4L60 VSS Code 72 cause surging?
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
4L60 VSS Code 72 cause surging?
I know its not a 4L60E, but it is a square wave vice sine wave sensor in my 93 Corvette. I have a code 72, and a fresh rebuild on transmission.. Transmission runs great and pulls through 4th gear behind my 396LT1.
But at part throttle/cruise I get a slight surge. Engine is new, sensors are all new within engine, tuned by good reputable company, never any problems. But now I have this code, can it cause a surge with a 4L60?
But at part throttle/cruise I get a slight surge. Engine is new, sensors are all new within engine, tuned by good reputable company, never any problems. But now I have this code, can it cause a surge with a 4L60?
Team Owner
Joined: Sep 2003
Posts: 25,375
Likes: 2,734
I know its not a 4L60E, but it is a square wave vice sine wave sensor in my 93 Corvette. I have a code 72, and a fresh rebuild on transmission.. Transmission runs great and pulls through 4th gear behind my 396LT1.
But at part throttle/cruise I get a slight surge. Engine is new, sensors are all new within engine, tuned by good reputable company, never any problems. But now I have this code, can it cause a surge with a 4L60?
But at part throttle/cruise I get a slight surge. Engine is new, sensors are all new within engine, tuned by good reputable company, never any problems. But now I have this code, can it cause a surge with a 4L60?
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Interesting. SO the VSS sensor is not the problem? I need to read my FSM.
Team Owner
Joined: Sep 2003
Posts: 25,375
Likes: 2,734
There's driveability procedures for the code even in the '92 FSM I'm quite sure. It wouldn't be in earlier than '92 or later than '93. In '94 with the E transmission the code changed.
Last edited by WVZR-1; Jun 25, 2015 at 06:38 AM.
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Perhaps a "twisted tweak" in the tune? Is the company close that did the tune? I would think maybe just a Tech1 or appropriate scanner could maybe help here and since the transmission is fresh maybe the first thing to check.
There's driveability procedures for the code even in the '92 FSM I'm quite sure. It wouldn't be in earlier than '92 or later than '93. In '94 with the E transmission the code changed.
There's driveability procedures for the code even in the '92 FSM I'm quite sure. It wouldn't be in earlier than '92 or later than '93. In '94 with the E transmission the code changed.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Another symptom is the other day I tried to start it and nothing. I always have Vette on battery gender and voltage was 13.1 with my meter.. if gear selector switch is bad, can it cause this symptom too?
Safety Car
Joined: Jun 2003
Posts: 4,250
Likes: 656
From: San Diego Ca
Could the "surging" being the locking/unlocking of the TC? Or does it happen at a different speed.
Your Datamaster will tell us a lot. My 93 is set to lock at 48 mph and unlock at 44 mph. Likely not stock as I have tuned it extensively. But if that is the speed range of your surging it might tell us something.
Do you have the ECM file? It is a TunerCat or LT1Edit file?
Note: I just pulled out my Datamaster disc; V 3.x.x from 2000 and Windows 98 Wow! They (Does Steve still own Datamaster?) do have V4 out that will load on a Win 7 x64 computer or even Win 8.1.
Your Datamaster will tell us a lot. My 93 is set to lock at 48 mph and unlock at 44 mph. Likely not stock as I have tuned it extensively. But if that is the speed range of your surging it might tell us something.
Do you have the ECM file? It is a TunerCat or LT1Edit file?
Note: I just pulled out my Datamaster disc; V 3.x.x from 2000 and Windows 98 Wow! They (Does Steve still own Datamaster?) do have V4 out that will load on a Win 7 x64 computer or even Win 8.1.
Last edited by pkincy; Jun 26, 2015 at 12:51 AM.
Thread Starter
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Could the "surging" being the locking/unlocking of the TC? Or does it happen at a different speed.
Your Datamaster will tell us a lot. My 93 is set to lock at 48 mph and unlock at 44 mph. Likely not stock as I have tuned it extensively. But if that is the speed range of your surging it might tell us something.
Do you have the ECM file? It is a TunerCat or LT1Edit file?
Note: I just pulled out my Datamaster disc; V 3.x.x from 2000 and Windows 98 Wow! They (Does Steve still own Datamaster?) do have V4 out that will load on a Win 7 x64 computer or even Win 8.1.
Your Datamaster will tell us a lot. My 93 is set to lock at 48 mph and unlock at 44 mph. Likely not stock as I have tuned it extensively. But if that is the speed range of your surging it might tell us something.
Do you have the ECM file? It is a TunerCat or LT1Edit file?
Note: I just pulled out my Datamaster disc; V 3.x.x from 2000 and Windows 98 Wow! They (Does Steve still own Datamaster?) do have V4 out that will load on a Win 7 x64 computer or even Win 8.1.
i need to look into this.
I have tunercat DA2 version AX. Datamaster version 4.01 and using Windows7 64.