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1986 5.0tpi non start, no check engine light

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Old Nov 4, 2017 | 08:37 AM
  #1  
Andy Cordery's Avatar
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1986 5.0tpi non start, no check engine light

Driving my 1986 5.0tpi today and the speedo stopped working and cut out when stopped, restarted and now sometimes stalls when coming to a stop, any ideas? Code 24 (vehicle speed sensor) flashing on check light, Other instruments are ok, drives ok but idle can be a bit funny, tried starting again earlier but wouldn't fire, no engine check light, turn heater fan switch and it came back on...... Any ideas?
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Old Nov 4, 2017 | 03:30 PM
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red rock's Avatar
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: 1986 5.0tpi non start, no check engine light

If this is the correct sensor (gm# 25007308) for a 1986, it's behind the gauge cluster for the speedometer. http://www.rockauto.com/info/903/5S4638__ra_p.jpg At rockauto.com. I'm not totally sure what this sensor might affect, you may have other electrical problems also.

Last edited by red rock; Nov 4, 2017 at 03:36 PM.
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Old Nov 4, 2017 | 03:49 PM
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Andy Cordery's Avatar
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Re: 1986 5.0tpi non start, no check engine light


It has a buffer box under dash
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Old Nov 4, 2017 | 04:06 PM
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: 1986 5.0tpi non start, no check engine light

http://www.waasadata.com/pontiac/graphic/VSSbuffer.jpg you can link to #7 post. https://www.thirdgen.org/forums/engi...-v6-350-a.html
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Old Nov 4, 2017 | 04:44 PM
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Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: 1986 5.0tpi non start, no check engine light



Great photo. Thanks for sharing. Saved for future reference.
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Old Nov 4, 2017 | 05:28 PM
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red rock's Avatar
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: 1986 5.0tpi non start, no check engine light

That's one part I don't have much experience with.
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