Quote:
Originally Posted by mclaren1885  No their functions are different. While the DFCO cuts off fuel at no throttle conditions and injects fuel at a particular RPM (say at idle or just near to idle) after the cut-off time, the IAC valve helps is maintaining a constant idle (say 750 in case of idle and 1000 incase of idle in gear). The basic function of the IAC valve is to prevent the car from going off at no throttle position. |
Okay so the jerking in my case is not near idle or at idle. it's more higher, I dont know the rpm as theres no tacho.
So the IAC valve maintains the idle whereas the DFCO cuts the fuel at no throttle. So once you back off the gas pedal the DFCO kicks in by cutting the fuel but the IAC valve makes sure that this fuel cut off does not stall the engine and again sparks which I guess is causing the jerk?
Is that right?