high idle...boost leak??

[kidwiththelaser]

My car has been idling funny lately, sometimes it idles between 1000-1500 rpm, but one night it was idling above 2000 rpm!
I think its a boost leak because my car starts to sputter after going into boost and i can feel it getting slower, but could a boost leak really cause that big of an idle difference?
well thanks for any help guys!
-Charlie

 

[kidwiththelaser]

i should probably specify more about my car!

92 laser awd 6/4, mods are as follows:
-big 16g
-2.5" exhaust
-BSE
-No ac
-No ps

 

[sonicnofadz]

I recommend getting a boost gauge asap. This way you can see if your reaching the proper desired boost level. Reset your idle speed. Check your isc motor.

 

[kidwiththelaser]

oh yeah, sorry i have a boost guage
at normal idle it reads 18 vacuum, give or take,
and whats the isc motor?
thanks guys!

 

[ColdAudio]

I had a similar idle problem in which it would never stay at just one setting, depending on when i stopped it could be anywhere between 1k-2.5k. Fixed it by finding a vacuum leak on my UICP and fixing it, solved it and have not seen the problem since.

 

[ddavisaf]

Do a boost leak test.
ISC Idle Speed Control

 

[VBGSX]

In this order:
Boost leak check
http://www.vfaq.com/mods/ICtester.html
ISC:
http://dmtalon.v8eaters.com/ISC.html

Good luck

 

[kidwiththelaser]

thanks guys!!
i just made a boost leak tester and I will test that out soon, and i will test the ISC too!

 

[KJS1820]

Have you messed with your throttle cable lately? If you don't have enough play it the idle can change with the temperature
Later

 

[kidwiththelaser]

Have you messed with your throttle cable lately? If you don't have enough play it the idle can change with the temperature
Later

as a matter of fact, I have!
I was going to remove the cc, but then I realized that i would need a completely different throttle cable.
and I also found out that I have a major boost leak from the top of the IC, so thats going to get fixed, and if that doesn't fix it then I will buy a multi meter and test the ISC.
thanks so much guys!
-Charlie

 

[kidwiththelaser]

Well, I plyed around with the throttle cable, and i put it back through a little clip, and that fixed the idle problem.

thanks for all the help!