Compression Test: PSI differences?
After doing a compression test these are the numbers that came up. And I'm wondering why there is such a difference between them all.
When doing this.. I warmed up the car, Pulled the fuel pump fuse, let the car run to stall, pulled the 1st plug out, hooked up the gauge, held gas pedal down, turned the crank until gauge didn't raise anymore.
From there left the 1st spark plug out and went down the line. When I got to #4 all other 3 plugs were out. And in #4 is where I got the highest PSI..
Any idea why? Here are the pics.. You can see the differences.
155-165-160-170
When doing this.. I warmed up the car, Pulled the fuel pump fuse, let the car run to stall, pulled the 1st plug out, hooked up the gauge, held gas pedal down, turned the crank until gauge didn't raise anymore.
From there left the 1st spark plug out and went down the line. When I got to #4 all other 3 plugs were out. And in #4 is where I got the highest PSI..
Any idea why? Here are the pics.. You can see the differences.
155-165-160-170