Re: PCM or ETC Throttle Body?
Posted to Technical Discussion Forum on 6/13/2014
1 Reply
Hey Peter,
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My thought there was that since idle is controlled by the
throttle body, and idle quality is poor, my throttle body
may be bad electrically or even mechanically. I've heard you
can damage them by holding them open while cleaning.
But seeing the 76% pid made me question the pcm.
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No, its a speed density engine. I really didn't think a
vacuum leak would be problematic here.
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Vacuum is steady and normal, until the surge of course, but
any change in airflow whether it be a misfire or a change in
idle speed, will move the gauge needle. Which tells me what
i already know. I may have to check static/running
compression check as a last resort. I just feel like thats a
shotgun approach to diagnostics.
One thing i did notice is that LTFT seems to continue to
follow STFT. Seems like LTFT never settles in, but they are
no abnormally high, and return to 0 at wot.
Bank 1 o2 signal seems to switch much faster and more
erratically than than bank 2, however bank 1 is a new
sensor.
I may have to just scope them all and do the compression
checks like you suggested. Im just fixated on the throttle
pid being too low.
Thanks for the response Peter
Kevin Mowdy Technician USMC-Exercise Support Division Yucca Valley, California, USA
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