Biss screw adjusting

[andytalon]

Alright, what exatctly happens when you turn the Biss screw when you dont ground the 2 things out? I think the previous owner of my car did this. I think that is what is causing my car to idle so high when im sitting somwhere after it is warmed up. Is there anyway I can reset it? I adjusted the screw the right way, I grounded the to things, and it was changingg but it was still really high. Is there anyway I can trick my car by shutting it off backing the screw all the way, then turning it on and grounding it and adjust it to be lower the idle more.

any ideas. Also, im running 450ccs, safc, and a 255 with no fpr. could that be makin my idle so high at a stop after the car is warmed? Im lost and dont know what it could be anymore.

anything would be great thanks!

 

[BISHILVR]

You dont have to ground anything when adjusting the biss screw. Just make sure the engine is fully warm or it wont have the right effect.

 

[xveganxcowboyx]

Yeah, I read my Chiltons and it talked about NEEDING to ground something and blahdy blah. After shooting sparks and nearly igniting my engine trying to figure out what I was supposed to do I gave up and just adjusted it. I've done this several times now, including taking it out to replace the seal. No problems at all. Idles perfectly.

So, summary, just turn it until it works.

 

[andytalon]

the faq specifly says to ground it. If it isnt true then the faq should be changed but I do think it serves a purpose. Also remember I have a 1g, might be dif. Anyone help?

 

[blcknspo0ln]

the faq specifly says to ground it. If it isnt true then the faq should be changed but I do think it serves a purpose. Also remember I have a 1g, might be dif. Anyone help?

VFAQ is all about doing things the RIGHT way. we all know there's a difference between doing things the right way, and doing things just to get it running again

 

[talontd92tsi]

http://www.vfaq.com/mods/BISS-1G.html

Thats the correct way to do it, i didnt do it that way at first and had a bad idle surge, doing it properly fixed the idle and surging problems.

 

[dr_fatkins]

To answer your question on why you ground... Grounding prevents the ECU from moving the ISC Motor to compensate for the changes you are making with the BISS. This is the most effective way to adjust because you can dial the idle in by using the tach and be done.

Trial and error works without grounding, it just takes longer. Because the BISS is a passive non-electrical component, there is no harm in adjusting it by the trial and error method. Hope that cleared things up a bit.

 

[ericbev]

A little info for ya. Might help ya get you pointed in the right direction.

http://www.dsm.org/how-tos/tttt/tttt3.html