I have a 99 GSR turbo and the idle is surging recently. It has been doing it since i boosted the car about 5 weeks ago, but lately it has gotten worse. The car is running on a street tuned basemap (not bad, but not great). I was wondering if the idle surge was something that i can change once the car is tuned on July 10, or if it is something mechanical that i have to change. I have a new Tial BOV to replace my RFL because i think that might be part of the problem....and with my setup i get mild compressor surge.

What can i do except deal w/ it? Also, my car idles at 1500 in closed loop and right around 2100 during open loop.

 

The symptoms that you are describing sound very much like a small vacuum leak somewhere in the system. Does the boost pressure come up smoothly? Do you get boost spikes?

 

is it surging or is it high

 

it is boosting smoothly and doesn't spike at all...

it is running at 2100 during warm up...then at operating temp it is at 1500. Then it surges from 2000 to 1000 and back. I watched my boost gauge and the vaccuum is steady at 21psi but once it surges it pulls from 21 to 17 and then back.

 

under your throttle body is the fast idle air control valve...unbolt your throttle body and then take off the cover on the bottom peice of the throttle boddy (there is a thread on how to do this)...then you screw the plastic thing all the way down and it should work...if it doesnt u need a new iacv(or just clean it)

 

its the FITV. Take it off the T-body and tighten up the white screw and it will fix it I gauruntee it.

 

kick *** guys....i'm going to do that on Monday when i get back from Lake Winnipeg. Thanks for the help...i'll let you know how it goes.

 

what about if you dont have a FITV ive tried everything from tuning to cleaning mine surges like no other. im down to swaping to a 2 wire

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dornon13 &raquo;</TD></TR><TR><TD CLASS="quote">what about if you dont have a FITV ive tried everything from tuning to cleaning mine surges like no other. im down to swaping to a 2 wire</TD></TR></TABLE>

same. ive sprayed for vacuum leaks and found nothing...

it even surges when i bring it up to like 3000 rpm.. 2800 3000 2800 3000

i just gave up on it and deal with it.

 

same issue here on an ls motor going to go do this FITV thing see what the deal is

 

guranteed fix I AGREEEE

 

Unplug the purge control solenoid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nowtype &raquo;</TD></TR><TR><TD CLASS="quote">Unplug the purge control solenoid.</TD></TR></TABLE>

the expletive is that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shortyz21 &raquo;</TD></TR><TR><TD CLASS="quote">the expletive is that</TD></TR></TABLE>
emmissions shiat

 

is the other plug that runs aside with the map sensor plug...i believe....

 

found it and fixed it......the problem: a vaccuum leak on an injector O-ring....thanks for the help guys!!