Compression test instructions needed

Tiny
STEPHEN MARTINEZ JR
  • MEMBER
  • 1994 SUBARU IMPREZA
  • 1.8L
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 20,000 MILES
What is the proper compression rating when doing a compression test?
Saturday, December 17th, 2016 AT 6:16 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
All cylinders should be within twenty percent of each other compression varies due to compression ratio but you need at least ninety psi to run right on all cylinders.
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Saturday, December 17th, 2016 AT 8:01 AM

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