Post by: zieg85 on July 11, 2016, 02:41:48 PM
Post by: LTZ C20 on July 11, 2016, 03:13:58 PM
Post by: zieg85 on July 11, 2016, 03:51:43 PM
Post by: bd on July 11, 2016, 06:11:35 PM
Post by: zieg85 on July 11, 2016, 06:15:18 PM
Check the brake switch function and adjustment either directly or using your scan tool.
if it was that wouldn't it kick off the cruise?
Post by: bd on July 11, 2016, 06:54:34 PM
Post by: zieg85 on July 11, 2016, 07:01:45 PM
Generally speaking, whether the TCC can be affected independently of cruise and brake lights depends on how the circuits are configured. On our squares, a brake switch slightly out of adjustment can cause the TCC to cycle erratically w/o affecting cruise or brake lights. The most common scenario is a switch bumped ever so slightly out of adjustment by inadvertently catching your toe under the brake pedal and lifting slightly.
I'll give it a try Friday when I get back up to where the car is.
Post by: Stewart G Griffin on July 11, 2016, 09:54:46 PM
Sorry can't get into more detail right now----getting sleepy.
Post by: Irish_Alley on July 13, 2016, 09:09:06 AM
Post by: zieg85 on July 13, 2016, 09:16:54 AM
those gm trans are controled by the ecm. your tps, brake switch, coolant temp, speed, MAF and gear dictate if the ecm will lock up the T/C. inside of the trans you have the valve body, faulty TCC,Bad o-rings, excess wear in TCC and a torque convertor soliniod that can cause the issue. sometimes cleaning the maf and resetting the computer via battery disconect can fix the problem or temperarly fix it. if memory serves me right its the 4t65 trans, the same trans we have in the impalas. some people never had one problem with them, others they turn into a nighmare.
Mine has always done it and wasn't noticeable until lately. Now it shudders a little when locking back it which tells me something is starting to get weak. 125K miles on it, have to expect things starting to go wrong with a 10+ year old car
Post by: zieg85 on July 13, 2016, 09:19:13 AM
Do you have access to a scan tool? One that can do live data streaming, if so, drive it while watching the torque converter clutch on/off data and confirm if that's actually what it is doing.
Read the manual a couple of times and this one doesn't seem to be fancy enough for the live data streaming. It doesn't do ABS or Airbag sensors either... :-(
Post by: Irish_Alley on July 13, 2016, 09:29:31 AM
Post by: LTZ C20 on July 13, 2016, 09:30:58 AM
Post by: Irish_Alley on July 13, 2016, 09:41:35 AM
Post by: zieg85 on July 13, 2016, 09:44:42 AM
and dont let them talk you into a flush. its a waist of money and GM put out a TSB about not doing a flush and the only thing they say to flush is the transmission cooler when youre replacing the whole trans cause the old one crapped out
Good to know, thanks for the heads up
Post by: Irish_Alley on July 13, 2016, 09:54:05 AM
this will also help you out on your travels
Post by: VileZambonie on July 13, 2016, 01:55:52 PM
Post by: Irish_Alley on July 13, 2016, 02:44:30 PM
http://ricksfreeautorepairadvice.com/transmission-flush/
http://www.m5ms.com/resources/GM-Bulletin-04-06-01-029G.pdf
Post by: zieg85 on July 13, 2016, 03:19:36 PM
Did you check the brake switch as BD recommended? Inspect the fluid and condition and service the trans. Flushes are okay if done correctly with a quality product like BG. A cleaning agent is added and then 16 qts is flushed through the system. A modifier and conditioner is added and it can help with tcc apply, sticking valves and solenoids. Flushing is bad if a) the unit is already toast and or b) if done incorrectly.
Will check brake switch ASAP. The car is with my wife 300 miles from me until Saturday. I asked her to try that the next time she can set the cruise and see if it still happens. She just had it emission tested about 1/2 hour ago. I will report my findings
Post by: hatzie on August 25, 2016, 06:53:47 PM
Did you check the brake switch as BD recommended? Inspect the fluid and condition and service the trans. Flushes are okay if done correctly with a quality product like BG. A cleaning agent is added and then 16 qts is flushed through the system. A modifier and conditioner is added and it can help with tcc apply, sticking valves and solenoids. Flushing is bad if a) the unit is already toast and or b) if done incorrectly.
DO NOT flush the 4T65E with anything other than Dexron VI. These are not TurboHydramatic or 4L60 4L80 slushboxes and they will get real snotty about anything other than Dexron VI tranny fluid and one or two tested and trusted additives. Ask Dave at TEP what Lucas additive formula he recommends... I believe it's Lucas Transmission Fix.
Thread on Dexron VI and why we do not flush the 4T65E from the LS4 boards... http://www.gmls4.com/index.php?topic=604.0
Iron poisoned PCS and TCC solenoids can cause what you describe. You have to drop the LH side of the cradle to get to em because they are under the LH side cover. There's a YouTube series where a guy does em on a GEN VII Impala. I posted them in this thread on the impalaforums. http://www.impalaforums.com/8th-gen-drivetrain/1129345-tranny-no-reverse-or-drive-2x-2.html
A shift kit along with the magnet upgrade per TSB 08-07-30-040 may help. Scroll down to my post in this Impala forums thread for the TSB http://www.impalaforums.com/chevy-impala-8th-gen-discussion/484562-2010-impala-lt-weird-transmission-shifts.html#post1212329
More on the 4T65E on ls1tech
http://ls1tech.com/forums/ls4-performance/1362861-4t65e-hd-delayed-engagement-fix.html
Dexron VI (with Lucas Transmission Fix only if you need it), a deeper pan with lowered strainer so she doesn't starve under heavy acceleration, a real Magnefine filter in the cooler return line, and the updated magnets are the recipie for 4T65E longevity. Maybe a 9C1 or TEP transmission cooler.
The only rebuilder worth bothering with on the 4T65E is Dave at TEP you will not be sorry you used him. GM rebuilds are usually only good for around 25-30k if that.
Obviously get a new converter, flush the cooler and lines thoroughly, and blow em completely dry before hooking them to your pristine new slushbox.
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Post by: zieg85 on August 25, 2016, 07:00:45 PM
Post by: hatzie on August 25, 2016, 07:39:34 PM
thank youNo problem.
You shoulda gotten the Lucerne Super with the baby NorthStar.
They came with 4T80 transmissions that GM should've used in the W body Lacrosse, GXP Grand Prix, and Impala SS with the LS4 5.3.Sent from my SM-P605V using Tapatalk
Post by: zieg85 on August 25, 2016, 07:46:59 PM
thank youNo problem.
You shoulda gotten the Lucerne Super with the baby NorthStar.
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It was the one my wife wanted, NorthStar's was far and few between plus I was warned against getting one
Post by: hatzie on August 25, 2016, 07:58:20 PM
Just kidding about the Northstar. Both the big and little Buick Supers are pretty rare. The LS4 Pontiac GXP and Impala SS are easier to find. I know a guy that collected all four... shaking my head.thank youNo problem.
You shoulda gotten the Lucerne Super with the baby NorthStar.
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It was the one my wife wanted, NorthStar's was far and few between plus I was warned against getting one
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Post by: zieg85 on April 09, 2018, 03:39:04 PM
Post by: zieg85 on April 10, 2018, 12:31:58 PM