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could a clogged cat make my secondaries not open much?

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Old Mar 24, 2002 | 07:24 PM
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MattW's Avatar
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
could a clogged cat make my secondaries not open much?

could a clogged cat make my secondaries not open much?

cuz my secondaries barely open and i have the a/v tension right so its not that.......and when i floor it i hear a clicking noise and a rushing air kind of noise........
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Old Mar 24, 2002 | 11:58 PM
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From: Plain City Ohio
i really don't think that a clogged up cat would do that. do you have the stock q-jet or not.... because if you do the secondaries don't really open very wide ever. the sucking noise is just the carb getting air its normal. what i did is got a non-computer controled carb, new distributor and got rid of that q-jet and im happy with that. it is costly but worth every dime.
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Old Mar 25, 2002 | 12:56 AM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
its the stock carb Q-jet

there is definately something wrong cuz my car will do nothing but bog past 1/2 throttle or so....its horrible

and the secondaries DO open bigger than they are now cuz i remember when i was adjusting the A/V tension they would open pretty far......and i probably WILL do that swap....but that will b when i get a new motor for it....its not really worth it on this motor
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Old Mar 25, 2002 | 01:32 AM
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rx7speed's Avatar
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From: Caldwell,ID
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating
if you have any vac secondary carb and then put a restriction in the exhaust (like your clogged cat) you will have them open slower and prolly not as much
the problem is the backpressure from the clog in the cat will prevent that spent mixture from getting out of the cyl so since you have less volume in the cyl to pull in a fresh intake charge you are not going to pull as much vac therefore slowing down your opening of the second plates in the carb

or so I am thinking
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Old Mar 25, 2002 | 10:54 AM
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
well they are mechanical secondaries.....but wouldnt they still work on some kind of vacuum?


cuz i was kinda thinking the same way u were RX7speed
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