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Old 07-16-2014, 02:46 PM   #1
Warpedlogic
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05 ST intermittent idle issues

I'm starting to think the past owners of this car knew something and didn't tell me.

I'm now getting some odd idle behavior intermittently. When I push the clutch in to come to a stop, the RPMs will shoot up to 2.5-3k for 5-10 seconds then drop to normal. Also when at a light, the idle will sometimes be rough and low, almost like it wants to die but it doesn't. Also, apparently I'm getting small random power losses right after shifting into a gear, but this is very random.

These don't happen every drive cycle, but definitely does on longer drives. I'm also not getting a CEL for this. Any ideas would be much appreciated.


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Old 07-16-2014, 09:20 PM   #2
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What RPM are you at in gear when pushing in the clutch while coming to a stop?

Maint. history? (plugs, fuel filter,coil boots)
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Old 07-16-2014, 11:07 PM   #3
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05 ST intermittent idle issues

Thanks for the reply!!

When pushing in the clutch, it's usually around 1.2 to .9k rpm depending on the gear.

I don't have any maint history for the vehicle and carfax db wasn't used by any places that did work on it. I know oil was done at 114k and I just did it again. I am hoping to do plugs soon. Alt was done also recently by ford (ouch!!)

Cel also just came on tonight and it's p0171 (too lean).

Last edited by Warpedlogic; 07-16-2014 at 11:32 PM. Reason: cel info
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Old 07-16-2014, 11:34 PM   #4
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Just wondered how low you let it get before clutching as the IAC might come into play even more trying to bump it up at lower RPM.

These ALL have an "idle hang" thing related to emissions, I didn't realize RPM was bumping up at every shift until I installed a cluster with a tach. and learned to back off the gas before clutching & shifting. When you take your foot off the gas, it takes a while B4 it starts to slow down much - you can feel when it finally starts to slow.

I know I get a typical bump up when clutching, just isn't as much so I pay little attention to it now.

Checking the throttle body/cable setup to make sure it doesn't hang up is fairly easy to do, had to clean mine when it started sticking at idle (hard push to release & get moving). Rag & maybe some MAF cleaner to do the trick if it's gunked up, carb cleaner is usually too nasty for the plastic there.

maint. may help the occasional poor idle, wouldn't worry much until you have a chance to catch up on that.

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Old 07-16-2014, 11:42 PM   #5
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I've noticed the idle hang stay at the last rpm it was at just before clutching in before all of this. Throttle doesn't seem to be sticking at all. Before this happens in the drive cycle, and even during, throttle responds right away. But I will add that to the list of things to check. Thank you sir!
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Old 07-19-2014, 08:21 AM   #6
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Follow-up:

The TB spring and cable looks good and nothing seems to be binding when the accelerator is pressed. This week I also got a P0300 (random misfire) and when sitting at a light it decided to randomly rev to 3k a few times after it'd been down to idle for a min. I'm also hearing a kind of air venting for a second or two when I shut down the engine. I've done a lot of research....how likely is it this is the PCV hose?
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Old 07-19-2014, 02:01 PM   #7
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Quote:
Originally Posted by Warpedlogic View Post
I'm also hearing a kind of air venting for a second or two when I shut down the engine. I've done a lot of research....how likely is it this is the PCV hose?
imo, a distinct possibility given your intermittent erratic idling problems.
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Old 07-19-2014, 10:20 PM   #8
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Agreed

And whenever anything drops idle too low (whether a miss from old plugs or a vacuum leak like the PCV) the IAC will try to compensate. When the problem goes away the idle speed could spike before the adjustment catches up. (Almost dies, throttle opened, catches & zooms B4 returning to normal)
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