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| TommyT-Bone | 90 C4 Reasons for not getting a mph reading | ||
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Chair-man of the bored
 
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MPH reads 0 at any speed. The 90 is obviously rebelling for not using it on a regular basis. Possible issues that may cause this? Another issue is it stalls out on deceleration. I put in some fresh fuel and have to run it a bit to see if it continues. It idles on start/restart and accelerates fine. Any thoughts are welcome.
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Posted on: 2014/11/8 18:52
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| TommyT-Bone | Re: 90 C4 Reasons for not getting a mph reading | ||
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Chair-man of the bored
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Speedo sensor on left side of the transmission is one possibility and one I'm leaning to. Worth a look. |
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Posted on: 2014/11/8 19:55
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| pianoguy | Re: 90 C4 Reasons for not getting a mph reading | ||
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Guru Emeritus
 
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Speedo mojo! There is nothing worse than a bad speedo:
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Posted on: 2014/11/8 23:16
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| Matatk | Re: 90 C4 Reasons for not getting a mph reading | ||
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Webmaster
 
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My first guess would be vehicle speed sensor that you mentioned. The car will throw a code for a bad VSS.
Stalling on decel could be the IAC or several other things. I would check for codes first. |
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Posted on: 2014/11/9 12:22
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: 90 C4 Reasons for not getting a mph reading | ||
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Grand Imperial Pooh-Bah
 
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I agree.
The VSS is my first guess, and it might be why it's stalling. The controller does not know vehicle speed... things get complicated by cause and effect in the ECM. |
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Posted on: 2014/11/9 17:36
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| PeteK | Re: 90 C4 Reasons for not getting a mph reading | ||
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Moderator
 
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Pluck the speedo sensor out, and shine a light into the speedo gears. I see more gear failures than sensor failures.
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Posted on: 2014/11/10 12:50
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| Matatk | Re: 90 C4 Reasons for not getting a mph reading | ||
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Quote:
If you have the VSS pulled out, use a cordless drill to drive it and see if you get a reading on your dashboard. |
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Posted on: 2014/11/10 13:28
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: 90 C4 Reasons for not getting a mph reading | ||
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Grand Imperial Pooh-Bah
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I like the gears solution a lot... they are only plastic.
Great to see you back, Pete! |
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Posted on: 2014/11/10 17:24
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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