Ford Idle Air Control (IAC) valve test (how to adjust minimum idle speed)
Here, we’re covering an idle speed issue on a Grand Marquis. This video goes along well with chapter 20 in my book “Idle Speed Controls”, but also specifically covers Ford scan data and minimum idle speed adjustment. The testing methods shown will apply to most Ford systems that utilize a two wire IAC valve, as well as other 2 wire IAC valves used by other manufacturers.
Engine Performance Diagnostics chapter 20
Symptoms
high idle speed
check engine light (P0507)
Fix
adjusting minimum idle speed
Tests shown
understanding the meaning of a P1000 code and how to inform the customer about it
using scan data to diagnose an idle issue
how to identify a misadjusted base idle screw using TPS signal
how to adjust minimum idle speed on a Ford
how to use IAC duty cycle to determine what the computer is trying to do with the idle speed
Tools used
scan tool
Playlist
(Chapter 20) Idle Speed Problems and Testing
• (Chapter 20) Idle Speed Problems and Testing
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Disclaimer:
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