|
|
|
|
| Author |
|
|
Registered
Join Date: May 2002
Location: Maryland
Posts: 98
|
Deceleration valve?
I'm trying to identify a valve that controls the manifold vacuum in a '79 SC. The deceleration valve is supposed to slow down the vacuum enough to keep the idle from dropping (from a high RPM) below a point where it stalls. Is this the valve?
__________________
Rich '79 911 SC |
||
06-13-2002, 05:49 PM
|
|
|
Registered
Join Date: May 2002
Location: Maryland
Posts: 98
|
Sorry, the image didn't work the first time. I'll try again:
__________________
Rich '79 911 SC |
||
|
06-13-2002, 05:51 PM
|
|
|
Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
|
That's it! I always assumed it was there to keep the engine speed from dropping too fast when one lifts the throttle and dumping a bunch of unburned gasoline into the exhaust. I think it's main purpose is emissions control. Jim
Last edited by Jim Sims; 06-13-2002 at 06:08 PM.. |
||
|
06-13-2002, 06:05 PM
|
|
|
Senior Member
Join Date: Jan 2001
Location: Left Coast, Canada
Posts: 4,572
|
Exactly, Jim!
It's another annoying little part, that is easily disabled by removing and pluging the vacuum hose that connects to it.
__________________
'81 SC Coupe "Blue Bomber" "Keep your eyes on the road, and your hands upon the wheel."- J.D.M. |
||
|
06-13-2002, 06:12 PM
|
|
|
Registered
Join Date: May 2002
Location: Maryland
Posts: 98
|
Thanks guys!
I can see the adjustment on top of the valve. But, how do you determine the correct setting?
__________________
Rich '79 911 SC |
||
|
06-13-2002, 06:34 PM
|
|
|
Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
|
Do a search; I seem to recall John Walker explaining the adjustment sometime in the past. Jim
|
||
|
06-13-2002, 08:11 PM
|
|
|
