Hello all,
I have searched the archives and don't readily find an answer to my question. My '79 daily driver is getting back on the road again after getting new gas tank straps made. It has a few issues I am tracing down, mostly a ping on light acceleration. I will get back to that.
In checking timing with my 40 year old timing light I timed my Pinto's with back in the day (such a blast!), I am supposed to be 20 with vacuum advance disconnected and plugged. I am at 18, not much off, but wanted to zero it in. So, looking down at the bolt to loosen the distributor, you can't see it due to a hose about 1 inch in diameter, running under the intake manifold, making a 90 degree turn up, then ending. In the end of this hose is a plastic piece with 2 vacuum barbs, one hose running to the base of the carb, a smaller hose running into the left fender well. Anyhow, this part is broken, has a spring and a plunger. My question is what is this part? With the part removed and the vacuum lines plugged, I am curious about that 1 inch hose that this thing plugged into is for. What is it? With the engine idling, there is no vacuum, nor air coming out of it. I taped it off, and as I said plugged the other 2 lines. The car runs a lot better, I think I had a vacuum leak with this part broken.
Another question, how to get rid of the ping on light throttle? Set it to say 14, going closer to TDC? I noticed I had no vacuum sucking from the vacuum advance line at idle. I recall from my '71 and '74, from back in the day, you had live vacuum on that line. I am sure with all the smog and emissions crap that is on this thing, things have changed.
Any ideas would be appreciated.
Dave