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93 Geo Prizm (Toyota Corolla) acting speedometer

Hi,

I have read some postings but I'm not sure what the problem is since I haven't seen anybody with this particular behaviour.

After some radiator/timing belt job, the car's speedometer started acting weird. It shows 0 MPH until I reach 40 - 50 MPH. When I reach

40-50 MPH, it goes to 65 MPH instantly (even though I'm not that fast) When I slow down, needle goes down dead to 0 MPH again. It is automatic transmission but there is NO shifting problem at all.

I mentioned to the mechanic who did the timing belt job, and he said it must be the sensor since these models don't use a wired system.

Any opinions?

Thanks.

Reply to
denoxis
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If it's a mechanical speedometer, check to see if it's catching. We had an old speedometer in our Corvair do almost exactly the same thing.

Charles of Kankakee

Reply to
n5hsr

I am having this exact same problem (either 0 or 65 showing on speedometer) on my 93 prizm. how do i check to see if it is catching? i would love some help with this!

thanks, Chris

Charles @ Kankakee wrote:

Reply to
sharefreemusic

I had a 92 Tercel that done this. It gets much worse in colder weather. Mine would emit a horrendous buzzing noise at the critical point of 45mph. I could hardly hear the radio. Apparently there is a set of gears or teeth somewhere on the cable behind the instrument cluster that requires lubrication, otherwise it will "catch" at about 45mph for some reason. The shop I took the tercel to told me this and they lubricated the problem but this was only a temporary fix. They had to take the instrument cluster out to get to it I beleive, I'm not sure. The more permanent fix of course would be to replace the part(s). Sorry I don't know that much about it, I'm only going by what the guy told me.

Reply to
CNB

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