[T3] cool weather idle hunt
Bobsnotch at aol.com
Bobsnotch at aol.com
Tue Jan 10 19:56:30 PST 2017
In a message dated 1/10/2017 6:31:57 P.M. Eastern Standard Time,
d.nohejl at gmail.com writes:
New theory: my lope/hunt a few minutes after cold start and the
intermittent low lope when warm are caused by the same thing, the AAR. Could it be so
that the AAR is too open when cold and intermittently closes too much when
warm so that my base idle setting will all of a sudden be too low for the
more closed AAR? And that when the AAR opens up a wee bit more my idle
comes back?
I guess I’m wondering if that’s mechanically possible or sounds at all
reasonable.
Yes and No. Yes the AAR can cause the loping idle when warm, but, that's
only because the AAR is almost closed. Usually the loping idle is swinging
from bumping up to the 1400 rpm rev limit, and dropping off to around 750 to
800 rpms (just bouncing between the 2). A low idle loping sounds like
something is off in the timing or elsewhere.
Now, if the AAR is not closing fully, the idle speed will still be higher
than normal, and if the idle speed was set while the AAR was still open it's
possible that when the valve closes (your intermittent low idle), that you
would see a low idle condition. Personally, I've never run into this
situation, as mine has always been too high of an idle speed.
I don't know if this helps or not.
Bob 65 Notch S with Sunroof
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