I am in the process of building a MS1 V3 board and have a question about using a FORD PWM Valve as a FIdle valve.
I know the manual says that NO PWM for MS1 but If I limit the flow of bypass air with a plug/orfice and use the valve as a MS1 grounded switch where switched 12V is applied to the valve and the FIdle circuit supplys the ground pulling the valve full open when I need fast idle. Why won't this work? What am I missing?
PWM Idle Air Valves
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Re: PWM Idle Air Valves
AFAIK Ford pwm type IAC valves won't work with a steady state current. It has to be a pulse width modulated signal where the width (on time) of the pulse at a particular frequency (80 to a few 100 cycles) controls how much the valve opens. There are IAC valves that work just as you describe though.