BAC question
07-12-2002, 11:06 AM
#1
Senior Member
Thread Starter
Join Date: Nov 2001
Location: South Jersey
Posts: 888
My old BAC was shot so I went to the junkyard and got a new one. All of a sudden my shift up light starts working, but my car starts bucking at light throttle. SO, the question is are the BAC and shift up light connected somehow, and whats up with the bucking?
07-12-2002, 07:33 PM
#5
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Join Date: Oct 2001
Location: Portland, OR
Posts: 790
I don't think the BAC is even active unless it's cold... It's like a CHOKE to give the motor more air.
I don't have mine hooked up and it runs fine. I initially had removed it all together but added it for idle control.
I don't have mine hooked up and it runs fine. I initially had removed it all together but added it for idle control.
07-13-2002, 07:07 AM
#6
Junior Member
Join Date: Jul 2002
Posts: 7
The BAC plays a role in hot start...opens up to provide more air. It's primary function is to control the idle speed when you add a load to the engine (especially the A/C). I know for a fact that it is responsible for maintaining idle when the A/C is switched on....not positive if it compensates for head lights and other electrical loads. As for the bucking....I'd start by checking out the TPS. My car has some light surging at VERY light throttle....not sure what's causing it.
Todd
PS....The BAC does NOT act as a "choke".
Todd
PS....The BAC does NOT act as a "choke".
07-13-2002, 02:09 PM
#8
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Thread Starter
Join Date: Nov 2001
Location: South Jersey
Posts: 888
When I unplug it my car idles fine. Somethings wierd though, because sometimes my car bucks, sometimes not. Sometimes the shiftup light works, sometimes not. and once ina while it will just die, when the ac is on. I say get a new one. As for the shift up light, i guess it doesn't really matter.
07-14-2002, 07:52 AM
#9
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Join Date: Jul 2002
Posts: 7
I had a problem with my car idling poorly when the A/C was on. It turned out that the transistor that controls the BAC had burned out. It's inside the ECU but it was easy to replace and only cost me like $5.00 total. My car ALWAYS idled poorly with the A/C on (stalled occasionally). Now it idles perfectly with the A/C on or off.
Todd
Todd
07-14-2002, 08:37 AM
#10
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Join Date: Mar 2002
Location: forest city,n.c.
Posts: 441
that sounds like us too. ac kills idle, does not idle anyway and idle screw is all way in. same way with last2 engines. all new vacuum lines and seals. when it gets hot it will barely idle maybe 600rpm`s. 