Alright, most know my setup already...... built h23 turbo yada yada yada....... anyway I finally got to tune the car with the new 440's in and it ran great, got it to idle good and everything..... turned up the boost.... no problems...... this was yesterday, now today..... start the car runs fine..... drive about 20mins..... little to no boost, then one hard pass....... pull car over..... starts idleing very strange like when a vaccumm line blows off and it sounds like someone is slowly tapping the gas pedal...... anyway the vaccumm line on the ITM are fine and every other one i saw was ok too........ Any ideas???? I'm still thinking vaccumm somewhere..... or maybe fuel pump...... but thats an upgraded pump just like the rest of the car?? someone help me out!

 

my accord will do that every once in awhile with the safc hack, i can't figure it out.

 

Maybe try adjusting the idle screw on your throttle body, or maybe you have a bad idle air controll valve. also try spraying water or "soapy" water on your vacume lines to check for leaks(look for the bubbles)(lol)

 

mine did it after i reset the ecu and did a hard pull........i dunno, i have a spare IAC valve ill throw in. .

 

Idle surge? As in its consistantly cycling between say 1000-1500 RPMs? Take brake cleaner and spray it on vacuum sources or possibly leak candidates. If it fixes the idle for that moment, voila, you have the problem.

We installed an intake on a GSR and when we started it, it was surging from 1200-2000 consistantly. Turned out my buddy Dick fucked up the IAT sensor, which caused the car to do that.

 

just unplug a vaccum line from anywhere right?


it only does it sometimes, not all the time.

 

Yeah just sometimes........ could it possibly be a bad O2 sensor??? thanks for the suggestions...... keep them coming...... so far no vac leaks

 

most of the time it's the IAC

 

I just replaced the PCV valve and the car idles perfect now. 750rpm and smooth.

 

not that either...... it only does it after driving hard for a while.... i'm running rich lately for the hell of it..... maybe i killed my O2 sensor.......anyone?