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Thread: S14 zenki idling problems

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2016-04-17 00:36:22
S14 zenki idling problems
I have a s14 zenki, old engine has spun bottom end so i bought another black to sr20det and put it in. First i had a really bad rattling sound so i changed the timing chain tensioner and that rattle sound was gone but now i have another rattling sound and don't know what it is and it isn't VCT. Also when i bought the car have the wires where copped, it had a haltech e8 ecu running still have the ecu but just put in a stock one for now so i know the car is running fine but when i replaced the haltech with the stock ecu the idling on the car has just gone wacko, it will idle between 900RPM-2000RPM and not sure if this is due to my IACV wires being chopped or something else, please tell me what you guys recommend for me to do

2016-04-21 11:40:42
The purple plug goes to the Fast Idle Control Valve (FICV), which is basically just an ON/OFF valve. It supplies extra air during power steering input, to raise the rpm's of the engine so it doesn't stall. It is not necessary for a smooth running idle.

The brown plug goes to the Idle Air Control Valve (IACV), which is a PWM 0-100% valve. It supplies a fine amount of air to regulate the idle speed, depending ona multiitude of other parameters (engine temp, speed, rpm target etc.). It is VERY required to have a smooth running idle.

If I were you, I would fix the brown plug first.
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