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Old 08-24-2010, 06:48 PM
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Weber carb suddenly going to WOT

First time poster....... I just bought a 67 Camaro with a brand new Weber carb sitting on the just rebuilt 350 with a mild Crane cam etc......... the problem I need help with, at a dead stop (stop light) if you you just touch the pedal, it floors it's self and I have to stand on the brake and pump the pedal to get it to release. It has two new hefty springs on the throttle linkage. I am not familiar with the cam and linkage that appears to be attached to the primary/Choke flap any help would be greatly appreciated.

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Old 08-24-2010, 07:33 PM
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Sounds like you have an evil engine! . lol. Check to make sure all the linkage is moving freely and the springs pull the throttle closed. This doesn't seem possible to me though. LOL
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Old 08-24-2010, 07:56 PM
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Ah yes . You seem to have the geometry messed up on where you have the springs connected to the carburetor in relation to where you have them anchored on the intake , creating a cam-over effect . Leave the engine shut off and work the throttle by hand at the carb and see what is happening . Let me know what you find , please .
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Old 08-24-2010, 07:59 PM
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Quote:
Originally Posted by adantessr
Ah yes . You seem to have the geometry messed up on where you have the springs connected to the carburetor in relation to where you have them anchored on the intake , creating a cam-over effect . Leave the engine shut off and work the throttle by hand at the carb and see what is happening . Let me know what you find , please .
BTW . If this doesn't work . Post a picture of the carb linkage and I'm sure someone will figure it out
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Old 08-24-2010, 08:38 PM
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The springs closes the linkage with a fair amount of pressure, they are almost running straight back on the same horizontal plane as the cam on the linkage, I've manually moved the rod connected to the linkage and It didn't "cam over" it only moved slightly and when I released it it snapped back to the closed position. When I moved it full cycle, I heard the accl pump squirt fuel into the throat and it snapped back to the full closed/normal position. This WOT situation has happened several times.
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Old 08-24-2010, 08:54 PM
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Quote:
Originally Posted by EOD Guy
The springs closes the linkage with a fair amount of pressure, they are almost running straight back on the same horizontal plane as the cam on the linkage, I've manually moved the rod connected to the linkage and It didn't "cam over" it only moved slightly and when I released it it snapped back to the closed position. When I moved it full cycle, I heard the accl pump squirt fuel into the throat and it snapped back to the full closed/normal position. This WOT situation has happened several times.
What concerns me a lot is that you say it has two new HEFTY springs . I have never had to use a hefty spring . It sounds to me like they need to be mounted farther from the center of the throttle plate shaft , and as close to vertical as you can get them on the carb .
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Old 08-24-2010, 08:55 PM
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I would still like to se a picture of the setup.
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Old 08-25-2010, 06:29 AM
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The stock linkage can bind up if the engine has an excessive amount of rock to the motor mounts, or if a mount is broken.
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Old 08-25-2010, 08:39 AM
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Had the same thing as what Cobalt just talked about.. Had an engine mount give up the ghost on me and the thing would go to W O Throttle as you just touched the pedal.. Gotta be careful with this esp. in traffic or going up a hill with cars in front.. A bit scary if you are not used to it.
Take care and check it out real quick!!
T.
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Old 08-25-2010, 10:17 AM
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Quote:
Originally Posted by cobalt327
The stock linkage can bind up if the engine has an excessive amount of rock to the motor mounts, or if a mount is broken.
Good catch , cobalt . I forgot that a '67 would still have linkage instead of cable . Does sound like a broken driver's side motor mount . Didn't we used to wrap a cable around the exhaust manifold and tie it around the frame . I know I did , just for insurance .
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Old 08-25-2010, 12:41 PM
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Quote:
Originally Posted by bigdog7373
Sounds like you have an evil engine! . lol.
Actually, it sounds like he has a Toyota engine...
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Old 08-25-2010, 01:09 PM
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Quote:
Originally Posted by joe_padavano
Actually, it sounds like he has a Toyota engine...
Heeeeeee Heeeeeeee Heeeeeeee ! Wish I had thought of that , I bet you're glad that you did . ROFLMBO . ( my emoticons are missing )
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Old 08-25-2010, 02:24 PM
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This was a huge problem with hard linkage back in the day. Engine moves, binds linkage, driver looses control.
You should consider changing it over to a cable if you dont find a broken mount or something.
The cable is a much better setup and not as susceptible to engine movement.
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Old 08-25-2010, 04:01 PM
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I'll ck that engine mount. I do plan on switching to a cable...... attached to the LS1 I plan on swapping in. My buds have been busting my b@lls all day about the Toyota recall and how I should sue........ lol
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Old 08-25-2010, 05:23 PM
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Motor mount is new and holding, pulled hard on the linkage and the engine idled down no sweat, touched the cam/linkage and the engine went to 1000 rpm. twisted the cam and it idled down, slight pull on hard linkage ..... 1000 rpm. not real sure on what to do, never adj a weber before
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