speedo loss and SES light
Thread Starter
Junior Member
iTrader: (2)
Joined: Nov 2000
Posts: 99
Likes: 0
From: Virginia Beach, VA
Transmission: 700R4
Axle/Gears: 2.73
speedo loss and SES light
1992 Trans am 5.0 TPI
sometimes while driving my speedometer will slam right down to zero and the SES light will flash and the car seems to run rough
but it will come back to normal after a split second
sometimes it cycles like that a few times
anyone ever have this problem?
thanks
Joe
sometimes while driving my speedometer will slam right down to zero and the SES light will flash and the car seems to run rough
but it will come back to normal after a split second
sometimes it cycles like that a few times
anyone ever have this problem?
thanks
Joe
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Excellent Brakes 140 to 0 in Zero Seconds !
You might have an intermittent VSS signal.
You can monitor the VSS signal with an audio amplifier.
Connect the amp’s input to the gray wire pin 8 going to the dash at the dash connector on the right as you would a CD player.
Ground to ground, the signal wire to the inner wire of the audio amplifier wire.
The next time the speedometer fails if the signal stopped also, you will know that‘s the problem.
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Happy Racing!
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8 Wheels Corner Better Than 4, If You’re On The Outside You Have Fair Warning
.
You can monitor the VSS signal with an audio amplifier.
Connect the amp’s input to the gray wire pin 8 going to the dash at the dash connector on the right as you would a CD player.
Ground to ground, the signal wire to the inner wire of the audio amplifier wire.
The next time the speedometer fails if the signal stopped also, you will know that‘s the problem.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
8 Wheels Corner Better Than 4, If You’re On The Outside You Have Fair Warning
.
Supreme Member
Joined: Jan 2004
Posts: 2,322
Likes: 100
From: So. Ohio
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4
Re: speedo loss and SES light
Ran into this a while back, would not register and the trans wouldn't shift. Thought I was in big trouble $$$. But it turned out the speed sensor was sludged up and not getting signal pulses. This is a plug in deal in the transmission tailshaft. Just take it out and clean it up. Maybe not your problem - but let's hope so.
Thread Starter
Junior Member
iTrader: (2)
Joined: Nov 2000
Posts: 99
Likes: 0
From: Virginia Beach, VA
Transmission: 700R4
Axle/Gears: 2.73
Re: speedo loss and SES light
Ive already replaced the VSS to see if that was the problem going to see if it does it again
but i figured a bad VSS wouldnt throw a code and make the car run rough
ive also replaced the ECM and TPS
but i figured a bad VSS wouldnt throw a code and make the car run rough
ive also replaced the ECM and TPS
Supreme Member
Joined: Jan 2004
Posts: 2,322
Likes: 100
From: So. Ohio
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4
Re: speedo loss and SES light
Something else to check. Behind the engine there are several grounding connections. Real hard to get to. These do get corroded, charred, and will loosen up and cause all sorts of problems like this. Check Them. I took all these connections and rerouted them to the top of the engine on the intake so I could keep an eye on them.
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