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6
votes
2answers
279 views

Do I have to change my speedometer setting if I get larger tires?

I bought a jeep with very small tires (not sure the exact size). I recently bought a new pair of tires that are probably 2 or 3 inches larger radius. Do I have to update my jeep so the speed is ...
5
votes
2answers
5k views

Intermittently fluctuating/non-functioning speedometer in Volvo 940. Possible causes?

I have a 1992 Volvo 940. A few months ago, the speedometer started malfunctioning intermittently. Sometimes it would read correctly, other times the needle would wobble around, and sometimes it would ...
3
votes
4answers
542 views

is it normal for my car to accelerate on downhill when no gas is applied.

I find myself having to apply the break pedal everytime I go down an inclination. It's not too steep but the car seems to gain speed faster and faster. In the other cars I have driven, this was not ...
3
votes
2answers
4k views

Does tire size and/or tread wear significantly affect speed and speedometer accuracy?

I've always heard that tread wear affects the speed of your vehicle; i.e. you technically are going faster with new tires than you are with old, worn tires, for a given indicated speed by the ...
3
votes
3answers
124 views

Automobile EDR / Black Box - What is it for?

My partner has just started driving, and her insurance company have fitted a "Black Box" to her car. My understanding of these devices is somewhat vague, as some sites suggest that they only collect ...
3
votes
1answer
118 views

wavering speedometer

The speedometer on my '94 Suzuki Sidekick wavers sometimes. This seem to happen only when I'm accelerating in about the 40-60 kph range. I think it may happen consistently under those circumstances; ...
1
vote
2answers
154 views

1966 t-bird speedo reads way too high

Just bought a 66 tbird and everything is pretty straight, I love the car, but the main impediment to me registering it is the spedomometer, which typically reads about 50-60 when I am going much ...
1
vote
1answer
249 views

How are digital speedometer readings typically calculated?

This seemed like the most suitable SE site, I do apologize if this shouldn't go here. How are digital speedometer readings (for things like average speed calculations, etc) typically calculated - ...
1
vote
1answer
68 views

'00 Mercury Sable speedometer and ??? issues

My Sable is having several issues and I can't tell if they are related. The car is driven less than average, three or four days per week. At some point, it lost coolant and I had to add about two ...
1
vote
2answers
67 views

Volvo 940 stalls and speedometer goes wacko

My 91 Volvo 940 has been dying lately and won't restart. If you jump it, it restarts, but then sputters and stalls within about a minute. Before it stalls, the speedometer bounces up to about 20 mph ...
0
votes
1answer
111 views

“Flight recorder” for automobiles? [closed]

As I sat in traffic court last week for a non-moving violation, many of the cases were clearly he said/she said issues.. particularly with stop sign violations. I can easily see how this specific ...
0
votes
1answer
73 views

During accelerating, tachometer needle increased, but speed needle does not increase until RPM hits over 2

I have a 2000 Honda Accord SE. I have noticed that when I stepped on gas pedal after coming to a complete stop, or just starting a drive, the tachometer needle would increase while the speedometer ...