Quote:
Originally Posted by Speedy Squirrel
They solenoids are supposed to be connected to each other as shown below. They share the same ground and control input
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Yep. The diagram I have shows terminal #7 on the enrichment control unit, for a 1986 model (mine's 1987), vs #12 on your diagram. Different years?
Now twist your brain around my logic:
Either way, no power getting to them. When bench tested, the solenoids open up with 12vdc. According to the shop manual for 1978 and beyond, they're closed when cold (i.e., no power) at initial startup...which would prevent the vacuum signal going to the retard port on the dizzy and give you 15° of advance for high idle. Then supposedly 15-20 seconds later they magically get 12vdc, open up, and vacuum retard kicks back in to 1° ATDC. I could investigate the enrichment control unit (something to do with the Lambda I guess but not sure it's function). Perhaps...perhaps, because I have my O2 sensor unplugged and running open loop its freaking out the unit and not delivering power to the solenoids.
So in the absence of idle vacuum retard due to an inactive/closed solenoid, timing should advance to 15° BTDC...vs the spec of 1°ATDC with hose connected...just as if you were to pull the hose off the dizzy you would see 15° BTDC.
Bottom line, I tune to 12-15° BTDC at idle and runs perfect. May freak some people out "that's too much timing"!! but that advance would happen anyway once you open the throttle and the vacuum port in the TB loses its vacuum. We don't really need that dual port dizzy vacuum can in my mind, just emissions crap to for retard when idling along to keep your cat hot.
My view on things, could be wrong, always open to learned wisdom from others.