![]() |
![]() |
#1 |
Registered User
Join Date: Apr 2002
Location: Longmont, CO
Posts: 436
|
Unknown carb part
Okay, finally finding time to work on the old beast. Upgraded to an HEI, swapped trannies, and rebuilt and cleaned the Qjet carb. When rebuilding the carb, I noticed the module in the red rectangle in the picture, and it was hooked up to the electric wires, but not the vacuumn. I don't know what it's for, my guess is it was for a cruise control of some kind, but don't know if it's original or something a PO put on. If it is for a cruise control, there are no other components of the system in place that I know of.
So, all you truck gurus out there, help enlighten me on what this is?
__________________
------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 Longmont, CO husker95@hotmail.com |
![]() |
![]() |
![]() |
#2 |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
|
Re: Unknown carb part
that is a factory fast idle soleniod.. part of the original smog system, they usually got tossed years ago...
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Apr 2002
Location: Longmont, CO
Posts: 436
|
Re: Unknown carb part
Thanks for the info, think this one will be tossed as well since it wasn't hooked up to anything and the truck runs fine and passes the Colorado smog test.
__________________
------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 Longmont, CO husker95@hotmail.com |
![]() |
![]() |
![]() |
#4 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
|
Re: Unknown carb part
The solenoid you are showing was a dual purpose one. It was to speed up the idle for reduced emissions and to keep the idle speed constant when the AC is engaged. I would keep it if I was you as it is nice to be able to idle with the truck in gear and the AC on at a normal level. The AC also works better at idle if the truck is not idling too slow. The compressor pumps better and the fan will pull more air through the condenser for better cooling with the idle not too slow.
Charles |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Jul 2007
Location: New Castle, IN
Posts: 199
|
Re: Unknown carb part
Thanks! I was scratching my head about the same thing.
|
![]() |
![]() |
![]() |
#6 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
|
Re: Unknown carb part
I thought it was to idle up your truck when your A/C was on. Is it an AC truck
__________________
1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
![]() |
![]() |
![]() |
#7 |
Green club
Join Date: May 2002
Location: Central CA
Posts: 1,059
|
Re: Unknown carb part
I have one of those in my tool box, keeping it one day when I finally get A/C in the truck.....
![]()
__________________
71 short/fleet ECE 4/6 drop, LQ4/700r4/3.42 gears 70 SS396 Chevelle 427/200-4R/3.73posi 61 Lincoln Continental, black on black Son you are going to drive me to drinkin if you don't stop drivin that hot rod lincoln |
![]() |
![]() |
![]() |
#8 |
Senior Member
![]() Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
|
Re: Unknown carb part
Depending on vehicle they had some different applications. A/C idle up could certainly be one of them. My 72 had one and I was always under the impression that it was to eliminate dieseling. On the stock 307 it sure functioned that way. If you set the idle at the carb it would diesel like a bugger. If you set the idle at the solenoid it would activate with the key and it would idle at the set speed. Kill the ignition and the solenoid would deactivate and the throttle blades would fully close and starve the engine of air/fuel so that it couln't diesel. Worked like a charm too.
__________________
Saskatoon, Saskatchewan Canada |
![]() |
![]() |
![]() |
#9 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
|
Re: Unknown carb part
That's right. I had forgotten about them also being used as an antidieseling solenoid. Depending on how you wire it up, it could be used for an anti dieseling solenoid or idle speed up solenoid. Either way, please dont throw it away!!
Charles |
![]() |
![]() |
![]() |
Bookmarks |
|
|