EdwinCheng

I have a question about the compression test.

When i do the compression i remove all the spark plugs and take out the fuse for fuel.

and i use the compression gauges hock up to the cylinder, and i start to crank the car. And the compression is slowly go up. Just like each revolutions go up about 10 psi.. And i didnt count how many revolutions or how long i crank the engine for 4 cylinder. I crank it until the compression at the max.

I think i get the same result of all cylinder but different revolutions

For example, at the first cylinder maybe 10 revolutions, but for the second cylinder is 5 revolutions until the compression at the max.


It that correct to check the compression? I crank it until the gauges stop moving up

TheRealTegger

Three seconds in Google revealed these results, which includes some YouTube videos:
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GagnarTheUnruly

iTrader: (3)

Yes I think you have it right.

1 warm up engine
2 bridge service connector
3 pull pgmfi fuse
4 unplug distributor
5 remove plug 1
6 insert tester and snug
7 crank engine until tester maxes out
8 replace plug 1
Repeat 5-9 for each plug

The amount of time it takes for compression to level out is not important, I think. What were your numbers.?

EdwinCheng

I cant warm up the engine because my car is wont start

1 cylinder is 190psi
2 cylinder is 195psi
3 cylinder is 180psi
4 cylinder is 185psi

All cylinder need to take a different amount of time for compression.

EdwinCheng

When i turn the crankpulley, i didnt hear much compression as before. The first time, i can easy to hear the compression in the cylinder, but now just only a little bit sound of compression

B serious

iTrader: (1)

Test under the same conditions. Consistency is important. I don't necessarily warm up cars before testing.

-Remove ALL the plugs.
-Remove PGM FI fuse
-Hold throttle WIDE OPEN
-crank till tester won't go higher.
-Do all 4 cylinders the SAME WAY

Only issue with nor warming it up is that the numbers will be slightly lower...and the compression may rise by the time you get to cyl 4. Because you're getting more and more oil film on the cylinder walls. But this is negligible.

There are more than 1 ways to do this test. But you have to be consistent. Each cylinder should get the same conditions as the last.

EdwinCheng

As you said, i did it right.