Pulse Lock Up Converter

BillTiger · 01-24-2018, 05:59 PM

Hi eveyone. My SS that I love dearly is having a problem with the pulse lock up converter. After having the car Dino Tuned, it now feels like going over rail road tracks on and off whenever the converter tries to lock up. RPM goes up 3-400 rpm and back and forth. Took to dealer and they say it is the nature of the beast and normal? Any ideas out there? The tuner described the TC as a pulse type vs the regular lock up and the issue is all over the internet. Looks like it is. Has GM put out any service bulletins other than change the fluid. Apparently the transmission is a different computer modular to program and no one can get into it to set the converter to lock up differently but apparently it can be done? Hope someone has gotten a late service recall to replace some parts as mine is getting worse as I drive it.

SuperSound · 01-24-2018, 07:55 PM

Never heard the term, pulse lock up converter...but sounds like you have the known issue with TC shudder. Most people describe it like driving over rumble strips.

http://www.camaro6.com/forums/showthread.php?t=470624

JT58 · 01-25-2018, 06:12 AM

This is exactly what my car is doing- the RPM's go up and down as the converter tries to lock up. The RPM's go up and down 200 RPM constantly and when the trans is hot and it does it, it is the "shudder" problem. I had the transmission flush done- which a good dealer will do as the first step. Next step is replacement of the torque converter. I am carefully monitoring my car after the flush- it is way better but the RPM's still go up and down 50 RPM. I am not sure if it is normal- guys with the A8- how steady are your RPM's when in 8th gear going steady highway speeds- does your tach needle stay steady or does it move up and down- even a little bit?

lt4camaro · 01-25-2018, 11:31 AM

Read all the same A8 issues on the corvette forum . They have the same issues.

https://www.corvetteforum.com/forums...-tracking.html

JT58 · 01-25-2018, 01:25 PM

Still seeking an answer- anyone here with the A8- look at your tach- how steady are your RPM's when in 8th gear going same speed on the highway or back road- does your tach needle stay steady or does it move up and down- even a little bit?

lt4camaro · 01-25-2018, 01:35 PM

Quote:

Originally Posted by JT58

Still seeking an answer- anyone here with the A8- look at your tach- how steady are your RPM's when in 8th gear going same speed on the highway or back road- does your tach needle stay steady or does it move up and down- even a little bit?

Read thru the link I will post again. The A8 corvette guys go into great detail on what they see and its right on what you are seeing .

https://www.corvetteforum.com/forums...-tracking.html

01-24-2018, 05:59 PM	#1
BillTiger Drives: Black 2017 SS Join Date: Mar 2017 Location: Lodi CA Posts: 4	Pulse Lock Up Converter Hi eveyone. My SS that I love dearly is having a problem with the pulse lock up converter. After having the car Dino Tuned, it now feels like going over rail road tracks on and off whenever the converter tries to lock up. RPM goes up 3-400 rpm and back and forth. Took to dealer and they say it is the nature of the beast and normal? Any ideas out there? The tuner described the TC as a pulse type vs the regular lock up and the issue is all over the internet. Looks like it is. Has GM put out any service bulletins other than change the fluid. Apparently the transmission is a different computer modular to program and no one can get into it to set the converter to lock up differently but apparently it can be done? Hope someone has gotten a late service recall to replace some parts as mine is getting worse as I drive it. Last edited by BillTiger; 01-25-2018 at 12:44 PM. Reason: additional informaiton

01-24-2018, 07:55 PM	#2
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	Never heard the term, pulse lock up converter...but sounds like you have the known issue with TC shudder. Most people describe it like driving over rumble strips. http://www.camaro6.com/forums/showthread.php?t=470624 __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

01-25-2018, 06:12 AM	#3
JT58 Drives: Former 2016 Camaro 1LT Join Date: Jan 2017 Location: Naples, FL Posts: 760	This is exactly what my car is doing- the RPM's go up and down as the converter tries to lock up. The RPM's go up and down 200 RPM constantly and when the trans is hot and it does it, it is the "shudder" problem. I had the transmission flush done- which a good dealer will do as the first step. Next step is replacement of the torque converter. I am carefully monitoring my car after the flush- it is way better but the RPM's still go up and down 50 RPM. I am not sure if it is normal- guys with the A8- how steady are your RPM's when in 8th gear going steady highway speeds- does your tach needle stay steady or does it move up and down- even a little bit? __________________ 2006 C6 Corvette Manual, 2019 Silverado, 1997 Jeep Wrangler

01-25-2018, 01:25 PM	#5
JT58 Drives: Former 2016 Camaro 1LT Join Date: Jan 2017 Location: Naples, FL Posts: 760	Still seeking an answer- anyone here with the A8- look at your tach- how steady are your RPM's when in 8th gear going same speed on the highway or back road- does your tach needle stay steady or does it move up and down- even a little bit? __________________ 2006 C6 Corvette Manual, 2019 Silverado, 1997 Jeep Wrangler

01-25-2018, 11:31 AM	#4
lt4camaro Drives: 2021 LT1 10 speed auto Join Date: May 2013 Location: Connecticut Posts: 2,355	Read all the same A8 issues on the corvette forum . They have the same issues. https://www.corvetteforum.com/forums...-tracking.html

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