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Old 10-06-2012, 02:02 PM   #21
suss6052
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Quote:
Originally Posted by paul21 View Post
If your car feels mostly smooth then random harder jerks at idle, you should reset the car computer by disconnecting the battery for ~30 minutes or something and letting the engine idle for 5 minutes when you start it back up.

If your idle is smooth but causes a lot of vibration in general, then it's the motor mounts.

12B37 increases idle RPM from 700 to 800.
My car was built after the date range for the 12b37 update, but still idles at approximately 680 rpm with the a/c off and in park with my foot off the brake, or 750 rpm foot on the brake in gear with or without the a/c on approximately. At no point is the idle over 800 rpm per the digital tachometer displayed in test mode. Once you take your foot off the brake the rpms increase as the car begins to engage the clutch for 1st gear.
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Old 10-08-2012, 11:20 AM   #22
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Quote:
Originally Posted by Michaelc1220 View Post
...When im sitting at a light with my foot on the break, occasionally there is a noticeable vibration. You can feel this from both the drivers and passenger side...
Hi Michaelc1220,

I would recommend that you make an appointment at your dealership. Ford certified techs are in the best position to diagnose and repair your vehicle, in addition to giving you some peace of mind.

I'm happy to escalate your case to your region's Customer Service Manager; just send me a PM with your VIN, dealer, mileage, and daytime contact number. I'll get things rolling!

Quote:
Originally Posted by blank102 View Post
I think it has to do with the direct injection.
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Originally Posted by Rememo View Post
I've seen some posts fly by about bad motor mounts. That could cause vibes at idle.
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Originally Posted by SportyChick View Post
This was one of the first things I noticed when I picked up my "new" used Focus a couple of weeks ago (I never noticed it on the test drive though). I would be sitting at the lights with my foot on the brake and the car would be vibrating during idle.

I took my car in to a Ford dealership this past Wednesday and told them about it and they fixed it. The previous owner of the car would have received (so I'm told) notification for 2 recalls, one being the sync and the second being reprogramming the PCM, TCM and ABS module. This second recall is what fixed the shaking car during idle and it in fact did fix mine, recall 12B37B for your reference...
Quote:
Originally Posted by paul21 View Post
If your car feels mostly smooth then random harder jerks at idle, you should reset the car computer by disconnecting the battery for ~30 minutes or something and letting the engine idle for 5 minutes when you start it back up.

If your idle is smooth but causes a lot of vibration in general, then it's the motor mounts...
Thanks, everyone, for bringing good information to the table. I'm sure Michaelc1220 appreciates it!

Crystal
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