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#1
05-12-2003, 03:20 PM
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Please forgive me but I don't know too much about carbs and vacuum hoses... but i have a '76 TA 400 4bbl 4spd and it appears that i cannot get the secondaries to open up at all. On the road, once i start to get on the gas, the engine starts to sputter. it was working fine a short time ago but a friend moved the vac hoses and now I just can't figure it out. Any help would be greatly appreciated!!!
carl
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carl |
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#2
05-12-2003, 03:20 PM
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Please forgive me but I don't know too much about carbs and vacuum hoses... but i have a '76 TA 400 4bbl 4spd and it appears that i cannot get the secondaries to open up at all. On the road, once i start to get on the gas, the engine starts to sputter. it was working fine a short time ago but a friend moved the vac hoses and now I just can't figure it out. Any help would be greatly appreciated!!!
carl
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carl |
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#3
05-18-2003, 05:28 PM
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check to see if the top secondary air flaps can be pushed in with your finger.
years ago i had a q-jet that acted the same way. the culprit was a casting flash on the upper-inner rear portion of the secondary openings. this caused the top air flap to hang-up which in turn would not let them open under the engine vacuum once the lower secondary throttle blades opened. check first to see if this is the problem. if so, take the carb apart and use a small file and remove the casting flash as required. 1973 SD455 T/A 1979 S.E. T/A http://community.webshots.com/album/16587603rOyvmFCiHs
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Home of WFO Hyperformance Shaker induction. |
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#4
05-18-2003, 06:51 PM
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Adding to Larry's comment: check the choke and lockout mechanism to ascertain both are functioning properly. Note that if the choke plate does not obtain a vertical position the lockout prevents the airvalve from opening.
Jon. Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#5
05-19-2003, 05:25 AM
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will do guys, thanks for the help! i'll post back with any results.
carl
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carl |
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#6
05-21-2003, 08:31 AM
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Listen to Jon, he just helped me solve a similar issue with my 75 ta. Turned out, the choke was set incorrectly!
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#7
05-21-2003, 09:50 AM
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you know what guys?! from me fiddling around with the choke, i think i made it worse. now when the engine warms up the choke flap falls open and the rpm's go up to 'bout 2 grand (oops)
 . what's the proper procedure for properly adjusting a choke thats out of whack?carl
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carl |
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#8
05-22-2003, 01:40 PM
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Advice offered to me by carbking on another forum:
Remove the air cleaner, and with the engine turned off; move the throttle linkage and the choke linkage and see what happens. The choke plate is connected to a 'secondary airvalve lockout' (this is a rocker assembly that prevents the secondary airvalve from opening). Move the choke plate such that the plate is vertical. Observe that the rocker assembly is pushed away from the airvalve and the airvalve will open. Observe that if the choke is not vertical, the airvalve will not open. If the choke is set too rich, more heat would need to be applied to the choke to cause the plate to obtain the vertical position. The proper adjustment of the choke is that the choke mechanism should cause the choke plate to just touch closed at 68 degrees F. Assuming the spring has not been damaged by overtightening, this setting should allow the choke plate to obtain the vertical position, and allow the secondary airvalve to operate when the engine is warm. Hope this helps you as much as it helped me! Thanks again, Jon! |
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#9
05-22-2003, 06:18 PM
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Slow 75 TA - you are welcome, glad to help.
Jon. Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air". "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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