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  1. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    There is no doubt that even Gen V DI engines can run smooth as butter, but there are also many that rough idle all the time.
  2. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    False positive on the cleaning MAF and MAP, drove quite a bit today and same old shaking flutter trembling is as bad as before. Not sure why it was better for a brief period but cleaning did not help.
  3. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Yes I have ordered the new MAP it just takes some time to get it. I have cleaned the existing MAP for now. Sent from my iPhone using Tapatalk Pro
  4. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    No kidding, I will clean TB at this point by taking it off the truck. I bought new gasket for TB as well just in case. This Gen V are Throttle by Wire, so I will be the guinea pig for this forum. Maybe I should do a video to recoup some of the money I wasted trying to fix this truck while it is...
  5. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Did you see molybdenum coating of any kind on the butterfly? Was it damp with water or damp with TB cleaner?
  6. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    did you open with your fingers or turned ignition on and pressed the pedal to open it?
  7. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I have idle raised all the way to 650 now but skipping/miss is still there when engine is fully hot. It is a bit worse on Exxon 89 but my truck seems to like BP 89 or BJ's 93 best. This is not scientific at all, just what I feel. Throttle body clean seems to be the natural exploration but dealer...
  8. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I did pay because they told me that in absence of codes they have nothing to repair under warranty, shaking is within spec per GM, less than 2 gram on a Picoscope. Bottle test is proving nothing to them. I took to Arbitrage and lost, per arbitrator vibrations are not dangerous and truck did not...
  9. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I want to attempt throttle body clean but since this is drive by wire Gen V, horror stories are all over the Web. There are no how-tos for Gen V DI engines to clean TB and re-learn idle position. I suspect nobody in the right mind needs to clean the TB on the Gen V trucks but since I am doing...
  10. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I paid $1200 for dealer to install both engine and tranny mounts replacement, and he took time to properly reseat the mounts after the replacement.
  11. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I see, thank you. throttle body was cleaned with CRC DI engine throttle body cleaner following their process 4K miles ago, it looked clean before cleaning but I still cleaned since CRC explicitly states does not void manufacturer's warranty. As for injection cleaning, I only did in-tank...
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    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Thank you, here are the answers: 1) The top graph smoother curves was at driving speeds (driving 1800+ RPMs) with the a/c on. The bottom graph was still in D but stop (±500 RPMs) at the traffic light. In Park is about the same - not smooth. Same behavior with a/c on and off. 2) What does RPM do...
  13. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I am new to GM V8s is there a tutorial for Gen V belt removal? Thank you.
  14. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I have done a bit more highway driving and then ran the engine at the traffic light stop in D with AC off (did not take the belt off, just turned off the AC) and the vibrations/flutter was still there, maybe to a lesser degree but certainly did not stop when I turned AC off. Harmonic balancer...
  15. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Got it, will do today and report back if I find anything.
  16. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Thanks. Is there a test of any kind to check if compressor or its clutch is at fault?
  17. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    I think vibration was less during the cold season with AC off. Now that heat is here it is prominent. Is there a way to test the AC load and clutch? Could electrical AC fans cause vibrations if they are out of balance?
  18. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Thank you, I read a bit on the harmonic balancers and I still claim weak understanding but harmonic balance vibrations are felt as RPM increase and disappear in idle, can balancer still cause issues in idle?
  19. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Yes, depreciation hit due to COVID on these trucks is so huge that I am considering options to pay for more troubleshooting, in the past 8 months since purchase truck lost $12K value and it is only with 5K miles added. Bottle test got even worse now. Thing is that I cannot find a shop in North...
  20. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Yes, sadly gotten all the way to the Arbitration. General Motors of 2019-20 has their priorities wrong, instead of increasing Cost of Poor Quality budget to fight defects, they spend their money on lawyers and agents to fight with their customers. This is Mary Barra's strategy of customer care -...
  21. S

    Is there such thing as out of balance (engine, AC fan, etc.) that cause rough idle?

    Blackbear guys were very helpful in analyzing the logs with me for the rough idle. They are A-class experts on GM motors and all analytics points that my ever persisting rough idle condition on 2018 Yukon is likely not ignition or fuel related thus no codes and very good reading in the logs...
  22. S

    How smooth is smooth the warmed up idle on 2018+ trucks?

    Thank you, very interesting to sample. BlackBear guys told me that 5.3 are so smooth these days, one should look at the tach to see if it is running, that was BlackBear's take on smooth. Justin has taken a look at the logs of my truck and plotted them. He registers issues on the plots but unsure...
  23. S

    How smooth is smooth the warmed up idle on 2018+ trucks?

    Denali is 6.2L though? Correct?
  24. S

    Rough idle is back with vengence

    No offense at all. My truck is 2018 5.3 that is why I thought it was misplaced. I always appreciate all the help from all of you, folks.
  25. S

    How smooth is smooth the warmed up idle on 2018+ trucks?

    Some of you may know me already ;) I am still riding the 2018 Yukon with rough idle. I need a good truck that has 3 rows and can pull a decent size camper and get off the pavement. The good tug is hard to get these days. 2020 Tahoes are sold for very good price now since everyone wants T1s...

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