1976 2.0 question, throttle body Options

[jimkelly]

Up untill a few days ago my car was running fine but all of a sudden it started to back fire when I decelerated and starting it became difficult. One thing that has been found is the both the vaccum hoses - light blue and the red to the distributor - both pull vaccum at idle and both lose vaccum when giving the motor some throttle. The red is supposed to have little vaccum at idle and gain vaccum with added throttle - correct? We are thinking that my throttle body has gummed up hole some where but at this moment we don't know how the advance hose nipple is plumbed in the 1976 2.0 throttle body - anyone got any ideas or a detailed drawing of how the advance vaccum flows through it? Thanks, Jim

[motorhead]

this is interesting! I've had the advance side of my 76 hooked up to the TB forever. Mine is a CA car with EGR, so it has the same ports as the 73 above. Vacuum at mid throttle for the EGR. Guess I just assumed it needed to be hooked up to the dizzy too. This explains why I have to run a tee in the line to hook up the EGR when I smog it. Think I'll go mess with it a bit and see if it improves light-throttle driveability.

Also my $.02 on your backfire on decel. Thanks to Headrage, I eliminated 95% of my pop on decel by leaning out the CO adjustment on the brainbox. I have always kept it about 3/4 rich just to be on the safe side. Don't wanna burn a piston. Allan was following me one day and clued me in to the rich condition causing the backfire. Couple of test drives and adjustments and viola! no more backfire. thanks again Allan. (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif)