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Discussion Starter #1
When I'm in drive but stopped, say at a red light, my engine and car vibrates pretty violently. If i switch it to neutral or park, it stops instantly. I'm thinking it may be the transmission mount but I don't want to buy a new one if that's not the problem. Has anyone had a similar issue with their pony??

I have an automatic transmission by the way.
 

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Mine will sometimes do that...seems more common in cold weather I've found


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Discussion Starter #5
Same happened to mine until i changed the spark plugs and my CAI filter


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Thanks for your input. I'll consider the spark plugs. How long do they usually last? My car is an 08, but just reached 45K miles yesterday.

And I installed a new CAI recently.
 

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Discussion Starter #7
So I removed the transmission mount and inspected it. Everything seemed fine. I rotated the insulator which sits on the crossmember, and replaced the crossmember. I also removed all of the sparkplugs, inspected, re-gapped, replaced one bad one, and reinstalled the rest.
I had replaced the fuel filter a couple of years ago.

In the end, the vibration remains. I doubt its the motor mounts because the vibration completely stops as soon as I accelerate, or when in neutral. I've also revved the engine while in drive with my foot on the brake. The engine torques to the right, but doesn't jump as i would with bad motor mounts.
 

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Discussion Starter #8
So I have noticed that the vibration only occurs when the AC is turned on. If I rev the engine as slight as possible, the vibration stops, but returns as soon as the RPMs return to "idle". Is the engine supposed to increase RPMs when the AC is turned on to compensate for the extra load? If so, could this be an electrical issue where the ECU is not recognizing that the AC is running, or not sending a signal to increase RPMs?

Alternatively, I can change the RPM idle limit with my tuner. I may give that a shot to see if it helps.
 

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2007 GT/CS

I have a very similar problem with my car, I have a 07 GT/CS automatic, my car will do the same thing rattle and vibrate while at a stop sign but as soon as I put it into neutral vibration goes away. I have changed the spark plugs, they needed them and I still have the vibration. Do you still have that issue?? If so what more have you do or checked??
 

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I have also read bad motor mounts will cause this. Happening on my 07 Focus. Thinking about replacing mine.


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Is it idling at significantly lower rpm than it used to? There is something in the electronics called an idle sensor, and some cars do indeed link it to the AC so that the engine does not lug at idle when the AC kicks on.
If it is only vibrating when the AC kicks on, then it could be anything from your idle circuits to the AC clutch.......
 

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It idles normal. But I remember when I used the AC it started shaking, too, and I rarely use my AC. But mostly vibration will occur when stopped and gear in drive or reverse.

Is it idling at significantly lower rpm than it used to? There is something in the electronics called an idle sensor, and some cars do indeed link it to the AC so that the engine does not lug at idle when the AC kicks on.
If it is only vibrating when the AC kicks on, then it could be anything from your idle circuits to the AC clutch.......
 

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So I removed the transmission mount and inspected it. Everything seemed fine. I rotated the insulator which sits on the crossmember, and replaced the crossmember. I also removed all of the sparkplugs, inspected, re-gapped, replaced one bad one, and reinstalled the rest.
I had replaced the fuel filter a couple of years ago.

In the end, the vibration remains. I doubt its the motor mounts because the vibration completely stops as soon as I accelerate, or when in neutral. I've also revved the engine while in drive with my foot on the brake. The engine torques to the right, but doesn't jump as i would with bad motor mounts.
I have this same problem but it still does vibrate a little bit when in neutral or park but vibrates the most when I'm in the drive through and this causes my exhaust to rattle
 

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So I have noticed that the vibration only occurs when the AC is turned on. If I rev the engine as slight as possible, the vibration stops, but returns as soon as the RPMs return to "idle". Is the engine supposed to increase RPMs when the AC is turned on to compensate for the extra load? If so, could this be an electrical issue where the ECU is not recognizing that the AC is running, or not sending a signal to increase RPMs?

Alternatively, I can change the RPM idle limit with my tuner. I may give that a shot to see if it helps.
Damn I think this be my problem too
 

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So I have noticed that the vibration only occurs when the AC is turned on. If I rev the engine as slight as possible, the vibration stops, but returns as soon as the RPMs return to "idle". Is the engine supposed to increase RPMs when the AC is turned on to compensate for the extra load? If so, could this be an electrical issue where the ECU is not recognizing that the AC is running, or not sending a signal to increase RPMs?

Alternatively, I can change the RPM idle limit with my tuner. I may give that a shot to see if it helps.
Its the iac look up badiac symptoms if you don't believe me but I have been having this problem but i have done alot of research and that's what I found
 
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