TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK.
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TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/20/2005 10:45:09 PM
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blazerrick
Posts: 8
Joined: 12/20/2005
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WHEN DRIVING AT ABOUT 50 MPH TORQUE CONVERTER LOCK UP ENGAGES AND DISENGAGES EVERY TIME UNDER LIGHT ACCELERATION GIVING ME A FLUXUATION OF 150 RPM'S OR SO AND KEEPS DOING IT AS LONG AS I'M AT THIS SPEED. STOPS DOING IT WHEN I REACH 65 MPH AND UP. HAD A CHECK ENGINE LIGHT RECENTLY. WHEN I PULLED THE CODE IT WAS JUST A P0128 WHICH WAS "COOLANT TEMP. LOWER THAN THERMOSTAT TEMP." I DON'T THINK THAT WOULD CAUSE MY TCC PROBLEM. I CLEARED THAT CODE AND HAS NOT COME BACK NOW FOR ABOUT 100 MILES. BUT WHATS UP WITH MY TRANNY? SOUNDS LIKE TSB #990730016A . COULD NOT FIND THE TSB SUMMARY.
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 12:01:13 AM
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LittleDan911
Posts: 147
Joined: 10/3/2005
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My Engine Light Pulled at Same Code p0128 But I Haven't Noticed Any Tranny Probs Yet I Replaced The Coolant Temp Sensor On The Intake (Left Side Sitting In Driver Seat And It Has Stayed Off Since.... So Your Getting Crapy MPG I'm Guessing Cause Mine Did When That Code Poped Up Cause That Sensor Is Saying That The Engine Is Still Cold And Throws More Fuel At It Tryin To Warm It Up But Your Temp Gauge Will Work Fine..Well THat Was My Prob I'll Have To C If My Trans Is Forked Up
< Message edited by LittleDan911 -- 12/21/2005 12:03:49 AM >
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 4:03:29 AM
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blazerrick
Posts: 8
Joined: 12/20/2005
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I WAS GOING TO REPLACE THE COOLANT TEMP. SENSOR IF MY LIGHT WERE TO COME BACK ON. MY TEMP USUALLY READS ABOUT 170 TO 180 F. HOWEVER I WAS GETTING PRETTY BAD GAS MILEAGE. MY NEXT OPTION WAS TO CHANGE THE THERMOSTAT AND FLUSH THE COOLING SYSTEM. I DROPPED THE TRUCK OFF TODAY AT A REAPIR SHOP TO SEE WHAT THEY TELL ME ABOUT THE TCC PROBLEM IF THEY FIX IT I'LL POST IT AND IF THEY DON'T I'LL STILL POST UP. TO LET YOU KNOW. HEY DAN NICE TRUCK DARK GREY IS HARD TO FIND.
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 6:30:20 AM
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swartlkk
Posts: 15276
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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As stated in your other thread: TRANSMISSION TROUBLE (TCC)
The ECT does have an influence on the TCC. It controls the lockup of the TCC while the engine is warming up. Before the ECT reads 160*F, the TCC is constantly slipping to provide more RPMs which results in higher heat buildup (faster warmup time).
That said, the New Member Area is not the proper section to have tech questions. It is for New Member introductions only. And please refrain from typing all in CAPs. It is bad forum ediquette and it does not draw more attention to your posts, if anything, it probably draws even less attention because it makes you look like you are impatient and shouting at everyone.
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Kyle-
04 Rainier
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 2:28:12 PM
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blazerrick
Posts: 8
Joined: 12/20/2005
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I'm just a new guy sorry about the shouting I didn't mean to yell. Alright I figured it out I think, since I don't have my loggin set as a cookie it somewhat logs me out after a while and what happened was when I saw the failed or not authorized message appear on the screen it meant that I wasn't allowed to post a thread yet seeming that I had just signed up to this forum yesterday. I made a mistake sorry about that and, the caps. I won't let it happen again, Bad me!!!
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RE: Hey Blazerick - 12/21/2005 3:27:04 PM
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m00nwater
Posts: 3269
Joined: 3/10/2005
From: Redbridge, but I now live in the 'shwa
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Ooops...I missed that one in the daily read-throughs.
I've moved it to the proper section here in Gen. Tech.
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RE: Hey Blazerick - 12/21/2005 4:46:56 PM
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m00nwater
Posts: 3269
Joined: 3/10/2005
From: Redbridge, but I now live in the 'shwa
Status: offline
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I'll forgive you this time 
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 7:50:07 PM
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93LT
Posts: 111
Joined: 10/19/2005
Status: offline
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quote:
ORIGINAL: blazerrick
WHEN DRIVING AT ABOUT 50 MPH TORQUE CONVERTER LOCK UP ENGAGES AND DISENGAGES EVERY TIME UNDER LIGHT ACCELERATION GIVING ME A FLUXUATION OF 150 RPM'S OR SO AND KEEPS DOING IT AS LONG AS I'M AT THIS SPEED. STOPS DOING IT WHEN I REACH 65 MPH AND UP. HAD A CHECK ENGINE LIGHT RECENTLY. WHEN I PULLED THE CODE IT WAS JUST A P0128 WHICH WAS "COOLANT TEMP. LOWER THAN THERMOSTAT TEMP." I DON'T THINK THAT WOULD CAUSE MY TCC PROBLEM. I CLEARED THAT CODE AND HAS NOT COME BACK NOW FOR ABOUT 100 MILES. BUT WHATS UP WITH MY TRANNY? SOUNDS LIKE TSB #990730016A . COULD NOT FIND THE TSB SUMMARY.
What year is your Blazer? 92-95 uses vacuum for TCC control, if you have to much of a vacuum leak, your torque converter will display the simptoms you describe. I had the same thing happen on my 93 model. Check your vacuum connections starting with the short 1/4" vacuum hose off the right rear corner of the upper intake plenum. This traces to a 4 way split, one hose running down to the tranny, very hard to trace, another going to your vacuum dash controls, another to cruise control, and the last going to the vacuum canister. A leak in any of these will cause your torque converter to freak out as if someone is tapping the brakes fast and random.
You have two temp sending units. One for the gauge (pre 1996 models, located in the right head), the other for the ECM (pre 1996 models, located in the right front of the lower intake plenum (right being the passenger side of the vehicle). The one in the head for the temp gauge has no bearing on anything but the gauge.
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1978 GMC Sierra Heavy Half
1993 Blazer LT 4Dr 4WD Vortec
1997 Olds Bravada AWD
2001 Silverado LT 2500HD CC 4WD
2001 Yukon SLT 4WD
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 7:57:37 PM
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swartlkk
Posts: 15276
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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This is a simple reason why 2 threads on the same subject should not happen.
He has an '02 4x4 LS. Everything you stated, 93LT, still applies except the vacuum and possibly the placement of the temp sensors (but I'm not sure if they changed or not). The ECT is the sensor that feeds the PCM with the engine temp.
*EDIT* - I just went outside and checked on the driver's side head sensor and seeing as how it's a single wire sensor, it is not the PCM sensor. I'll have to do some more digging to find out where the ECT is located.
< Message edited by swartlkk -- 12/21/2005 8:05:36 PM >
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/21/2005 9:10:51 PM
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93LT
Posts: 111
Joined: 10/19/2005
Status: offline
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quote:
ORIGINAL: swartlkk
This is a simple reason why 2 threads on the same subject should not happen.
He has an '02 4x4 LS. Everything you stated, 93LT, still applies except the vacuum and possibly the placement of the temp sensors (but I'm not sure if they changed or not). The ECT is the sensor that feeds the PCM with the engine temp.
*EDIT* - I just went outside and checked on the driver's side head sensor and seeing as how it's a single wire sensor, it is not the PCM sensor. I'll have to do some more digging to find out where the ECT is located.
Yeah, when I went to the other thread after replying to this one I found out it was a 2002 model. The drivers side head on my 93 and 95 both house the knock sensor, along with another located in the passenger head, at the back towards the firewall. Both of mine have the ECT sensor located in the passenger front lower intake manifold. I had to remove the belt to gain access with a socket and extension, barely visible with the air intake in place.
_____________________________
Rod
1978 GMC Sierra Heavy Half
1993 Blazer LT 4Dr 4WD Vortec
1997 Olds Bravada AWD
2001 Silverado LT 2500HD CC 4WD
2001 Yukon SLT 4WD
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/24/2005 11:01:04 PM
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blazerrick
Posts: 8
Joined: 12/20/2005
Status: offline
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OK bad news I think. I went ahead and replaced the t-stat and the ECT sensor and I still have the TCC issue @ 45 with very little load on the accelerator it still wonders in and out of lock up. This is a 2002 4x4 Vortec Blazer. Any other clues besides the TCC solenoid. Man I really hope it's not the solenoid, thats a nightmare. What else would control that converter lock?
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/28/2005 2:16:55 PM
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Hanr3
Wheels & Tire Moderator
Posts: 3523
Joined: 5/11/2005
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The TCC is controlled by the puter, which gets its info from the TPS, VSS, Brake switch, and a few others, like the temp sensor. Since you mention no other troubles, maybe you did somehwere else and I didn't see them. Anyways, start with the brake switch. make sure it is adjusted properly. The brake switch will kick it out of lock-up.
Do you drive with one foot on the brake and the other on the gas? If so, STOP DOING THAT!!!! It drives the people behind you nuts when your constantly braking all the time. Plus it kicks your TCC off everytime.....
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RE: TRANSMISSION GOES IN AND OUT OF TORQUE CONVERTER LOCK. - 12/28/2005 7:07:32 PM
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blazerrick
Posts: 8
Joined: 12/20/2005
Status: offline
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Ok you guys are probably going to hate this entry, but, my wife got tired of the whole trying to figure out the TCC problem. She traded the Blazer in for a brand new Ford Fusion V6 loaded and loves it. Sorry. You all were very helpful with helping me try and figure out this situation. Merry Christmas to all and have a Happy New Year!!
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