Couple questions

[Sniper82]

Is it normal for a car to idle at 2k when first started and could warped rotors cause the car to shake sometimes while driving at 5-10mph speeds? I've noticed while braking the car kinda pulsates.

 

[RedArmy]

What year is the car? The only reason I'm asking this is because a high idle like that may be possible on a carbureted car, but on most fuel injected cars that would be considered kinda high. As for your second question, yes, it is likely that you would have warped rotors causing the pulsating of the car when you're braking from those speeds.

 

[Sniper82]

Originally posted by: RedArmy
What year is the car? The only reason I'm asking this is because a high idle like that may be possible on a carbureted car, but on most fuel injected cars that would be considered kinda high. As for your second question, yes, it is likely that you would have warped rotors causing the pulsating of the car when you're braking from those speeds.

its a 96 Geo Prizm with a 1.6. Could the rotors(if warped) cause the car shimmy and shake slightly at 5-10mph speeds?

 

[ashishmishra]

I have a 2003 Hyundai Elantra, if the temperature is very cold then it idles at 2000 rpm for 2-3 minutes before returning to the normal 800 rpm idle. It is nothing but a mechanism to heat the engine up, I believe during that time the ECU also advances the combustion timing to generate more heat for the engine quickly, till it warms up. A warm engine is vital for proper emission control, fuel economy and for the Engine oil to lubricate your engine properly. In other words it is normal if the rpms come down after a few minutes.

I haven't experienced warped rotors myself, but based on what I've heard its quite likely that the symptoms you're experiencing (only if they occur during braking) are due to warped rotors.

 

[thomsbrain]

2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

 

[Sniper82]

Originally posted by: thomsbrain
2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

It does it when my foot ain't on the brakes. What else could it be?

 

[CADsortaGUY]

Originally posted by: Sniper82

Originally posted by: thomsbrain
2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

It does it when my foot ain't on the brakes. What else could it be?

Bent rim.

 

[woodie1]

Originally posted by: CADsortaGUY

Originally posted by: Sniper82

Originally posted by: thomsbrain
2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

It does it when my foot ain't on the brakes. What else could it be?

Bent rim.

Yes, that or your tires are flat spotted from locking up the brakes at some time.

 

[Sniper82]

Originally posted by: woodie1

Originally posted by: CADsortaGUY

Originally posted by: Sniper82

Originally posted by: thomsbrain
2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

It does it when my foot ain't on the brakes. What else could it be?

Bent rim.

Yes, that or your tires are flat spotted from locking up the brakes at some time.

I put two brand new tires on the front but not the back so that likely ain't it. What would be the best/easiest way to check for a bent rim?

 

[CADsortaGUY]

Originally posted by: Sniper82

Originally posted by: woodie1

Originally posted by: CADsortaGUY

Originally posted by: Sniper82

Originally posted by: thomsbrain
2K is on the high side for cold idle, but it could very well be the specified idle. As long as the idle speed reduces as the car warms up, and it isn't revving all over the place, I wouldn't worry about it.

As for your brakes, I assume when you say 5-10 MPH, what you mean is that you are riding the brakes? If so, yes, you probably have warped rotors. If it does it without your foot on the brake, it is not likely to be the rotors, though.

It does it when my foot ain't on the brakes. What else could it be?

Bent rim.

Yes, that or your tires are flat spotted from locking up the brakes at some time.

I put two brand new tires on the front but not the back so that likely ain't it. What would be the best/easiest way to check for a bent rim?

Visual check for scuffs. It's not hard to bend a rim but usually whatever you hit that bent it will leave a mark. IF you can't find anything then having your wheels balanced would tell you. A good tire guy will tell you if your rim is bent(hard to balance correctly) and the same goes for the "flat spot" - they will be able to tell you.