| [GMCnet] Vacuum, et al, hose routing [message #112263] |
Mon, 17 January 2011 17:49  |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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THE SITUATION:
1) Some P.O. of "The Money Pit" did some strange stuff
with the tubing in the engine compartment. The line
from the "output" of the canister at lower right side
of engine compartment is apparently run to the "extra"
port on the incorrect 3-port fuel pump. This line is
clamped off with a Ty-Wrap placed on a doubled part
of the line, effectively blocking both directions!
Where is the output line from the canister supposed
to go? I suspect it may be supposed to go to a port
at the rear of the carburetor which currently is
vacant.
2) The Thermostatic Vacuum Switch (TVS) on the intake
manifold that is to the left and rear of the thermostat
has the bottom two ports broken off and the top port
vacant. I have the Service Manual and can see the line
routing on Page 6T-7. I haven't matched up where all
of the lines go. I see that the top port "D" is to feed
back to the distributor vacuum advance at the rear of
the distributor. I imagine that locating the destination
for the line from port "C" will be pretty obvious as long
as some P.O. hasn't fooled around and removed its intended
destination. I am most perplexed as to where the line
from port "MT" from one side of the "TEE" goes.
3) I assume that the TVS is needed as part of the smog
package. Is the TVS still available? If it is not,
what is required to ensure proper carburetor operation?
4) I have a new canister to install when temperatures
improve a bit for more comfortable crawling around on
the driveway on my back!
Suggestions gratefully accepted!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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| Re: [GMCnet] Vacuum, et al, hose routing [message #112268 is a reply to message #112263] |
Mon, 17 January 2011 18:45  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| k2gkk wrote on Mon, 17 January 2011 18:49 |
THE SITUATION:
1) Some P.O. of "The Money Pit" did some strange stuff with the tubing in the engine compartment. The line from the "output" of the canister at lower right side of engine compartment is apparently run to the "extra" port on the incorrect 3-port fuel pump. This line is clamped off with a Ty-Wrap placed on a doubled part of the line, effectively blocking both directions!
Where is the output line from the canister supposed to go? I suspect it may be supposed to go to a port at the rear of the carburetor which currently is vacant.
2) The Thermostatic Vacuum Switch (TVS) on the intake manifold that is to the left and rear of the thermostat has the bottom two ports broken off and the top port vacant. I have the Service Manual and can see the line routing on Page 6T-7. I haven't matched up where all of the lines go. I see that the top port "D" is to feed back to the distributor vacuum advance at the rear of the distributor. I imagine that locating the destination for the line from port "C" will be pretty obvious as long as some P.O. hasn't fooled around and removed its intended
destination. I am most perplexed as to where the line from port "MT" from one side of the "TEE" goes.
3) I assume that the TVS is needed as part of the smog package. Is the TVS still available? If it is not, what is required to ensure proper carburetor operation?
4) I have a new canister to install when temperatures improve a bit for more comfortable crawling around on the driveway on my back!
Suggestions gratefully accepted!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
|
Mac,
Forget about the TVS. Unless you are someplace that a visual inspection is required before an emissions cert (aka smog test).
The idea with a TVS and some other parts was to make the engine run wrong because often an engine with the timing retarded had lower HC and CO because the fire was still burning when the exhaust valve opened.
Most of these plans did nothing good for engine life or fuel rate, but it got them under the grams/mile (very early it was PPM).
The extra port on the fuel pump can be plugged. As near as I have been able to determine, some families of Olds had a fuel and vapor trap system to prevent vapor lock and that involved a return line to the fuel tank. The canister purge does go to the port at the card base.
I have always been in favor of protecting the environment, but from a holistic point of view. If you have to make it run poorly and use more fuel to pass the test, then the plan is basically flawed or the test must be wrong. So much for "emission controls" until about 1985.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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