In this video I will be showing you how to use starter current to determine cylinder compression. First I will show you a known good pattern, then I will simulate a no compression problem in one cylinder by removing a spark plug. Finally, I will show you how to synchronize the starter current waveform with an ignition firing event in order to determine which cylinder in the firing order has the compression problem.

Engine Performance Diagnostics chapter 16

symptoms 50

  • no start
  • no fuel pressure

fix 50

  • replace faulty fuel pump

test shown enh 50

  • how to measure fuel pressure
  • how to test the fuel pump relay
  • how to test for proper power and ground to a fuel pump
  • how to test the transfer pump
  • how to test for a proper ground on your test light
  • how to command a fuel pump relay to turn on with a scan tool
  • how to test the computer's control of the fuel pump relay
  • how to determine fuel pump wiring without a diagram

Tools used

  • scan tool
  • test light
  • back-probing tools
  • fuel pressure gauge

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(Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing

Related videos:

How to test an electric fuel pump (1997 4.3L Chevy Blazer CPI):


Low Fuel Pressure from a bad fuel pump ground (Ford Ranger):


How to test an electric fuel pump (no fuel psi testing) Ford:


Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM:


No Start No Fuel Pressure Troubleshooting:


How to test fuel pressure, injector pulse and spark with basic tools:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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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!