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It would be a transmission issue, not up shifting. If the engine is in "limp mode" it will not accelerate over a set mph.

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Q: What causes a car to not go over 45 mph?
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Related questions

How much water causes hydroplaning?

A car traveling over 45 mph can hydroplane with about 1/10th of an inch of water on the road.


Can a car doing 45 mph with 12 inch wheels travel faster than a car doing 45 mph with 18 inch wheels?

45 mph is the same as 45 mph. How can one of the two be faster?


Two cars are traveling a distance of 10 miles One car travels at 35 mph and the other car travels at 45 mph How much sooner did the 45 MPH car arrive than the 35 MPH ca?

90seconds


Which travels faster a car doing 45 mph with size 12 wheels or a car doing 45 mph with size 18 wheels?

neither


If a car travels 90 mph in 1 in a half hours is its speed 45 mph?

No.


Loss of power over 50 mph?

2002 alero no power over 45 mph


Should you drive with or without overdrive?

If you are driving for a period of time over 45 mph then use overdrive. If you are driving under 45 mph or in traffic that is speeding up and slowing down over and under 45 mph then do not use.


How much water can cause hydroplaning?

A car traveling over 45 mph can hydroplane with about 1/10th of an inch of water on the road.


How long would it take a car to accelerate from 20 mph to 45 mph if its acceleration is 10 mphsec?

a = (vf - v0)/Δt 10 mph/s = (45 mph - 20 mph)/Δt Δt = 2.5 s


How many hours will a car traveling at 45 miles per hour take to catch up with a car traveling at 30 miles per hour if the slower car starts one hour before the faster car?

After 1 hour the slower car will be 30 mph x 1 hour = 30 miles ahead of the faster car. The faster car is travelling 45 mph - 30 mph = 15 mph faster than the slower car and so will cover this 30 miles in 30 miles ÷ 15 mph = 2 hours at which point it will have caught the slower car and start to over take it.


What type of energy a car is traveling 45 mph have?

Kinetic Energy


How far can a car go at 45 mph in 5 seconds?

45 mph = 45 miles in an hour = 0.75 miles in a minute = 0.0625 miles in 5 seconds = 0.1 km = 100m.