Idle Surges - Options to Eliminate it

[98DiamondStar]

So i've been noticing since I got my car back from the transmission shop that the idle will begin to surge once it has warmed up. it will pulse from 1100-800. I have a small coolant leak that I have tracked down, and hoses will be here either today or tomorrow. But I have been reading it could be a failing ICS caused by incorrectly adjusting a BISS screw. So im going to do a test on that, to see if it is the ICS. One other way I've read people have gotton rid of an idle pulse, or surge, was to do the EGR blockoff plate. Just wanted some second opinions on what you guys think about the EGR plate, Pro's / Con's. My goals for this car is to build it to 500whp DD. ( not concerned about fuel milage, but i do want to be able to drive it long distances ).

 

[16vdohcturboawd]

This may help.

idlesurge [ECMTuning - wiki]

I have my egr blocked off with a cheap ebay blockoff plate and rtv silicone and its fine. The big issue is just making sure there isnt a boost leak at the egr because that could be causing your problem.

 

[nocardick]

I disconnected my EGR,but I haven't installed the block off plate yet,and I've had no problems whatsoever.My car also has the same idle surge that you are talking about and I'm pretty sure it's the ISC,which I've also heard can mess up your ecu if it goes unfixed for a while.Though mines been doing this for a while and my car still runs fine..Check the VFAQ because I know there is instruction on how to properly set the BISS on there too

 

[92AWDHX40]

Lots of threads on idle surge out there i just typed it in.

 

[patton98]

check for boost leak....or maybe cracked vac. line