engine surging problem
10-07-2011 | 03:19 PM
#31
Joined: 05-22-2008
Posts: 3
From: Houston, TX
https://www.chevyhhr.net/forums/show...ighlight=surge
Page five of thread . Transmission tap cells DO have adaptive strategy learning and they DO corrupt on these vehicles/transmissions.
Page five of thread . Transmission tap cells DO have adaptive strategy learning and they DO corrupt on these vehicles/transmissions.
10-08-2011 | 12:14 PM
#32
New Member
Joined: 01-14-2009
Posts: 10
From: NW Washington
TexTech, looks like you had this nailed down long time ago!
Are you a Service Tec?
My question to you is, when this happens again, did you try the battery disconnect, wait 20 min., then touch the battery cables together, (witch I did not have the nerve to do, micro circuits, micro voltage), did it reset again and fix the reacurring problem? Looking for a way around the dealer visit and charge for this defect.
HopHotRod, did you get the reset done, and did it work for you?
Are you a Service Tec?
My question to you is, when this happens again, did you try the battery disconnect, wait 20 min., then touch the battery cables together, (witch I did not have the nerve to do, micro circuits, micro voltage), did it reset again and fix the reacurring problem? Looking for a way around the dealer visit and charge for this defect.
HopHotRod, did you get the reset done, and did it work for you?
10-09-2011 | 02:43 AM
#33
Senior Member
Joined: 01-04-2008
Posts: 2,366
From: Long Beach, Ca
No I havent tried yet, will probably this week. With this and all the other noise issues, I just park it and drive my Marauder.
So.......
It is a software issue in the adaptive strategy of the PCM/TCM. Until they come up with a decent rewrite to address it, it can be cleared up in most cases by resetting the TAP(transmission adaptive pressure) Cells(parameters) to "zero"/base/centerpoint values(not really zero since they range from 4-16).
This cleared up the bounce from my '08 2.2 for about 20K miles but it is returning again. It can be done with a TechII diagnostic tool and with "some" generic ones. When we had ours done it made the converter lock sooner and stay locked with more app(throttle). It helped our rural/urban mixed commute mileage by almost 2 MPG and made the converter/transmission much more stable/pleasant. My wife and I are moderate to average drivers when it comes to driving style. Some report that if they "thrash" the throttle for a day or two that it builds higher pressure adaptive strategy and gets better for a while....doesn't help you MPG though!
Pulling the TCM fuse will not reset the adaptive parameters. It will NOT. With all the BS Ive gone thru with the dealer, Im sure I can get them to do this.
So.......
It is a software issue in the adaptive strategy of the PCM/TCM. Until they come up with a decent rewrite to address it, it can be cleared up in most cases by resetting the TAP(transmission adaptive pressure) Cells(parameters) to "zero"/base/centerpoint values(not really zero since they range from 4-16).
This cleared up the bounce from my '08 2.2 for about 20K miles but it is returning again. It can be done with a TechII diagnostic tool and with "some" generic ones. When we had ours done it made the converter lock sooner and stay locked with more app(throttle). It helped our rural/urban mixed commute mileage by almost 2 MPG and made the converter/transmission much more stable/pleasant. My wife and I are moderate to average drivers when it comes to driving style. Some report that if they "thrash" the throttle for a day or two that it builds higher pressure adaptive strategy and gets better for a while....doesn't help you MPG though!
Pulling the TCM fuse will not reset the adaptive parameters. It will NOT. With all the BS Ive gone thru with the dealer, Im sure I can get them to do this.
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