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Old 11-05-2012, 01:14 PM   #61
NCFocus12
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For anyone experiencing rough idle, RUN PREMIUM GAS. It's the same as a Mercedes, just worded for MARKETING. MB will RUN on 87 but not run WELL. It's marketed to run premium because most MB owners want performance and smoothness, not to save 10 cents at the pump.

Ford says the Focus is desigend to run on 87. It WILL, but it will BOG and be ROUGH. The manual says it will run PREMIUM for BEST PERFORMANCE. I've tried both, there is no comparison - WAY smoother, NO bogging, BETTER economy on premium.

For the OP - with your idle running between 200-700, and the suggestion that you clean the throttle body, I;d say FIRST run an entire large bottle of Techron with a tank of Shell Vpower, and see if it doesn't clear up.

It's interesting, I'm used to a community of performance-minded MB owners who would never run generic gas (Mur-fee, Cost-crud, etc) but I suspect being an economy car, a lot of Focus owners buy the cheapest garbage du jour they can find. BAD IDEA. I ran my MB on "generic" premium gas one time, and it began chugging LITERALLY before I left the parkign lot. If you've been running garbage, or a mix of garbage and whatever you can find for 2 cents less a gallon, STOP!

Techron is very good at cleaning up these messes. I suggest doing what I said, and rinse, lather and repeat once more if it still hasn't cleared up. After that, never, ever run generic gas again, run Shell 93 or Chevron 93
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Old 11-05-2012, 01:29 PM   #62
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Quote:
Originally Posted by NCFocus12 View Post
[...]not to save 10 cents at the pump.
10 cents? Where do buy your gas?

EDIT: But seriously, premium is like usually 24+ cents more expensive a gallon than 87 - at least where I live and depending on the gas station, etc.
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Old 11-05-2012, 01:57 PM   #63
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10 cents? Where do buy your gas?

EDIT: But seriously, premium is like usually 24+ cents more expensive a gallon than 87 - at least where I live and depending on the gas station, etc.
So let me get this straight - you spend 20k on a car, you want it to run as well as possible, and $2.50 extra per TANK is too much for you to spend, nevermind the fact that you will get 10% better mileage, which means an extra 30 miles or so per tank, and your car will stop vibrating your ass while you drive?

That reminds me of my dad, who used to stockpile and FREEZE McDs hamburgers in the early 80s, just because they ran 25 cent burger days.

Being a cheapskate is never beneficial to your (or your car's) existence in the long run
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Old 11-05-2012, 03:26 PM   #64
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Quote:
Originally Posted by NCFocus12 View Post
Being a cheapskate is never beneficial to your (or your car's) existence in the long run
I doubt that opting for 87 octane vs. 91-93 octane has near the impact on the car's existence as a stockpile of McD's burgers has had on your father's.

Just sayin'.

Seriously though... I do believe in using top-tier fuel in a GDI engine but, unfortunately, the only thing that Techron or other additives have a chance to clean in a GDI engine is the injectors and combustion chambers. It would have no cleaning effect on possible valve deposits that could also affect idle.
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Old 11-05-2012, 03:38 PM   #65
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Quote:
Originally Posted by NCFocus12 View Post
So let me get this straight - you spend 20k on a car, you want it to run as well as possible, and $2.50 extra per TANK is too much for you to spend, nevermind the fact that you will get 10% better mileage, which means an extra 30 miles or so per tank, and your car will stop vibrating your ass while you drive?

Being a cheapskate is never beneficial to your (or your car's) existence in the long run
¡Cálmate! I run premium (and ethanol-free) as often as I can! I was merely saying that premium isn't 10 cents more than 87 where I live...

Quote:
Originally Posted by TboneZX3 View Post
I doubt that opting for 87 octane vs. 91-93 octane has near the impact on the car's existence as a stockpile of McD's burgers has had on your father's.

Just sayin'.
Hehe... ^_^
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Old 11-05-2012, 03:43 PM   #66
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The Issues:

1) The newer Focii with the stiffer motor mounts have a consistent vibrating idle, audible throughout the cabin, but it is stable and consistent. You definitely know when the car is running, and it feels cheap. (Rental Experience)

2) The older Focii have softer mounts. The idle is quiet and smooth normally, but occasionally there is shuttering that is felt throughout the car. It is inconsistent, the RPM's go +50, and it is especially noticeable with AC cycles or during a cold start. It feels like the engine is missing a beat.

The Problem:
1) We no longer have carbs, there is no "screw" for the mechanic to adjust. There are no tuning points.
2) Because of #1 the dealerships hate this kind of issue, so they "hook up their computers" and realize the check engine light is not on and call it normal.
3) The real problem (clogged injector, out of balance flywheel or clutch, out of tolerance spark plug, improper air/fuel mixture, motor mount problem, fuel problem) is not diagnosible without commitment from a service mechanic which has NO reimbursement from Ford if chargeable work cannot be done.
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Old 11-08-2012, 11:34 AM   #67
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Hey Fanatics,

If you're experiencing rough idling, please reach out to me via PM so I can look into some options for you. All I need is your VIN, dealer, mileage, daytime phone number, and full name; I'll start investigating. I'm also happy to answer any other questions or concerns you may have - just send me a PM!

Thanks,
Crystal
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Old 11-10-2012, 12:33 PM   #68
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Problem fixed by me! Visually checked the motor mount and it looked clean. Got some approved throttle body cleaner and found the throttle body to be really dirty. Once clean I started and took it for a spin to warm up. Noticed right away on acceleration that it was much better. I then let it idle with my little code clearing device hooked up because it has a digital tach and observed no more than +/- 25 rpm @ about 700 in drive. Smooth and steady just like new. IT TOOK ME TEN MINUTES! Why couldn't Ford do this? So now they have a customer who will never buy Ford again. I don't get it! When I think of the time I wasted!
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Old 11-10-2012, 01:29 PM   #69
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How many miles with your dirty TB?

Thanks
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Old 11-10-2012, 01:37 PM   #70
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Quote:
Originally Posted by tjbischoff View Post
Problem fixed by me! Visually checked the motor mount and it looked clean. Got some approved throttle body cleaner and found the throttle body to be really dirty. Once clean I started and took it for a spin to warm up. Noticed right away on acceleration that it was much better. I then let it idle with my little code clearing device hooked up because it has a digital tach and observed no more than +/- 25 rpm @ about 700 in drive. Smooth and steady just like new. IT TOOK ME TEN MINUTES! Why couldn't Ford do this? So now they have a customer who will never buy Ford again. I don't get it! When I think of the time I wasted!
Not sure how this is relevant since your car is listed as a 2009 and this discussion was for the 2012 Focus with the direct injected 2.0 L duratec i4 rather than the port injected version used in the older car.

How many miles before the egr causes the throttle body to get dirty? That seems to be less likely the issue with the newer cars with 1-2 years of service and under 50,000 miles.
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