Detent Cable
Thread Starter
Racer
Joined: May 2004
Posts: 294
Likes: 0
From: Jacksonville FL
Detent Cable
How do you know when your detent cable is adjusted properly? I just put a new intake and carb on. But now when I press the accelerator there is a lag in the transmission taking off. Also it seems like its not accelerating as fast as it should. Any advice??
Thanks
Thanks
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
350 Th
Excerpt from HP Books "Turbo Hydra-Matic 350 Handbook":
Because this is not a routine adjustment, leave the detent system alone. However if the transmission has early or late upshifts or no shifts at all - especially at WOT - check detent adjustment.
To adjust the carburetor throttle lever type, find it's retainer bracket mounted to the intake manifold at the left rear of the carburetor. This cable usually uses a plastic snap-lock to retain the cable sleeve to the bracket. With the engine off and the throttle plates fully closed, lift up the snap-lock tab that's directly in back of the retainer bracket. Move the throttle lever to it's WOT position. Make sure the cable sleeve fits flush against it's bracket. Now push the snap lock tab flush with the retainer and release the throttle lever. The cable should now be adjusted.
Because this is not a routine adjustment, leave the detent system alone. However if the transmission has early or late upshifts or no shifts at all - especially at WOT - check detent adjustment.
To adjust the carburetor throttle lever type, find it's retainer bracket mounted to the intake manifold at the left rear of the carburetor. This cable usually uses a plastic snap-lock to retain the cable sleeve to the bracket. With the engine off and the throttle plates fully closed, lift up the snap-lock tab that's directly in back of the retainer bracket. Move the throttle lever to it's WOT position. Make sure the cable sleeve fits flush against it's bracket. Now push the snap lock tab flush with the retainer and release the throttle lever. The cable should now be adjusted.
Thread Starter
Racer
Joined: May 2004
Posts: 294
Likes: 0
From: Jacksonville FL
Thanks for the help. I did it just like you said. But heres the problem. The car is still lagging on take acceleration. It seems like the transmission is not fully engaging, and some times it keeps trying to shift back and forth between gears? Is this a problem with the cable adjustment or something else?
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
I dont know but I thought that in 1980 they used the 350C with the lockup torque converter. If so, the torque converter might be the problem.
I had an 80 Chevy truck that kept "hunting" for the right gear. It wound up bing the lockup torque converter. The truck had about 80,000 HARD miles on it.
PS: I fixed it with a 400TH
I had an 80 Chevy truck that kept "hunting" for the right gear. It wound up bing the lockup torque converter. The truck had about 80,000 HARD miles on it.
PS: I fixed it with a 400TH
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Tech Contributor
Joined: Aug 1999
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From: At my Bar drinking and wrenching in Lafayette Colorado
Do 3 things:
1. Make sure you have connected the vacuum modulator line to a manifold vacuum source on the carb and not a ported vacuum source. A ported source for the tranny will make the tranny act very strange.
2. Measure the distance from the primary throttle shaft centerline to the cable attach point on the old carb throttle lever and compare that to the new carb throttle lever. If the distance from the centerline of the throttle shaft to the cable attach point is different on the 2 carbs, transmission behavior will be different.
3. I agree with Gary - If your timing is off, it will affect tranny shift points, acceleration, and overall feel of the car. Timing makes a huge difference, and you've had the distrubutor out for the manifold change. Make sure you have 36 degrees total timing and that your vacuum advance is correctly hooked up on the new carb.
1. Make sure you have connected the vacuum modulator line to a manifold vacuum source on the carb and not a ported vacuum source. A ported source for the tranny will make the tranny act very strange.
2. Measure the distance from the primary throttle shaft centerline to the cable attach point on the old carb throttle lever and compare that to the new carb throttle lever. If the distance from the centerline of the throttle shaft to the cable attach point is different on the 2 carbs, transmission behavior will be different.
3. I agree with Gary - If your timing is off, it will affect tranny shift points, acceleration, and overall feel of the car. Timing makes a huge difference, and you've had the distrubutor out for the manifold change. Make sure you have 36 degrees total timing and that your vacuum advance is correctly hooked up on the new carb.
Last edited by lars; Jan 2, 2006 at 07:44 PM.
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
Good call Lars
Originally Posted by lars
Do 3 things:
1. Make sure you have connected the vacuum modulator line to a manifold vacuum source on the carb and not a ported vacuum source. A ported source for the tranny will make the tranny act very strange.
2. Measure the distance from the primary throttle shaft centerline to the cable attach point on the old carb throttle lever and compare that to the new carb throttle lever. If the distance from the centerline of the throttle shaft to the cable attach point is different on the 2 carbs, transmission behavior will be different.
3. I agree with Gary - If your timing is off, it will affect tranny shift points, acceleration, and overall feel of the car. Timing makes a huge difference, and you've had the distrubutor out for the manifold change. Make sure you have 36 degrees total timing and that your vacuum advance is correctly hooked up on the new carb.
1. Make sure you have connected the vacuum modulator line to a manifold vacuum source on the carb and not a ported vacuum source. A ported source for the tranny will make the tranny act very strange.
2. Measure the distance from the primary throttle shaft centerline to the cable attach point on the old carb throttle lever and compare that to the new carb throttle lever. If the distance from the centerline of the throttle shaft to the cable attach point is different on the 2 carbs, transmission behavior will be different.
3. I agree with Gary - If your timing is off, it will affect tranny shift points, acceleration, and overall feel of the car. Timing makes a huge difference, and you've had the distrubutor out for the manifold change. Make sure you have 36 degrees total timing and that your vacuum advance is correctly hooked up on the new carb.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by Fireslayer26
You'll have to forigive me, I dont know much about setting the timing. You say I need 36 degrees total timing. What do you mean by this, how do you do it?
Thanks
Thanks
http://forums.corvetteforum.com/show....php?t=1059896
post 33 and 40
Last edited by bobs77vet; Jan 3, 2006 at 02:53 PM.
