i have a prob the #1,2,4 cyl have 270 the number 3 has 150 what do you think it is how can i fix it?
thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94civicexlsvtec &raquo;</TD></TR><TR><TD CLASS="quote">i have a prob the #1,2,4 cyl have 270 the number 3 has 150 what do you think it is how can i fix it?
thanks</TD></TR></TABLE>
Do a leakdown test to narrow down the problem before you take it apart.

 

whats a leak down test?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94civicexlsvtec &raquo;</TD></TR><TR><TD CLASS="quote">whats a leak down test?</TD></TR></TABLE>

Do your leakdown test by applying 100 psi of air into the cylinder while the cylinder is on it's compression stroke at TDC, make sure all your spark plugs are removed. While the air is in the combustion chamber do the following steps:

1. Remove radiator cap and look for bubbles, if you see bubbles then your headgasket is bad.

2. Put your ear next to the cylinders on each side of the one you're testing, if you hear air seeping through then your head gasket is bad.

3. Remove air filter, if you hear air, then you have either a sticky intake valve or broken valve spring.

4. Put ear near exhaust pipe, if you hear air then it's sticky exhaust valve or broken valve spring.

5. Remove oil cap, if you hear air, then you have bad piston rings.


Edit: I haven't done a leakdown test in many many years, so if I missed something, then feel free to correct me.

 

ok found out what it was.....bad rings no how bad would it be if i keep driving the car? say for 3-4 days also how do i know what rings to buy they were already in the block when i bought it built by dh racing..what would have made the rings go bad? and last can i just replace the bad rings or do i need to replace them all?

 

Awsome explanation of the leak down test, I've always wondered what it was also. Is there a way to replace rings without taking the block out of the car?

 

yesyou can but i wouldnt mess with doing it just yank it out and rebiuld it the right way

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94civicexlsvtec &raquo;</TD></TR><TR><TD CLASS="quote">ok found out what it was.....bad rings </TD></TR></TABLE>
How do you know it's not a bad piston?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slomofo &raquo;</TD></TR><TR><TD CLASS="quote">... 5. Remove oil cap, if you hear air, then you have bad piston rings.

Edit: I haven't done a leakdown test in many many years, so if I missed something, then feel free to correct me.</TD></TR></TABLE>
How about this... If you hear it from your oil cap, it could also be a bad piston.

 

It was the piston. Will have a new one in the morning.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NismoNX &raquo;</TD></TR><TR><TD CLASS="quote">It was the piston. Will have a new one in the morning.</TD></TR></TABLE>
What happened to it?

 

the ring land broke into like 4 pieces i think it was detionaon(btw i cannot spell) anyway im in the process of installin a new one right now. that are pr3 piston which ones whould be best to put in if this happens agin?

 

detionaon.....thats some funny ****!!!!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NismoNX &raquo;</TD></TR><TR><TD CLASS="quote">detionaon.....thats some funny ****!!!!!!!!</TD></TR></TABLE>
I think he means detonation.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboD16Chiovnidca &raquo;</TD></TR><TR><TD CLASS="quote">
I think he means detonation. </TD></TR></TABLE>

I know he's a friend of mine, and I am always giving him hell about how he can't spell.