hey guys, whenever i have my foot on the brake at a stop light or whatever, my idle is a little low (around 730rpm) - when i take my foot off the brake, it comes back up to aprx 750. can i raise my idle that little ammount by using the screw adjustment right after the intake elbow, on top of the throttle body (i think thats hwere it is.. im going by memory.) ----- is there anyway to solve this issue, since my idles drop when i put a load on the electrical system (brake, window wipers, etc etc)???

 

Got any vacuum leaks?

 

Bac

 

Check & clean your BAC valve & it's contacts.

 

Yah sounds like the BAC. When you press your foot on the brake the brake lights come on, obviously, and this causes a small power draw. The BAC is there to compensate for the power draws and bump the idle back up, but if it's not functioning or needs to be cleaned it wont do anything.

 

You did say 730 rpm, right? And you're worried about 20 rpm? FWIW, the idle range per the FSM is +/- 25 rpm...730 might not even be low enough to get the ECU to even worry about energizing the BAC...

I wouldn't go tearing into the BAC yet, UNLESS- While you have your foot on the brake (brake lights suck down a whopping 125 watts, BTW), turn on some other loads. Does the idle continue to fall with each new load? If not, the BAC is probably working fine. If extra loads DO make it fall further, THEN tear into the BAC

 

i allready cleaned it.. it was REALLY clean inside to start, but i cleaned it more with brake cleaner or intake cleaner i cant remember, whatever was recomended here on the forums....

im SURE its not that, unless the BACV is mechanically fucked.

there are no vacume leaks i am sure.

 

i wouldn't say the idle continues to drop with increased load.. its just.. whenevr a load is generated..

like.. brake pedal down - drops 200 rpm.. stays their.. then i turn on wipers, drops to like.. 590 - 600 and up to 7300 again, then the whiper engages again, and it does the same thing... and so on and so forth...

my stereo doesn't seem to effect it.. but i only have 2 stock speakers int he back and a basic cd player

 

Sounds to me like the BAC is just not functioning all that well from the description you gave of other loads you put on the engine.

 

like.. should the BACV bring the idle back to normal after a load, or KEEP it at the same, steady idle ALL the time, regardless of the load put on it...

in other words, with the BACV functioning, should to see a drop in RPM with electrical load?

 

The BAC's function is to bring the idle back to the "normal" range of 750 +/- 25rpm under electrical load. If when you put load on the car using accessories it falls and does NOT come back up during that load, it would be my guess that the BAC isn't doing anything.

Try this to see if the BAC is working. Undo the connector and hook power and ground straight from the battery up to the BAC and see if the idle raises, if it doesn't your BAC isn't working.

 

ok.. did that, the BAC is WORKING

hrmm.. what next?