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Error Code 24 on a 87 IROC TPI T-5

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Old 03-06-2009, 08:19 AM
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Car: 1987 IROCZ
Engine: 5.0L TPI
Transmission: T-5
Axle/Gears: BW 3.45
Error Code 24 on a 87 IROC TPI T-5

As I began driving home yesterday I noticed my spedometer was not working and the check engine came on. I checked it and a error code 24 came up. I'm not sure where to start looking, from other threads it looks like it might be a vss problem? I'm not sure, please send me in the right direction!
Old 03-06-2009, 08:46 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Error Code 24 on a 87 IROC TPI T-5

Originally Posted by Pingu 2.0
As I began driving home yesterday I noticed my spedometer was not working and the check engine came on. I checked it and a error code 24 came up. I'm not sure where to start looking, from other threads it looks like it might be a vss problem? I'm not sure, please send me in the right direction!
Since your 87 is cable driven, I suggest that the fault lies with the cable or speedo head. If either of those is bad, the VSS can't function and will throw a code 24, IIRC.

JamesC
Old 03-06-2009, 09:04 AM
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Car: 1987 IROCZ
Engine: 5.0L TPI
Transmission: T-5
Axle/Gears: BW 3.45
Re: Error Code 24 on a 87 IROC TPI T-5

also, the trip has been dead for a while and odo was reading extremely high this past weekend, if that narrows it down any...
Old 03-06-2009, 09:17 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Error Code 24 on a 87 IROC TPI T-5

Originally Posted by Pingu 2.0
also, the trip has been dead for a while and odo was reading extremely high this past weekend, if that narrows it down any...
Here's a fix for the trip:

https://www.thirdgen.org/forums/faq-...-fix-pics.html

Sounds like the speedo head, but you'd be remiss not to also check the cable. At any rate, if the speedo isn't working, there are only three possibilities: drive/driven gears have broken, the cable itself has severed, or the speedo head is bad.

JamesC

Last edited by JamesC; 03-06-2009 at 09:24 AM.
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