standard Motor Product brand of connector.
  8. J

    Knock sensor P0328

    Anyone have a pic or diagram of where the bank 1 knock sensor harness leads to?
  9. J

    Knock sensor P0328

    Ok I dug into it tonight. It could very well be the wire or the harness. The problem is access. The wire from the harness is wedged between block and whatever. Anyway there is not enough slack in the harness to be able to get my hands on it to check. Also since it is wedged I can’t wiggle or...
  10. J

    Knock sensor P0328

    Thx for the reply. The sensor is in a bad spot to get to. I did spray electrical cleaner on it. I suck at electrical issues. I do have a multimeter. How can I check it?
  11. J

    Knock sensor P0328

    Ok, so oem are you referring to AC Delco and Delphi?
  12. J

    Knock sensor P0328

    There seems to be quite a bit of discussion on oem or not?
  13. J

    Knock sensor P0328

    Thanks for the reply. I used a Carquest sensor and did not change the connector.
  14. J

    Knock sensor P0328

    Hey I am new to site. I recently purchased 2013 Denali XL with 6.2L. It has been hesitating (basically running like crap when at 1500rpm or less). It threw P0101 and P0328 codes. I cleaned the mass airflow and the throttle body. It ran great for a day then the P0328 came back and with the...

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