idle stop solenoid
Thread Starter
Racer
Joined: Sep 2002
Posts: 389
Likes: 0
From: san diego ca
Here's another common point of confusion. The octane rating scale in North America changed in the mid-70s. The old system rated fuel by Research Octane Number (RON), the new system by Anti Knock Index (AKI).
91 RON (as mentioned in your manual) is the same as 87 AKI.
All Corvettes from '71 onwards were federally mandated to run on regular gas. That's why the compression ratios dropped substantially and ignition curves became so conservative.
91 RON (as mentioned in your manual) is the same as 87 AKI.
All Corvettes from '71 onwards were federally mandated to run on regular gas. That's why the compression ratios dropped substantially and ignition curves became so conservative.
Great resource this forum is...yep.
Melting Slicks
Joined: Mar 2007
Posts: 2,520
Likes: 11
From: Hinckley OH
I think that part of the confusion is caused by the function being year specific. In my 81 the solenoid was activated when the A/C was turned on. On my 73, the solenoid is activated when you turn the ignition on. It's referred to on the 73 as an anti-dieseling solenoid. Essentially the same part with a different function, though functioning in the same manner.
On early smog engines it was to close the throttle to prevent run on and on later engines they used the same solenoid to bump up the idle speed when the air conditioner was on.
