Can anybody help me,....
Yesterday I check my car pressure, there are 150, 150, 150, 50 (PSI)
by the way I check the pressure from the spark plug...

So, what do I have to do?
Is that my valve? or my piston ring?

Thanks.

 

Take it to a shop for a leak-down test.
If I were you I would do the test a couple of times, maybe you already have.

Another thread recently, showed that not all Compression Test Kits are created equal, you may want to find someone who will let you barrow theirs for a comparison of the numbers.

 

To eliminate the rings as the problem, you could put a little oil in the cylinder and re-check the compression. If it's higher, that means the oil is sealing up the leaks in worn or broken rings. If it doesn't change, it could mean your valves are the problem.

 

Like the Perfectionist said you might need a valve adjustment...

 

What kind of oil do I have to put?

May I know where is the cylinder is located?
Is that under the spark plug?

Thanks

 

Do you know how much it cost?

 

yes, the cylinder is located below the sparkplug which is in the head that sits on the block that attaches to the gearbox that is joined by a clutch that is spun by the crankshaft that is covered in bearings that are connected to the rods which are joined to the ......pistons!!!!!!!!!!

t..

PS engine oil - for your engine.

 

thank you so much for the deatail information....

But I stillhave one more qustion.... (sorry)
So, to put the oil can I just take out the spark plug and then put the oil or do I have to take the whole engine block out?

Thanks again....

 

yeah - the spark plug fires a spark into the top of the combustion chamber where the compressed air/fuel mixture ignites and pushes the piston down to spin the crankshaft (really fast!!!)

so you want the oil in the combustion chamber because thats where the compression occurs...use a small syringe or squirt bottle to squirt the oil into the top of the cylinder - you only need enough oil to soak the rings on the piston

all you are trying to do is create more compression by sealing the rings to the cylinder walls to test the compression.

PS are you doing the test with the throttle held wide open? did you take all the s.plugs out then do the tests???

good luck - do you have a shop manual or know someone you could borrow one from?

t..

 

It doesn't sound like you should be doing this by yourself.

Take it to a shop and ask for a compression / then a leak-down test.