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VSS readings in TP

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Old Mar 22, 2012 | 03:37 PM
  #1  
TPI-Formula350-'s Avatar
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From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
VSS readings in TP

I'm getting an intermittent issue with my VSS circuit. Its is jumping all over but only when the car is in park not in gear. It shows to be going 0-70mph in park in my datalogs as well as the speedo jumping in the cluster. I know the VSS isnt moving in park. I've replaced the VSS, VSS buffer, Cluster....Any ideas?
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Old Mar 22, 2012 | 11:55 PM
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EagleMark's Avatar
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Re: VSS readings in TP

Is it only VSS jumpy? No other sensor readings?

Could be a loose conection in wiring somewhere, between salt and potholes back there anything could be possable? You've already replaced the obvious.

HTH!
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Old Mar 23, 2012 | 11:44 PM
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Re: VSS readings in TP

EMI
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Old Mar 23, 2012 | 11:50 PM
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Re: VSS readings in TP

Ah yes, the twisted pair from VSS getting interference from something. Do they run anywhere near coil or spark plug wires?
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Old Mar 24, 2012 | 09:34 AM
  #5  
TPI-Formula350-'s Avatar
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From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
Re: VSS readings in TP

Originally Posted by EagleMark
Ah yes, the twisted pair from VSS getting interference from something. Do they run anywhere near coil or spark plug wires?
I did only start getting this problem after installing my MSD... Sometimes I don't have any issue for a few weeks...I've mostly noticed it in park, also I had a few spikes in the speedo reading at slow very slow cruise

Last edited by TPI-Formula350-; Mar 24, 2012 at 09:37 AM.
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