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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

https://www.youtube.com/playlist?list=PLAFYVCyenqcrqC1WhVE1LTzQSn4mbMjdu

Related videos
– How to test an idle air control valve (IAC) using a Picoscope – Ford

– P0506 IAC System RPM below expected (vacuum leak) – Ford

– Ford idle air control valve (IAC) test – stalling problems

– P0507 Idle Control System (RPM Too High) – vacuum leak – GM

– Honda-Acura Surging Idle Speed (case study)

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.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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