| Re: [GMCnet] air cleaner sensor leaks [message #324718 is a reply to message #324712] |
Sun, 08 October 2017 17:40   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Sorry you live in California. I didn't think about emissions testing there.
If it was so equipped and sold as a California vehicle, then it has to be
in place and functional when emissions testing is performed. DON'T KNOW
ABOUT FIVE MINUTES LATER. 'EH'. I've been hanging out with some Canadians
lately.
Jim Hupy
Salem, Or ( we don't have emissions testing in this airshed, but, do in
Portland and Medford)
On Oct 8, 2017 3:31 PM, "Jerry Burt" wrote:
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 14:06
> If 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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--
Patti & Jerry Burt
73 Gmc 26' Canyon Lands -
77 Palm Beach
Members: FMCA - GMCMI - GMCWS - Pacific Cruisers - 49ers
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