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Compression Test Question

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Do you not have to disconnect the gas when doing a compression test? I know you're supposed to do it with the throttle full open, but won't gas start shooting out the cylinders with the plugs out?

Sorry if it's a dumb question. I'm going to be doing a compression test for the first time this week.
 
No problem.Just keep the throttle WO and no fuel will come out.The air/fuel mix is a vapor.If you want to just pinch off the fuel line where it comes out of the tank. :)
 
What is the purpose of opening the throttle?
 
:) With the throttle closed there is almost no air being pulled into the cylinder thus nothing to compress. :)
 
Ah! Makes sense! The compression tester I just bought had instructions telling me to unplug the ignition leads as well as pull the plugs. Seems redundant to me, am I missing something? Also, do I keep the plugs in the other cylinders that I am not testing, or pull 'em all out together?
 
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