Pinto Car Club of America

I have finally begun doing some stuff to Sabrina and have run across a little problem.  The idle is rough and the engine is shaking pretty good.   I have troubleshot it to a vacuum line being disconnected.  This is the line from the intake manifold from the front side.  If I plug it with my thumb the engine runs smooth with no engine shake.  I have consulted my Chiltons and Clymers but cannot find the information.  I have looked all around the carb and nothing seems to be missing a hose, however it was starting to get dark.  It is connected to detail number 6 on page 147 in the Clymers at least from what I can tell.  It is a 2.3 with the Holley carb.

One thing I did fix that perplexes me is how can changing the parking lamps all of a sudden makes the seat belt warning light work right.  Buzzer was working as advertised but the light would not extinguish, until I swapped the aforementioned parking lamps. 

Don't feel too bad.. Mine is the same way, and the whole emissions system is hackewd up. I got capped vacuum lines all over the engine compartment, and the car still runs rough... no power either, but that might be because I got severe blowby, and probably need a new engine.

To get back on track, what you might want to do until you find where it goes is go ahead and put a screw or plug of some sort in that vacuum line. It will only be temporary and will get the car running good until you find where the line goes.

Good luck with your car.

I don't have a vacuum diagram handy, but since it is a full manifold vacuum source, my first inclination would be it leads to the temperature sensor in the air filter housing.  This sensor should have two hose connections.  The other hose connection goes to the intake air temperature door vacuum motor.

You da man Straw!  Sure enough the air filter temp sensor only had one hose going to it.  Connected up the other and it's good to go.  Thanks.