2006 gt self revving when cold? - Mustang Evolution

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Old 10-29-2013, 02:19 PM   #1
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Question 2006 gt self revving when cold?

I just bought my 2006 gt 5 speed about a week ago. I have noticed one thing when i start it up to go to work in the morning. If i just let it sit until it warms up it is totally normal and fine but it i try to drive it cold i notice that when ever i stop, the car revs it self up. it bounces the needle from about 750rpm to 2000 or even about 2500. I have been doing a little research and ive found that some cars have the computer set so the car will try to warm itself up but my gt is bouncing the needle about once every couple of seconds. it seems like it would be bad to rev an engine like that when its that cold in the morning. Also it is only revving itself when it is in neutral, clutch in or out. once i put it in gear or drop the clutch a little it seems to level out. Is this a problem or does it do that on purpose? Has anyone else noticed this? ive heard it might be something called surging, the engine trying to warm itself up? Also ive been told to clean my throttle body, how would i go about doing that? is there a spray? just unhook the intake? or do i need to take the whole thing off?

-Sean
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Old 10-29-2013, 03:09 PM   #2
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Quote:
Originally Posted by TyeDyE View Post
I just bought my 2006 gt 5 speed about a week ago. I have noticed one thing when i start it up to go to work in the morning. If i just let it sit until it warms up it is totally normal and fine but it i try to drive it cold i notice that when ever i stop, the car revs it self up. it bounces the needle from about 750rpm to 2000 or even about 2500. I have been doing a little research and ive found that some cars have the computer set so the car will try to warm itself up but my gt is bouncing the needle about once every couple of seconds. it seems like it would be bad to rev an engine like that when its that cold in the morning. Also it is only revving itself when it is in neutral, clutch in or out. once i put it in gear or drop the clutch a little it seems to level out. Is this a problem or does it do that on purpose? Has anyone else noticed this? ive heard it might be something called surging, the engine trying to warm itself up? Also ive been told to clean my throttle body, how would i go about doing that? is there a spray? just unhook the intake? or do i need to take the whole thing off?

-Sean
Is your GT totally stock? Any after-market parts like Throttle Body?
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Old 10-29-2013, 05:11 PM   #3
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How many miles are on the car?
It's not supposed to surge like that. The computer does make it idle a little higher than normal when the engine is cold but it is a steady RPM.
The idle air control valve is the device that controls the idle. It could be the problem but I believe that the throttle position sensor can cause a surging idle as well.
I'd have it scanned for any codes so that you're not "blindly" throwing parts at it.
Depending on the mileage of this car, it's always a good idea to make sure that everything is clean and tuned up.
And, Yes, you need to remove the throttle body to properly clean it.
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Old 11-04-2013, 06:18 PM   #4
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if u have open air box or dirty MAF could cause issues too
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