https://stream.echo6.co/videos/watch/df809970-23a9-440e-a465-0a2fbb5bbfda Intermittent no start problems from a bad computer ground. 2000 Audi S4 Quattro 2.7 Turbo. The procedures shown in this video apply to ALL make and model cars. When you understand circuit designs like the 5v reference and sensor ground paths, these types of problems are very easy to identify. The problem on this Audi was revealed within the main sensor circuits (MAP and TPS etc) and was quickly narrowed down to a sensor ground problem. Symptoms: random stalling problems, intermittent no start, clicking noises under the hood when not starting, no communication with scan tool, throttle body motor clicking rapidly, Fix: tightened loose computer ground eyelet located on the firewall, Test procedures shown: electronic throttle body tests, throttle position sensor signal tests with a scope, MAP sensor signal circuit, sensor ground circuit, computer ground circuit, how to quickly identify a ground circuit problem, what is the difference between a sensor ground and computer ground, how to check main computer grounds, Tools used: scan tool, labscope, Digital multimeter (can be used instead of a scope), Related videos: Poor running, flashing CEL, no codes (bad computer ground) https://youtu.be/44dP6X3QS5A, Low Fuel Pressure from a bad fuel pump ground https://youtu.be/rQ7tvIxQSt0, MAF sensor trouble code (P0102) caused by a bad ground https://youtu.be/bJRLZnjS6ms, Engine does not crank (bad block ground) https://youtu.be/32S0WMj3GSQ, How to test a starter motor (No Crank Testing) bad ground https://youtu.be/ytrcqM8wyW0, Fuel Pump Relay Problem https://youtu.be/CEjmo_qT4yQ, Playlist: ground circuit problems https://www.youtube.com/playlist?list=PLAFYVCyenqcr32wgsCqa1Zj4335YlBF5p 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. Mon, 04 May 2026 01:22:23 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/df809970-23a9-440e-a465-0a2fbb5bbfda All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.