No more clicking noise when I turn off car.

[Phantom]

My car use to make a few clicking noise when I turned the car off. From what I understand, it's suppose to do this because of the Idle Speed Control Valve.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=106

I've been getting a few codes recently (12, 14, 71) and my car is running a little rich and the idling sometimes fluctuates when I start it for the first time each day and after about half a minute it'll idle consistent.

While browsing the TSRM, I've noticed the ISC Valve section and after listening for the clicking noise on my car, I realized it no longer makes the noise.

Is there anyway to fix or clean the ISC Valve or do I have to buy another one? Could this be the reason why my car is idling so inconsistent?

 

[hvyman]

12 RPM Signal


Diagnosis

* No "NE" or "G" signal to ECU within 2 seconds after engine has been cranked.

Trouble Area

* Distributor, or CPS, circuit
* Distributor or CPS
* Starter signal circuit
* ECU

14 Ignition Signal


Diagnosis

* No "IGF" signal to ECU "A" times in succession.
A = 6-8 (7M-GE)
A= 3 (7M-GTE)

Trouble Area

* Igniter and ignition coil circuit
* Igniter and ignition coil
* ECU

71 EGR System Malfunction


Diagnosis

* EGR gas temp below predetermined level during EGR operation.
* Open circuit in EGR gas temp sensor signal (THG).

Trouble Area

* EGR system (EGR valve, EGR hose etc.)
* EGR gas temp sensor circuit
* EGR gas temp sensor
* VSV for EGR circuit
* VSV for EGR
* ECU


you can take the isc apart and clean it out and that might solve that problem but it looks like you have other problems as well.

 

[89Joe]

The ISC could be one reason. Especially if there is a vacuum leak to the unit.

 

[Phantom]

Thanks for the input everyone.

hvyman, I really appreciate the very organized response.

I have a used ignition coil/igniter unit that might resolve the Code 14.

How would I clean the ISC?