blocking off faiv but what about the ISC??

[Beanokid69]

I am going to blockoff my fiav in a few days and wanted to figure some stuff out to help me decide if i should block the isc as well.

the reason i am thinking of doing both is because I already idle at about 2500 when cold, I dont really use anything in my car that puts a load on the engine. The a/c is removed, I rarely use the heater, the only thing that might effect the idle would be my fans being on constantly....I have 1 slim fan that runs constant. Anything else that I should consider that would effect my idle greatly if I blockoff the isc as well as the FAIV?

 

[turboking15]

i would also like to know about this because i plan on blocking off both and using the biss to set idle.

 

[Tsi_User]

Taken from Ray Peters-
"Sealing the FIAV is fine down to -10 deg f or so, after that the ISC passage isn't large enough and you will have to crack the throttle a touch to get it to keep running. Trust me on this removing the ISC is a crappy solution. The computer expects to be able to set idle speed during warm up and uses the ISC for many more things than just simple idle. While I will agree it is possible to make it run without it, remember back to the days when turning on your headlights changed your idle speed?? Maybe I'm getting old... but I like the engine to adjust for conditions and I can concentrate on driving, not wondering if / when the engine is going to die because the idle is too slow."

The general consensus seems to be that:
Blocking off FIAV- good
Blocking off ISC- bad

I have the FIAV blocked off on my car due to idle surge and it fixed it like a charm. Hope this info helps.

 

[nuzzlenut]

I blocked both the FIAV and ISC on mine. I do not have a/c. The only problem I have is when first starting the car before it is warmed up. It idles very low, 200-300 rpm's low. As long as you have time to wait for it to warm up it is no big deal.

 

[turboking15]

thanks. i dont have air or vacuum headlights ( silly 1g's )

and its a summer car so outside temp isnt that big of a factor.

 

[nuzzlenut]

Outside temp is still a big factor to me, I see you are in Ohio, I am going to guess we have common winter temperatures. On a 100 degree day I cannot start my car put it in gear and go, I must wait for the idle to come up or will die between my first 1-2 shift. Normally no big deal, only takes a minute or two and I just wind out my first shift as long as I can without boosting, then I am good to go. When I drive it in the winter, which is very rare, every once in a while it will stall when dropping rpm's too quickly at a stop. It doesn't bother me but just something for you to think about.

 

[luvmygst]

thanks. i dont have air or vacuum headlights ( silly 1g's )

and its a summer car so outside temp isnt that big of a factor.

Um the headlight on the 1gs are electric not vacuum operated, I think that went out with the old hide away headlight in the camaros. Think before you

 

[turboking15]

Was that supposed to say 100* or did you mean 10*?
My car will never be driven in the snow, at. i put it away for the winter and drive my beater.