RPMs eratically dropping
Evolving Member
Joined: Jan 2007
Posts: 198
Likes: 2
From: UK
Open up Evoscan, select actuators and depending on version you are using either select SAS mode on early versions or Speed Adj, Screw mode on later versions.
Once the actuator is engaged the idle will either raise or fall, with what you describe would imagine the car will probably stall or come close to it. Turn the BISS screw until you achieve an idle of around 850 rpm with the actuator engaged. Once you have done this release the actuator, switch off ignition and reset the battery.
Once the actuator is engaged the idle will either raise or fall, with what you describe would imagine the car will probably stall or come close to it. Turn the BISS screw until you achieve an idle of around 850 rpm with the actuator engaged. Once you have done this release the actuator, switch off ignition and reset the battery.
So should I try messing with the screw a bit more? Because when i start bringing it up i hear more and more start to escape and make hissing sound get louder. Im not sure if im bringing it up too high or not. If it helps any, the old IAC valve broke on the previous owner so he decided to go cheap and just put the screw all the way in and it was idling at 1,500. Not sure if this could of led to further issues.
I've been having a similar problem with RPMs dropping low enough that the engine dies. It only happens right after I start the car. Once the engine is warmed up a little I have no idle problems.
weird.. my 99 mits gsx would do that sometimes, never figured it out.
but my evo actually idles high when i come out of gear..but only to 1500 or so.
then it comes down in 1 or 2 seconds. but i got cams and a DSG tune.
i hope you figure it out.
but my evo actually idles high when i come out of gear..but only to 1500 or so.
then it comes down in 1 or 2 seconds. but i got cams and a DSG tune.
i hope you figure it out.
Thread Starter
Newbie
Joined: Sep 2010
Posts: 20
Likes: 0
From: Chicopee
I have greddy RS blow off valve. so yes. Zeus I think the answer to your question is no because that just completely takes away from the IAC sensor working and will cause your car to idle iratically to around 2k+ RPM's. This is what happened to me after i installed my new sensor.
Evolving Member
Joined: Jan 2011
Posts: 123
Likes: 0
From: Hyde Park, NY
I have greddy RS blow off valve. so yes. Zeus I think the answer to your question is no because that just completely takes away from the IAC sensor working and will cause your car to idle iratically to around 2k+ RPM's. This is what happened to me after i installed my new sensor.
I have the same problem with no CEL. Take a look at the video:
http://www.youtube.com/watch?v=Bfc_Mbbq_uM
After replacing IACV problem did not disappear. How should it behave with screw all the way in, because mine idles at 820-880.
http://www.youtube.com/watch?v=Bfc_Mbbq_uM
After replacing IACV problem did not disappear. How should it behave with screw all the way in, because mine idles at 820-880.
Evolving Member
Joined: Jan 2011
Posts: 123
Likes: 0
From: Hyde Park, NY
Same problem with my evo when dealing with tight traffic or just creeping forward, seems to only happen when the rps's fall from approx the 2k range. Will stall once in a while but the issue itself happens irregularly.