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Old 06-21-2010, 01:33 AM   #1
KyleownsaGSX
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BISS screw adjustment problem?

So yesterday I started my car for the first time in about 4 months. I did the timing belt, installed a FMIC, installed a new MAF and ISC, and replaced the old beat up BISS. So when I started my car up, the MAF was making a very weird beeping noise almost as if an alarm was going off and I am not sure what in the world that is. Also just to try it, I started turning in the BISS to set the correct idle. Now I know that you must ground the TPS and the ISC, but when I turned the BISS the idle dropped as if those sensors were grounded.

So my questions are what could that beeping noise be from my MAF? And also with the BISS being able to be adjusted does it mean that my TPS or my ISC are malfunctioning or possible not function at all?
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Old 06-21-2010, 01:35 AM   #2
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Re: BISS screw adjustment problem?

o By the way the car is a 91 Eclipse GSX with a k&n filter and a turbo back exhaust, those are the only mods on the car.
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Old 06-21-2010, 08:55 AM   #3
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Re: BISS screw adjustment problem?

Not at all, you can turn your BISS screw and change your idle. Its not correct for your computer, but it will change the amount of air with closed throttle and thus changing your idle speed. Your computer cannot correctly compensate because it is not done the correct way, but thats why it did change. Never heard of a beeping sound from a MAF. Is it a mitsubishi OEM one, or a rebuilt aftermarket?
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Old 06-21-2010, 03:54 PM   #4
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Re: BISS screw adjustment problem?

It is a mitsubishi oem Maf and it is brand new, if i ground the TPS and the ISC and then adjust the BISS will the computer fully adjust the idle then?
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Old 06-22-2010, 08:22 AM   #5
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Re: BISS screw adjustment problem?

I dont know, I have only heard that you have to have the mitsubishi tool to do it. To plug into the computer obd port. But I am not 100% sure of that.
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