Re: [GMCnet] air cleaner sensor leaks [message #324713 is a reply to message #324712] |
Sun, 08 October 2017 17:30 |
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pjburt
Messages: 436 Registered: February 2016 Location: Fresno, California
Karma:
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Senior Member |
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Jim, he's in Cal. and has a 76. It needs to work (at least look like it) every 2 years for our bi-annual emissions check.
Wish I could have made it to Paso to meet all of y'all.
James Hupy wrote on Sun, 08 October 2017 14:06If it were me, I would render the thermactor inactive in the wide open
position and eliminate the vacuum line and potential leak. We use these
coaches pretty much in the summer season, so that air cleaner flap is of
little value. Jwiwd.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 8, 2017 2:01 PM, "Jack Christensen" wrote:
I'm tracking down vacuum leaks on my 455.
The flap that allows warm air from the manifold to get to the carb and help
during startup is controlled by a sensor mounted in the air cleaner assy.
I found that the sensor seems to work properly in that when the engine is
cold, vacuum passes to the flap controller and operates it causing warm air
to enter the engine. What I also found was that when the sensor warms up
it does cause the flap to release as it should, but the sensor then leaks
vacuum when it's warm. It's not a whole lot, but more than I would have
expected. I would expect it seal off the vacuum. Is this usual or is the
sensor bad?
--
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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Jerry Burt Fresno, CA.
73 Gmc 26' Canyon Lands
Members: FMCA - GMCMI - GMCWS
A truly happy person is one who can enjoy the scenery on a detour.
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