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Thread: 2008 SES - Rough Idle Reply to Thread
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Topic Review (Newest First)
10-21-2012 08:25 PM
sdg3205
Update

Some very unnerving findings today.

1. The spark plugs were toast.
[IMG][/IMG]



The car has 100,000 Km on it and i bet these are original. We bought second hand but it goes to show you can't depend on PO's for good service history.

2. One of the spark plug wells was COMPLETELY full of oil. Is a new valve cover gasket kit required?

Thanks folks!
10-20-2012 10:13 PM
sdg3205
Quote:
Originally Posted by GMconvert View Post
Sounds like a vacuum leak...
Thats what i think, too. Not enough sweet vacuum love'n to go around when the brake is pressed.
10-20-2012 10:12 PM
GMconvert Sounds like a vacuum leak...
10-20-2012 08:11 PM
sdg3205 Still haven't had time to service the car, however I've noticed the idle only gets touch when my foot is on the brake whilst in drive. if i put on the parking break and take my foot off the brake idle resumes a health 750 rpm.
10-16-2012 12:27 PM
sdg3205 I'm doing a Focus service day tomorrow.

I'm picking up some Mercon LV today, so tomorrow the tranny fluid and filter gets changed, the plugs get changed and re-gapped, ECU gets reset, MAF sensor gets cleaned. Will it help? Probably not but it will cost less than $200 before i give up and go to ford. At least the door locks dont seem to stick anymore.

My 1981 DeLorean runs smoother than my wifes focus. I do love the focus though. Very comfortable to drive, great on gas, looks nice inside. I drove (and still have) a 2000 Jeep Wrangler. Getting back into the Jeep feels archaic compared to the Focus.
10-16-2012 12:18 PM
FordService
Quote:
Originally Posted by sdg3205 View Post
...If I'm waiting at a light the idle is quite rough, with about 300 rpm fluctuation. Runs fine at speed. Happens in Park or Drive, with or without AC. It has been gradually getting worse. The car has 100,000 KM (62,000 miles)...
Hi sdg3205,

Swing by your dealership so they can inspect. Ford certified techs are specially trained to diagnose and repair your Focus.

Quote:
Originally Posted by Minchkin View Post
IIRC, the idle fluctualtion is the ECU trying to find the idle sweet spot. And AFAIK, all of the 2nd gen cars do it. It could be an engine mount going bad. How low is the RPM?
Quote:
Originally Posted by sdg3205 View Post
...it seems to drop a little below 500 rpm when fluctuating. I'll get some more exact number in a bit.

I'm going to grab some MAF sensor cleaner and 4 new plugs after work today.

Just had the oil and air filter changed.
Quote:
Originally Posted by Minchkin View Post
That should improve the efficiency of the motor, but I doubt it will help the idle issue. Basically the ECU is trying to lower the idle speed till it senses a stall. Then it jumps back up. Rince/repeat, causing the uneven idle.
Quote:
Originally Posted by Miller88 View Post
Mine idles smooth as glass. Occasionally, it'll drop down to 400 for a second, then recovers quickly. Only once has it actually stalled.
Thanks for all the good info, folks!

Crystal
10-14-2012 09:55 AM
badazz2010focus It's a pain in the ass is what it is........LOL!
10-14-2012 12:39 AM
Minchkin Mine has dropped to 200 before I revved hella quick...
10-14-2012 12:23 AM
Miller88 Mine idles smooth as glass. Occasionally, it'll drop down to 400 for a second, then recovers quickly. Only once has it actually stalled.
10-13-2012 08:39 PM
Minchkin That should improve the efficiency of the motor, but I doubt it will help the idle issue. Basically the ECU is trying to lower the idle speed till it senses a stall. Then it jumps back up. Rince/repeat, causing the uneven idle.
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