My speedometer was sticky when I got the car about a month ago, I've driven it about 1500 miles, and now the speedo sits below 0 when stopped and twitches. If you put and electrical load on the system, it will fluctuate more. It is also inacurate at any speed. any ideas, or experiences would be helpful,
Thanks
Tadd
Sometime an erratic speedo is tell tale of charging problems. Had any other signs of inadequate charging?
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88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS. Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges.140 mph Motorsports Speedo New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and Kirban adj FPR, T-3. Centerforce II, KB subs and jack rails.
I don't notice any, and I never get a gen light or anything (if there is one). My other gauges have problems (fuel and oil pressure, not sure if the amp gauge works either.)
Tadd
You may have 2 seperate problems but cure may be fairly simple. first suggestion would be to remove the instrument cluster and inspect the wiring connectors to see if they are fully seated and locked in. If your fuel and oil guages are acting erratic you probably have an IVR (instument voltage regulator) concern which is very common. From Ford IVR part # is D1AZ-10804-A list $34.13. From a local parts store the "Standard" brand part # is VRC-606 list $36.80. Though I have never seen it this could be the route cause of your speedo problem also. Your speedo is electronic and the IVR conrols the voltage for the entire cluster. If you still have a speedo problem after the IVR, next likely source would be the vehicle speed sensor mounted on the left rear side of the trans. If the VSS wiring is clean, dry and tight remove the sensor, inspect the drive gear for wear if looks ok sensor probably NG hope this helps Rick B.
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Quote:Originally posted by fordtech58:
...Your speedo is electronic and the IVR conrols the voltage for the entire cluster.
Having spent a lot of time correcting mistakes resulting from my (so-far unsucessful) solid state IVR experiments, I'm pretty sure that the IVR does NOT supply voltage for the speedometer. The IVR supplies voltage for the fuel, oil, and temp gauges, and the fuel relay for the system sentry. The amp gauge is also a separate circuit, at least on the 1986.
So, if it is not a bad connection at the back of the instrument panel, an overall car-wide electrical problem, or a short in the flexible circuit board, I agree that it is probably two separate problems.
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1986 5-speed TurboCoupe with more problems than an Algebra textbook.