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RPM's drop when coasting to a stop, please help.

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Old 01-15-2008, 06:00 PM
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Default RPM's drop when coasting to a stop, please help.

When I'm coming to a stop, sometimes I'll throw it into neutral and release the clutch. At about 5 MPH or less, the RPM's will drop and the engine will bog for about a second. If I open the clutch, then everything's normal. I've tried to see if I have a misfire (none) and I've used STP intake cleaner (as per another thread). Any info would be great. TIA guys!
Old 01-15-2008, 06:17 PM
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when was the last time you checked your plugs?
Old 01-15-2008, 06:27 PM
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Default normal.

if it helps, I'm running some 1 range colder plugs, and I don't seem to have it; do you have stock plugs?

I'll let you know if a couple of weeks after I've had a good chance to check.
Old 01-15-2008, 07:01 PM
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Default They said they checked them on the 60K...

...and I'm at about 65K. I'll replace them anyway, what could it hurt? Thanks Slowest and quickaudi!
Old 01-15-2008, 07:04 PM
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Normal? I don't think so.... From my experience, the S4 engine maintains idle very well.
Old 01-15-2008, 07:23 PM
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"open clutch" = pedal up or down?
Old 01-15-2008, 07:42 PM
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Default check brake booster hose.

mine will drop a few RPMs also as it gets down to 5 MPH if my foot is on the brake.
Old 01-16-2008, 06:34 AM
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existed in some form in 3 of the S4s that I've checked.
Old 01-16-2008, 06:45 AM
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I have it. I've read about it a lot in the archives, too. seems common.
Old 01-16-2008, 07:35 AM
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Both my S4s do/did it, but not too much. Maybe 100 rpm.


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