[C2] Fast idle issues
Thread Starter
Intermediate
Joined: Jul 2014
Posts: 29
Likes: 7
From: PA
Fast idle issues
Hi all,
I've searched on here, but I'm not entirely sure I found what I needed. Car is a 67 427/400. Here's the problem... Car starts fine and idles high when cold. However, after the car is warm, I could usually blip the throttle to get the idle down. Now, no amount of "blips" is able to get the idle back down. When I take a look at the linkage on the passenger side, I see that the "tang" only ever touches the bottom of the plastic piece. It does not appear that it is able to touch the "steps". It does appear that the steps are worn. Hope this makes sense. So, I guess I'm looking for guidance in terms of what would solve this issue and where exactly the tang should be when the car is cold. I will certainly clarify anything if needed!
Thanks,
Tom
I've searched on here, but I'm not entirely sure I found what I needed. Car is a 67 427/400. Here's the problem... Car starts fine and idles high when cold. However, after the car is warm, I could usually blip the throttle to get the idle down. Now, no amount of "blips" is able to get the idle back down. When I take a look at the linkage on the passenger side, I see that the "tang" only ever touches the bottom of the plastic piece. It does not appear that it is able to touch the "steps". It does appear that the steps are worn. Hope this makes sense. So, I guess I'm looking for guidance in terms of what would solve this issue and where exactly the tang should be when the car is cold. I will certainly clarify anything if needed!
Thanks,
Tom
Team Owner
Joined: Feb 2003
Posts: 54,121
Likes: 9,430
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
sounds like your choke rod is sticking or broke. there are clear pictures in the service manual on how to adjust
Race Director
Joined: Jan 2003
Posts: 17,693
Likes: 3,683
From: Central Arkansas
On a cold motor and cool day, after depressing the throttle once, the tang should be resting on the top step of the cam. After starting and thoroughly warmed up, the tang should be off the cam and not touching it - and the idle speed screw is holding the throttle idle setting. The cam will be rotated out of the way of the tang by the choke rod pushing/pulling (not sure which on tri-power) the choke plate vertical (fully open).
Racer
Joined: Oct 2010
Posts: 498
Likes: 10
From: Tampa FL
On a cold motor and cool day, after depressing the throttle once, the tang should be resting on the top step of the cam. After starting and thoroughly warmed up, the tang should be off the cam and not touching it - and the idle speed screw is holding the throttle idle setting. The cam will be rotated out of the way of the tang by the choke rod pushing/pulling (not sure which on tri-power) the choke plate vertical (fully open).
Racer
Joined: Oct 2010
Posts: 498
Likes: 10
From: Tampa FL
