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

[jimkelly]

On my 1976 2.0L I changed my bad 043 mps to a good 049 mps. While things appeared at first to
me much better - and are in fact much better - because back firing is esssentially
gone - I have noticed this problem. Maybe I did not notice it immediately because
my drive to work is extremely short - 5 miles. I have taken two bit longer trips recently
and found that after letting my car warm up in the garage for 5-10 minutes - for the first 10-15 minutes of my drive everything seems fine - I can rpm up too 4000 smoothly but after another 10 minutes or so it starts to hesitate at 3000-3500 rpms. If I come to a complete stop _ red light or stop sign - a few minutes later - coming off the light I find that the hestiation starts even earlier that 3000 rpm. I have one problem that I know of - my FI plug to one of my fule injectors is lose-ish ut tis does not appear to have been my problem causing this hestitation problem. Any idea if this could be being caused by a bad head temp sensor or position switch? Note problem does not occur withing first few minutes of driving but does become apprent after 10 or so minutes of driving and them worsens.

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