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Discussion Starter · #1 ·
Hi

i am taking my car to the shop this week and among the things I want them to do is to run a compression check on all 4 cylinders

How do they actually do this and how may psi per cylinder should be I be looking for in a 99 corolla?

Thanks
 

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96 3MZ M/T
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they test it by removing the spark plug and put a gauge in it's place. then they turn the crank shaft and see what it goes too. i think they also leave it there for a moment to make sure it keeps at that pressure and what not .....
 

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Discussion Starter · #3 ·
oh, I see....

And what should be good numbers for my corolla?
 

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shouldnt all the cylinders be the same psi? and isnt it diff for all cars so whats like an adverage?
 

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Discussion Starter · #5 ·
I read while googling that on average they should be aroound 150psi. But they were talking about v6 engines and i dont know if it varies from one egine to the next. (especially when it is a smaller engine)

Can anyone confirm this?
 

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Country Hick
2001 Nissan Pulsar
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hdsalinas said:
I read while googling that on average they should be aroound 150psi. But they were talking about v6 engines and i dont know if it varies from one egine to the next. (especially when it is a smaller engine)

Can anyone confirm this?
I dont know the actual figure... but i do know that the difference between the best and worst should be no more than 9psi... if it is, one would suspect you have either cracked rings or a blown head gasket.
 

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96 3MZ M/T
Camry
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yes i belive that they would differ from engine to engine depending on compression ratio's and what not
 
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