Hi Guys,
I'm new in this forum and seeking advise from all the expert here regrading my issue. I owned an evo 7.5 gta and lately getting a very strange problem which is the RPM drop tremendously to 500 and bounce back to normal. The event happened when i'm pushed and released the gas at 2500-2800 rpm while i'm driving especially when stopping and moving between speed bump and up hill. The issue happened right after replaced the faulty OS2 sensor. No fault code, no error was detected by using the Autoland Scan device. Tried turn off BOV, replaced throttle body, MAF sensor and even install the HKS EiDS (Electronic Idle Stabilizer) is doesn't help at all result are the same. Any idea? What the possible cause of this issue?

Spec as the following:
Stock ECU
Evo8 downpipe
HKS Fliter
HKS BOV
Greddy Boost Controller
Apexi Timer and Boost Meeter
Pivot Speed Limiter
RallyArt Exhaust

 

Maybe the idle stabilizer isnt connected properly. that sounds like the issue. I dont have my bov rerouted either and my car does the same thing, ESP if you disconnect the battery, The car seems to adjust itself to the bov.
When i reset my ecu and drive, the car will fall on its face so hard that it will stall out. it really hates the bov. Cant wait to put aem on it and get rid of dumb **** like that.

 

Is the BOV recirculated?
Has the ISC Motor been checked?

 

Hi SpoolinUP,
I'm using not circulated type BOV and tried two different sets of throttle body therefore possibility of ISC faulty is minimized.

 

Recirc your BOV.

 

im running an hks no re-circ and have no issues, however my friend did not re-circ his forge and his car did not like it, its worth a shot, sometimes they like it and sometimes they dont

 

check your cam sensor and crank sensor. i remember seeing these symptoms on a thread before.

 

Hi Guys,
Thanks for all the good feedback and advise. Test with the recirc BOV and problem solved.