I see you are on-line.

I've read many many threads to try to solve my SE problem. Just wanted to get your input.

My 84 SE idles low (500 rpm). I've adjusted the air screw all the way open (counterclockwise) and set the variable resister all the way rich (clockwise) just to get the idle that high. Timing is set dead on. I don't think it's a vacuum leak, because most thread seem to discuss high idle related to leaks.

Is this a BAC valve problem?

 

It sounds like maybe a BAC problem. The BAC and related solenoids are suppose to try to maintain a constant 800 rpm idle. Also make sure the TPS is adjusted correctly. For the BAC, you can take it off and get to see of the internal plunger moves easily. Sometimes carbon can keep them from working. There are some tests in the FSM (Factory Service Manual) to check the solenoids that control the BAC. The FSM is available online. There is a link for it in the 1st gen FAQ. Also there is an article on here on GSL-SE idle problems that can give somethings to check. I will see if I can find it for you.

Now is this after the car is warm? Is the idle higher when cold? You should press the accelerator once fully before starting. This locks the throttle plates in a bit higher position to increase idle. Once the engine is warm, the cam is released, returning the idle to normal (800 RPM). Hope this helps a bit. I will dig you that article for you. We can go from there.

Kent

 

Thanks for the reply.

It warms up normally. Idle is higher until cam is released.
I do start it the proper way.
I've got the FSM, David Lane's article etc.
All ignition is good. Runs good at higher revs.
TPS has been adjusted correctly.
From what I've read, BAC seems most likely culprit. I just wanted your opinion before I pull it to clean/inspect. Any other possible low idle causes?