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Discussion Starter #1
Decided to take it to Lime Rock (CT) Track for a driving school session.
Car has 77K miles and is running fine, slightly rough idle.

It currently has 5W-20 full synthetic was thinking of changing it to 5W-30 good idea - suggestions?
Should we run 5W-30 year round?

Idle is rough seems to jump up to about 900 then back down.
Planning to do plugs, clean the TB then do the relearn on the TB - any other suggestions?
Throttle response seems odd in that it is slow to drop back down, so much that
it revs a bit higher when shifting. Is there a very mild tune that will fix this
and still pass emissions?

Temp gauge is at about 11 not 12 o'clock going to put our scan tool on it and
see what's going on.

It is slightly loud inside the car, is it common for the mufflers to go so early?
 

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For throttle response I would recommend adding a ground wire to the throttle body to mitigate any electrical interference. I did this and it is night/day difference when driving the 5spd. Automatics don't see as much of a difference.

Other than that, you seem to have a grip on the idea of a 'tune up,' though I wouldn't say 5-30 is necessary. 5-20 is the factory spec weight, stick with that.

Is it loud outside the car? If not, you're probably getting harmonic vibration from a worn or improperly installed motor mount. Your 'rough idle' could be mounts as well as wandering idle is more or less part of the design and would only feel rough if the mounts are shot.
 

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Discussion Starter #3
Thanks, I do also remember seeing a video on cleaning the ground at a point
where a main lug mounts to a painted part of the body, scrape the paint and
clean it. But I will add the wire if that helps.

It does not seem real loud outside but thinking now I do hear it coming up the
driveway. It really drones inside the car.

The temp seems to really fluctuate, 180 stopped the first time, maybe not fully up to temp, then 172 driving with air flow, then 190 the second time stopped.
I could see these differences as small changes in the gauge.

Forgot to check the idle speed on the scan tool but on the tach it looks more
like 600 to 700 as how it wanders.

Is there a mild tune for an otherwise stock engine that would just make it
better to drive?
 

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There are no "canned" tunes. You'll have to contact FSWERKS or Tom (1turbofocus) to get a custom tune and a flash device.

Just add a medium gauge wire from the throttle body mounting bolt closest to the electronic controller and run it to the battery ground. Done. This is cheap, easy, and makes a difference.
 

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Hi,

I'm looking for the features and specs manual for the 2010 Ford Focus S 2.0L 4-cyl. 5-speed - a manual from Edmunds.com - perhaps someone could share a pdf? My antivirus blocks it
 

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I thought about NOLA Driving Institute first, but then checked the prices and I can't afford it now. Perhaps, I need to wait and then find a local winter driving school. Any experience? Thanks.
 

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Not saying that this caused anything.... just reporting what happened to me. I went from conventional oil to the full synthetic about 3 years ago. After a week I started throwing a code for a miss fire in Cylinder 4. When I pulled the coil it was full of oil. I ended up replacing the value cover gasket and switching back to conventional.
 
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