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| sliding | Intermittent speedo problem | ||
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Senior Guru
 
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I'm having some LCD speedo problems.
When I start to drive, I have 0 all the time. Then, as I drive, speedo strats to jump from 0 to actual speed and back to 0. As I continue to drive, I get more and more actual speed shown. Then finally, after driving for 15 minutes or so, speedo starts to work normally all the time. Any idea what could be wrong? |
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Posted on: 2009/7/16 17:24
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'90 L98 auto with a lot of mods |
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| josephf31 | Re: Intermittent speedo problem | ||
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Quote:
My guess would be either a bad cluster or ECM... |
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Posted on: 2009/7/16 17:31
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2002 Magnetic Red C5 6 spd LS1 convertible |
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| Matatk | Re: Intermittent speedo problem | ||
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Webmaster
 
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Andy knows a little more about these, but have you checked for a short or bad wire between the vehicle speed sensor (VSS) and the ECM?
Matthew |
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Posted on: 2009/7/16 23:26
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| 1Fast04Vert | Re: Intermittent speedo problem | ||
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Elite Guru
 
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I am going to guess (and it is only a guess) that the VSS is the problem. It is not properly picking up the signal and transmitting it to the CCM. Not a wiring problem, bad VSS. On the big semi trucks, especially the Volvos this was a common problem with the same symptoms, so I am guessing the same cause for your Vette.
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Posted on: 2009/7/16 23:31
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2004 Vert. 475hp. Built by Vengeance Racing |
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| CentralCoaster | Re: Intermittent speedo problem | ||
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Senior Guru
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I would check the VSS or the wiring too it. Could be partway burnt on the exhaust and not making a good connection.
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Posted on: 2009/7/17 1:59
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1985 Z51, ZF6 |
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| Flashman | Re: Intermittent speedo problem | ||
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Senior Guru
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Hi,
Before you start pulling things apart, check the filter plug behind the distributor. It happened to me on my 87. My mph & rpm were erratic on a trip. The plug was loose. I plugged it in tight and no more problems. Good Luck. Joe Flash |
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Posted on: 2009/7/17 4:39
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