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Old 10-09-2021, 09:20 AM   #1
GenesisCoupe
 
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Question L99 Vibration in car

Good day. Does anybody have any vibration in car like a torque converter malfunction ? I visited GM service, they disabled turning off 4 cylinders and no vibrations at all. It very looks like torque converter issue. What engine parts may be needed for replacement ? Any suggestions
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Old 10-09-2021, 04:13 PM   #2
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I think there was a TSB for the torque converter clutch regulator valve on the Camaros and some of Chevys other models. I know the vibration was common on the V8 trucks too.

Chevys AFM sure was a piece of crap for owners.
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Old 10-09-2021, 05:12 PM   #3
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Good day. Does anybody have any vibration in car like a torque converter malfunction ? I visited GM service, they disabled turning off 4 cylinders and no vibrations at all. It very looks like torque converter issue. What engine parts may be needed for replacement ? Any suggestions
Time for a big cam and a stall converter
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Old 10-09-2021, 08:29 PM   #4
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If no vibes with AFM/DOD disabled….Have it turned off permanently with a tune.
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Old 10-10-2021, 02:55 AM   #5
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If no vibes with AFM/DOD disabled….Have it turned off permanently with a tune.
i have written popcorn firmware, i should return to the stock one, then will check again. maybe system does not recognize what is going on.

What AFM/DOD consists of ? 4 electronic hydro compensators ?
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Old 10-10-2021, 07:52 AM   #6
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Absolutely and It’s controlled by the ECM….save the popcorn for the movies and tune out the bad vibes
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Old 10-11-2021, 05:10 AM   #7
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Absolutely and It’s controlled by the ECM….save the popcorn for the movies and tune out the bad vibes
I returned back to stock firmware with no cat settings. The issue remains.

I went to the GM dealer. When AFM system is ON everything is OK. Vibrations and kicks happens while driving during changing from OFF to ON and conversely.

They said that the engine oil pressure on idle is 20 psi and this can be a reason. But GM dealer does not know what to do and how to solve this problem. Oil is 5W30, stock pump.

Any suggestions?
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Old 10-11-2021, 11:00 PM   #8
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Found OBDII device on Amazon, Range Technology Plug & Play AFM/DFM Active Fuel Management Disabler Compatible with GM Vehicles RA003B.

Does anybody used this one ?
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Old 10-12-2021, 05:07 PM   #9
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Found OBDII device on Amazon, Range Technology Plug & Play AFM/DFM Active Fuel Management Disabler Compatible with GM Vehicles RA003B.

Does anybody used this one ?
I have this in my 2015 and have not had any issues just dont leave it plugged in it will drain battery.
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Old 10-12-2021, 08:44 PM   #10
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I have this in my 2015 and have not had any issues just dont leave it plugged in it will drain battery.
Will it work with tuned ECU? I have O2 sensors disabled, settings were modified in the ECU...
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Old 10-13-2021, 05:38 PM   #11
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Will it work with tuned ECU? I have O2 sensors disabled, settings were modified in the ECU...
That I dont know but its cheap enough to try and see.
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Old 10-13-2021, 05:39 PM   #12
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Will it work with tuned ECU? I have O2 sensors disabled, settings were modified in the ECU...
Why not get it turned off in the tune then?
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Old 10-14-2021, 04:42 AM   #13
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Why not get it turned off in the tune then?
In my country nobody could do this ) Range device is my option
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