Setting Idle Question

[travislaw]

This afternoon I am going to be putting in a throttle that I rebuilt. I had a spare one that I replaced the O-rings on because my current one is leaking. This spare throttle has never been on my car, so I wanted to know in what order I should change things in getting my idle set to where it is supposed to be. There is the throttle screw, the BISS screw, and the TPS sensor that will need to be adjusted. Which one do I set first and what should I be looking for as I get the idle back to where it is supposed to be?

 

[somdturbo]

I would set the TPS to the same way it was on your old throttle body. Then for the idle, turn your car off, screw in your BISS (base idle set screw) completely in, then 180* outward. good luck!

 

[pnishr]

First off, you're gonna need a multi-meter (volt-meter) to set your TPS CORRECTLY, it can't just be that it looks like the other one. Read this:

http://www.plymouthlaser.com/tps.htm

That's from VFAQ: www.vfaq.com

You can find A method of adjusting the BISS on VFAQ too, but it's different than mine listed below (slightly) because I have DSMLink

Then it doesn't really matter where your BISS is when you start the car, you're probably going to be able to tell if it's too far in. Your car is going to need to be at operating temps to even adjust it anway. otherwise you could be in high-idle mode and f-ing it up.

Third, you really need a datalogger of somekind to do the whole set up properly. The idea is to get your learned idle adjustment # to 140, and your ISC position to 30, that way you're not killing your ISC from it having to over-compensate. Your car will do a decent job of "finding" and "adjusting" your idle to the preset parameters, but you're gonna wear out your ISC, and have less than optimal running conditions with this whole "slap it together like your old one and then use this magical preset BISS adjustment" mentality. There's way more to it than that.

So, to recap:

1: TPS
2: BISS

Don't even worry about the "throttle screw" as long it's not holding the plate open at 0% throttle. Mine doesn't even touch. You could use it to help set idle, but it's not the way i would/do it. because at that point, you might as well have the BISS all the way in and just use that. it'd still accomplish the task of getting air in past the TB plate at 0% throttle. use the BISS.