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Old 07-28-2014, 10:30 PM   #1
maalox
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5-speed manual owners - Highway driving and rough idle

I've been having two minor drivability issues lately, and I'm curious if anyone else has seen anything similar. Here they are:

1. After driving for extended periods on the highway and exiting to surface roads, the car idles rough. The first stoplight after exiting the highway is usually the worst, and the rough idle is usually accompanied by a quick drop in idle speed(like a miss). Sometimes the car will bog a little when pulling away from the light. The local dealer has looked at this a few times, and always "no problem found / could not duplicate".

2. When accelerating on the highway in 5th gear, there is noticeable vibration from the drivetrain. It feels like a wheel is way out of balance. It's most pronounced between 60 and 70 mph, and only occurs when under load. No vibrations under braking or when coasting in gear.

Has anyone experienced either of these issues, and if so, any luck in resolving them? Thanks.


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Old 07-29-2014, 04:48 AM   #2
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1. sounds like an air problem. idle air valve could be dirty and sticking, or a vacuum leak somewhere
2. sounds like engine mount. does the vibration change with vehicle speed, engine speed?
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Old 07-29-2014, 11:46 AM   #3
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Quote:
Originally Posted by thenorm View Post
1. sounds like an air problem. idle air valve could be dirty and sticking, or a vacuum leak somewhere
IAC problems wouldn't throw a DTC? I'll check for vacuum leaks.

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2. sounds like engine mount. does the vibration change with vehicle speed, engine speed?
Dogbone mount is from a Focus Electric, other mounts are stock with an easy(I don't beat on the car) 27K miles. The vibration is load-dependent, so it's at it's worst when maintaining highway speeds(~65mph) on long uphills.
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Old 07-29-2014, 12:33 PM   #4
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The IAC all but completely failed in my Sport Trac, and I never got a CEL. The last time I had a car vibrate / shake under load was when my Speed6 lost a coilpac, but that definitely threw a CEL. Maybe a spark plug? Normally, any kind of disruption to ignition will throw a CEL for misfire, but maybe not 100% of the time.
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Old 07-29-2014, 01:45 PM   #5
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Honestly I've noticed these cars idle more rough than most cars I've driven. At least in the class of car. Mine idles a little rough every so often. I never have had any actual problems from it though. We also have to remember if you have mods like exhaust and being lowered can also add to a more rough feeling ride.
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Old 07-29-2014, 05:17 PM   #6
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Mine idles rough when coming to a stop even when I was never on the HW. It will shake and the RPM will dip a little below idle speed.

I also have the focus electric lower mount and sometimes feel the vibrations in the drivetrain like you were saying. I think the more load on the engine, the more vibrations.
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Old 07-30-2014, 01:07 AM   #7
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My 2012 5sp hatch has had the intermittent rough idle since the day I bought it. The sales rep claimed it was a characteristic of direct injection engines...
Going to get a K&N and do the snorkel delete, hopefully it helps.
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Old 07-30-2014, 06:12 AM   #8
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I am pretty sure the 2012+ does not have a IAC since its fly-by-wire.
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Old 07-30-2014, 11:19 AM   #9
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This is what I was informed of as well. The electronic throttle body seems more plausible with most peoples hesitations under throttle. However, if one is going up hill at 40mph in 5th gear...most would just suggest shifting down. Depending on the hill some might actually choose 3rd :-)
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Old 07-30-2014, 01:14 PM   #10
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Quote:
Originally Posted by trahker View Post
My 2012 5sp hatch has had the intermittent rough idle since the day I bought it. The sales rep claimed it was a characteristic of direct injection engines...
Going to get a K&N and do the snorkel delete, hopefully it helps.
It likely won't.
I have the K&N typhoon and snorkel delete. My car idles rough as well. It always had, but became more noticeable after the E-RMM install. I was actually going to double check it today and make sure nothing came loose.
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