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

In this video I will show you how to use Idle Air Control (IAC) position to identify a vacuum leak. It is important to understand that speed density engines (MAP engine with no MAF sensor) can have normal fuel trim numbers with a vacuum leak. This is why understanding how to read and interpret idle air control position on a scan tool it critical. The type of IAC used on this car is called a stepper motor and it's position is displayed on the scan tool in steps or counts. A "0" count means the IAC valve is fully closed. Engine Performance Diagnostics chapter 20 Symptoms - check engine light (P0300, P0171, P0507) - high idle speed - poor gas mileage Fix - replace power brake booster (leaking vacuum) Tests shown - how to interpret IAC motor position on the scan tool - how to locate a vacuum leak - why it is important to remember the one way check valve in the power brake booster - how to locate a leaking power brake booster - why fuel trim numbers look normal with a vacuum leak Tools used - scan tool - smoke machine Playlist - (Chapter 20) Idle Speed Problems and Testing /playlist/PLAFYVCyenqcrqC1WhVE1LTzQSn4mbMjdu Related videos - Vacuum leak testing without a smoke machine (an SD Premium video) /watch/oPBqn-aBQFRBq - Ford F-150 P0171 P0174 Trouble Codes - vacuum leak (water test) /watch/cCUYbh2no-KnY - How to find a vacuum leak with water /watch/4QSFz-8doucdF - P0506 IAC System RPM below expected (vacuum leak) - Ford /watch/QNTa3zlepqSea - Causes of lean condition trouble codes P0171, P0174 - GM 5 3L /watch/Mt6w22STFR3Tw 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 https://www.scannerdanner.com/join-scannerdanner-premium.html 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! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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