Speedometer Problem
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Speedometer Problem
I have a '91 Ranger with a 3.0L engine and an automatic OD tranny. My speedometer reading is about 5 - 7 miles above normal on a warm day.
The needle is not erratic or jumpy. However, when it gets cold, say below 40 degrees, the speedometer reads about 20- 25 mph above normal. I am thinking this is not a mechanical problem. I looked at what should be the speedo cable coming out of the transmission but there is an electric sensor above it. I assumed the speedo was driven by the cable. What does the sensor do? Could that be the problem?
The needle is not erratic or jumpy. However, when it gets cold, say below 40 degrees, the speedometer reads about 20- 25 mph above normal. I am thinking this is not a mechanical problem. I looked at what should be the speedo cable coming out of the transmission but there is an electric sensor above it. I assumed the speedo was driven by the cable. What does the sensor do? Could that be the problem?
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the reason for the 20-25 MPH on the speedo when it is cold out is due to insufficient lubrication of the speedometer head. ford put a bulletin out for the problem. the only fix for this is to replace it.
as for the 5-7 mph on a normal day, did you put different size tires on your truck?
as for the 5-7 mph on a normal day, did you put different size tires on your truck?
Last edited by el conquistador; Dec 15, 2004 at 03:20 PM.
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Thanks for the info.!...I have had 14" rims with the same size tires on the truck since I have had it, about 10 years. I sort of figured out there may have been a problem with the speedometer reading about a year ago when it occured to me that everybody was passing me up all the time. I didn't worry about the difference since it was consistent I could just drive 5 mph faster than the speed indicated... but when it jumps to 20 I am just bait for the police....I am not sure what tires are supposed to come with the Ranger..I asked around but never could get a straight answer...I had a friend that had a Ranger that had 16" tires...so I am not sure.
