75 cowl Hood
Thread Starter
3rd Gear
Joined: May 2009
Posts: 3
Likes: 0
75 cowl Hood
I'm trying to get the cowl induction working properly on 75 L82. I traced the problem to the WOT switch at the gas pedal. It won't push the switch far enough to activate it. If I push the switch by hand it works. Does anyone know if they are a self adjusting switch? If so that means this switch is probably junk.
Does anyone know where I can find a new switch? The only place I could find it was at corvette cental.And they call it an automatic trans control switch. Is that what I need?
Thanks Craig
http://http://www.parts123.com/parts...~A0~~~~~A10~A1
Does anyone know where I can find a new switch? The only place I could find it was at corvette cental.And they call it an automatic trans control switch. Is that what I need?
Thanks Craig
http://http://www.parts123.com/parts...~A0~~~~~A10~A1
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
Yes, the trans kick down switch also runs the solenoid for the cowl flapper. They can be adjusted by loosening the mount bolts and sliding the switch forward or back believe.
I gave up on mine....removed the cowl flapper and have open cool air cowl induction 100% of the time. When I want to downshift, I downshift with the shifter instead of guessing whether that stupid switch will engage (or not)
There are aftermarket kickdown switches you can get that mount on the carb/throttle bracket and connect like a tv cable. these seem to be very much adjustable from the read but i have not tried one yet.
I gave up on mine....removed the cowl flapper and have open cool air cowl induction 100% of the time. When I want to downshift, I downshift with the shifter instead of guessing whether that stupid switch will engage (or not)
There are aftermarket kickdown switches you can get that mount on the carb/throttle bracket and connect like a tv cable. these seem to be very much adjustable from the read but i have not tried one yet.
Le Mans Master
Joined: Jul 2000
Posts: 6,001
Likes: 112
From: Saginaw Michigan
As I remember with my 1975, the switch under the dash that opened the cowl induction door on the hood was actuated by the accelerator pedal. The switch was self adjusting. There was a slider on the side. You could set the slider all the way to one end. The first time that you depressed the accelerator pedal all the way to the floor, it set the switch.
It may very well have been used as an automatic transmission kickdown switch as well. My '75 was a four speed. I don't know about the switch if you had both an automatic and cowl induction.
Jim
It may very well have been used as an automatic transmission kickdown switch as well. My '75 was a four speed. I don't know about the switch if you had both an automatic and cowl induction.
Jim
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
On my old 75 Auto, the switch controlled both the kickdown and the cowl flap.
I had mine removed, stripped and cleaned then refitted.
As Jim said, you move the switch all the way out ( I think ) then on first activation, ie flooring the gas pedal, it sets itself to that position. Make sure on first use, you have all carpet and mats if you have them, installed.
I had mine removed, stripped and cleaned then refitted.
As Jim said, you move the switch all the way out ( I think ) then on first activation, ie flooring the gas pedal, it sets itself to that position. Make sure on first use, you have all carpet and mats if you have them, installed.
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
The switch was self adjusting.
like I said mine is unplugged, and the cowl flapper gut's are gone. However I would like to get a responsive downshift to my trans. I might give this a try and offer the OP may consider this as well.
http://www.jegs.com/p/B-M/B-M-TH-400...48054/10002/-1
Former Vendor
Joined: Apr 2009
Posts: 766
Likes: 3
From: Charlotte North Carolina 704-394-5150
A cheap fix if it ONLY for the flapper is to cut a section of vacuum/fuel hose that will snugly fit on the arm of the switch, I have done this numerous times and works great. The thicker the rubber, the sooner it will open...like duh. This is also if the accelerator pedal when matted to the floor is allowing your carb to be fully open. I have seen many that were only 3/4 throttle when the pedal was fully pressed. Then I remove the pedal assembly, (which is a pain) and re-work it to allow full throttle, and sometimes that corrects the flapper switch issue at the same time.
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