idle air control question...

[xdsmlaser93x]

will the 2g isc work in a 1g throttle body? because i switched them when i put my 1g tb on my 2g and the idle would go up and down and wouldnt stop. im getting a p0505 and i know my 2g isc is good because i had no problems with it b4 i switched the tb.

 

[steve]

will the 2g isc work in a 1g throttle body?

Yes, assuming you didn't blow a driver from a short in the 1g ISC. Did you measure the coils before hooking it up?

 

[xdsmlaser93x]

no i didn't measure anything... i tried replacing the 1g with the 2g a while ago and it didn't work the idle would flair and drop flair and drop and it wouldnt stop. i put the 1g back in, the almost stalling at idle went away and i cleared the code, and it was running great for a few months and it never came back on untill this weekend when i put my magnus intake manifold on, now it idles at 1000 rpm when i first start the car but after driving for a bit it idles anywhere from 1500 to 1850ish.

 

[romeen]

Increased idle speed when the motor warms up is often due to the throttle cable being too tight. Loosen it up just a bit and see if that helps.

The idle fluctuations that you are describing could very well be the ISC motor doing it's job. If you are getting too much/not enough air past the throttle plate when it's closed then the ISC has to work harder in an attempt to maintain idle within a normal range. Of course this is stressing it out and may lead to burned out coils (in the ISC). Do some searching on idle surge for more info.

I would start with a boost leak test and fix all leaks. Test the ISC coils. Then try loosening the throttle cable a tad and see what kind of results you get.

Testing ISC (contains link to Terry's Troubleshooting Idle Surge):

DmTaLoN's Idle Speed Control Test/Fix Page!

 

[xdsmlaser93x]

good to know, thanks for the info... unfortunately that issue will have to wait because on my way home about an hour after posting my original question i popped my head gasket.... ohh boy.