4L60E VSS erratic reading
Thread Starter
12 Second Club
Joined: Nov 2010
Posts: 83
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From: Brownstown, MI
4L60E VSS erratic reading Any thoughts would be appreciated.
Car is a swapped LQ4, 4L60E, only mods are CAI and Tune
Rebuilt 4L60E with the Beast, Corvette Servo, Raybestos clutches, Trans Go stage 2 shift kit, new shift solenoids.
Going through the lights at the 1/4 mile my VSS readings are erratic. 106 to 80 mph then back to 90 mph. car feels like it down shifted. It doesn't do this all the time about every 4th or 5th run.
I am attempting to upload the HPtuner log from that run.
Thank You in advance
Car is a swapped LQ4, 4L60E, only mods are CAI and Tune
Rebuilt 4L60E with the Beast, Corvette Servo, Raybestos clutches, Trans Go stage 2 shift kit, new shift solenoids.
Going through the lights at the 1/4 mile my VSS readings are erratic. 106 to 80 mph then back to 90 mph. car feels like it down shifted. It doesn't do this all the time about every 4th or 5th run.
I am attempting to upload the HPtuner log from that run.
Thank You in advance
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
Thank You for including a log!!!!! I can see the rapid VSS drop-off, And it was pretty erratic leading up to the drop-off.
Do you have a circuit piggy-backing on VSS High/VSS Low?
Is the VSS High & Low circuits/wires "twisted"/shielded?
Your log so everyone can view it.
Do you have a circuit piggy-backing on VSS High/VSS Low?
Is the VSS High & Low circuits/wires "twisted"/shielded?
Your log so everyone can view it.
Last edited by clinebarger; Jul 31, 2017 at 11:21 PM.
Thread Starter
12 Second Club
Joined: Nov 2010
Posts: 83
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From: Brownstown, MI
Thanks for the quick replies.
urb0123, I will pull the VSS and check it for metal tonight.
clinebarger, Yes the Speedhut Speedometer is tied into the VSS, the wires are not shielded as to my knowledge nor are they twisted, I will check both tonight. I will also upload my first pass from the other evening where the VSS reading was clean. Strange that it doesn't do it all the time and only at the higher speeds.
urb0123, I will pull the VSS and check it for metal tonight.
clinebarger, Yes the Speedhut Speedometer is tied into the VSS, the wires are not shielded as to my knowledge nor are they twisted, I will check both tonight. I will also upload my first pass from the other evening where the VSS reading was clean. Strange that it doesn't do it all the time and only at the higher speeds.
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
clinebarger, Yes the Speedhut Speedometer is tied into the VSS, the wires are not shielded as to my knowledge nor are they twisted, I will check both tonight. I will also upload my first pass from the other evening where the VSS reading was clean. Strange that it doesn't do it all the time and only at the higher speeds.
Thread Starter
12 Second Club
Joined: Nov 2010
Posts: 83
Likes: 0
From: Brownstown, MI
Cliebarger thanks for the info. I hooked the speedometer up to red connector pin 50 and re-calibrated my speedo. Can't get to the track till next week to check on it. I appreciate the help.
Urb0123 I did pull the VSS and there were no shavings on it. Thank you too.
Urb0123 I did pull the VSS and there were no shavings on it. Thank you too.
