Identify the SPEED CONTROL gadget....?
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Junior Member
Joined: Feb 2003
Posts: 87
Likes: 0
From: NY
Car: 1987 Iroc-z
Engine: 5.7L 350
Transmission: 700 r4
Identify the SPEED CONTROL gadget....?
What is this? What does it do? If it does anything does it create vaccumm? Should it click or move when hooked directly to a battery for testing? thx
Supreme Member
Joined: Mar 2002
Posts: 1,654
Likes: 2
From: Lower Salford, PA
Car: 1987 Camaro Z-28
Engine: 6.3L Victor EFI
Transmission: Tremec TKO 600
Axle/Gears: Moser 9"/4.11 Trac-Lok
Cruise control servo. It controls the throttle setting when the cruise control is engaged. It uses vacuum pull the throttle open & but does not create any. It has no electrical components in it, so hooking it up to battery will have no effect on it.
Last edited by Ricktpi; Apr 16, 2004 at 01:24 PM.
Supreme Member
Joined: Feb 2002
Posts: 2,308
Likes: 0
From: Avondale, AZ
Car: currently thirdgenless!!!
It does not create vacuum, it uses vacuum from either you TBI unit or your manifold (don't remember where it hook up to). The two hoses are vacuum hoses. Inside the unit is a diaphram. If your cruise control is not working and all else looks good, you may have a crack in the diaphram. Its very thin and can dry out.
Supreme Member
Joined: Apr 2003
Posts: 1,751
Likes: 4
From: Bonner Springs, KS
Car: 1995 Corvette
Engine: LT1
Transmission: 6 spd Manual
Axle/Gears: Dana 44, 3:45:1
If you have a 5.7L, I'm gonna assume you have TPI.. If you have TPI, there is a port on the side of the plenum that T's off to the HVAC and the Cruise control (there is a check valve that also serves as the "T")..
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