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Old 03-09-2014, 02:38 PM   #1
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rough idle

I've been searching different forums to answers about our rough idle issues. My wife's 2011 GT had the CEL come on with a code of PO174, Lean Condition on Bank 2. I tried to locate a vacuum leak but couldn't find one. I ran a can of Sea Foam through it thinking maybe an injector was plugged up. The car has something over 50K miles on it. I did the Idle Relearn to no avail. Anyone have any ideas? Could it be a faulty IAC? Other than the idle and the CEL, everything seems normal, runs good.
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Old 03-09-2014, 02:51 PM   #2
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These cars don't have IAC valves. Stock? Tuned? Did you address the code?
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Old 03-09-2014, 02:53 PM   #3
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Thanks, I wondered about that. I replaced the IAC on my '97 and my wife's '01 but was curious whether this one had one or not.
Car is bone stock. Still haven't figured out how to address the "Lean Condition". Like I said, I haven't located a vacuum leak and don't know for sure how to correct the lean condition.
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Old 03-09-2014, 02:59 PM   #4
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That's dark age technology, like a tickler valves on a carburettor. Check your intake for leaks. I'll often run a propane torch around the joints (unlit, of course) as, if there is a leak, it'll make the idle jump.

Any work done recently on the car? I'd start pulling some plugs and doing basic engine diagnostics, compression check, plug condition, etc. if I was out of warranty and on the hook for the work. You are still on 5 year PT so, you may wish to let Ford address your issues.
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Old 03-09-2014, 03:02 PM   #5
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Ha! Some of old timers are pretty familiar with "dark age technology", hence the old Ford truck. If this thing is still under PT warranty, I'm all over that. Thanks for the heads up.
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Old 03-09-2014, 03:41 PM   #6
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Doesn't hurt to ask. The car has a fair bit of miles and that might affect their decision but, try anyway.

This ain't my first rodeo either, I've been at this for over 30 years. These are the good old days, in case nobody noticed.
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Old 04-07-2014, 12:19 PM   #7
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My 14 GT just started doing it. It has just over 2000 mi and sometimes while stopped it gets as low as 100 RPM (almost Stalling) and catches back up. Most of the time is fluctuates between 800 and 500.

Could the weather have anything to do with it?
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Old 04-07-2014, 12:34 PM   #8
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Check where your intake connects to your tb.. mine was loose and fluctuated my rpms like crazy. While I drove it was fine but at idle it was noticeable
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Old 04-07-2014, 12:46 PM   #9
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Quote:
Originally Posted by GE3G View Post
Check where your intake connects to your tb.. mine was loose and fluctuated my rpms like crazy. While I drove it was fine but at idle it was noticeable

Wow dude, almost right in the money. Checked the intake and the filter element was ever so slightly of place showing a little of the tube. Thanks!!
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Old 04-08-2014, 02:40 AM   #10
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Nah that's just the 700 lift cam on a 106 lsa with 18:1 compression you're feeling. Perfectly normal.

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