RPM go up and down very fast..... i tried everything... i just don't know what to do........ My S2k is turbocharged... and i even disconnect the EMS and connect the stock ECU ... and it's still continue... maybe some kind of sensor .. the problem that i have to go to the Honda main garage because i can't put jumper and see the blinks on the mil (check engine light) .
Somebody know how can i see the mil blinks without PGM tester or OBD2 scan tool?
Thank you
Udi
ISRAEL

 

i've had erattic rpm problems before and it turned out to be my vacuum lines. recheck these for any leaks.

 

mine was from the iac valve

 

It's the I-ACV, because the boost!
Thank you!
Udi