B18C1 -- Integra 98 GSR:

I recently got a CEL and checked the code and it read, "Cylinder 3 Misfire & 1 Misfire or Ignition ... Issue", then I did a compression test and the results was;

Cylinder 1: 210 PSI
Cylinder 2: 210 PSI
Cylinder 3: 150 PSI
Cylinder 4: 220 PSI

Then what I did was I placed a cap full of oil in Cylinder 3 and ran the test again, it advanced +10 @ 160PSI...

What can be the issue?? Please help... Thanks!!!

 

Adjust your valves and retest. A valve adjusted too tightly will yield a low compression test number. You could also have a bent valve? Have you overrevved the engine?

 

Bent valve or as dogginator said, the valve lash is set too tightly and its holding the valve open. The oil added a little volume which added a little bit of compression. If it was bad rings then the oil would've sealed that up and shot it up to 200 or so. It could also be a blown/partially blown headgasket, but thats unlikely if your coolant and oil arent mixing or burning off.

 

I haven't over revved my engine after I changed my exhaust valve... can it be a piston or piston ring??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evotux &raquo;</TD></TR><TR><TD CLASS="quote">I haven't over revved my engine after I changed my exhaust valve... can it be a piston or piston ring??</TD></TR></TABLE>

When and why did you change the exhaust valves? Did you change all of them?

 

Sounds like you overreved, put in new valves and either 2 of those were bent or you also bent 2 intake valves.

 

my clutch was going out, (my clutch broke off couple of pieces) which made me mis-shift and I over revved my engine... i bent 4 exhaust valves but replaced all 8 exhaust valves. it was in cylinder 1 and 3 i think..

 

Did you have the head pressure tested to make sure the valves were seating properly? Could be one of the seats were damaged by a bent valve. Could be a bent intake valve.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95 integra &raquo;</TD></TR><TR><TD CLASS="quote">Did you have the head pressure tested to make sure the valves were seating properly? Could be one of the seats were damaged by a bent valve. Could be a bent intake valve. </TD></TR></TABLE>

I have never heard of an intake valve bending due to an overrev. The exhaust valves bend because the pistons chase them as they are closing. If they float, the pistons catch them.

The valve seats could be a problem. Who did the head work? Regardless, adjust the valves first before proceeding.

 

The intake valves bend because they hit the exhaust valves. The exhaust valves bend inward towards the intake valves and then the intakes open. Given I believe the intake valves only hit if you are "in vtec" but they will bend. On a motor that I bought with bent exhaust valves, it turned out that a few of the intakes were bent as well.....very minorly so it was extremely hard to see.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95 integra &raquo;</TD></TR><TR><TD CLASS="quote">The intake valves bend because they hit the exhaust valves. The exhaust valves bend inward towards the intake valves and then the intakes open. Given I believe the intake valves only hit if you are "in vtec" but they will bend. On a motor that I bought with bent exhaust valves, it turned out that a few of the intakes were bent as well.....very minorly so it was extremely hard to see.</TD></TR></TABLE>

That is one hell of an overrev. That must be the 5-2 instead of the 3-2 money shift.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">

That is one hell of an overrev. That must be the 5-2 instead of the 3-2 money shift. </TD></TR></TABLE>

Well it probably also depends on the pistons you have as well. The dome tops probably push the valves up further then flat tops. Also the motor I had was probably a busted timing belt (or stripped teeth) and not an overrev.

 

i adjusted my valves to the correct position, now the 3rd cylinder reads at 160PSI, with a cap full of oil, it reads at 180 PSI... I was working on the car with one of my buddy... he is thinking that it might be the piston rings... if it is, what brand/oem... and where could i get standard piston rings...
---&gt; Could it also be a crack piston? or would it read a very low PSI??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evotux &raquo;</TD></TR><TR><TD CLASS="quote">i adjusted my valves to the correct position, now the 3rd cylinder reads at 160PSI, with a cap full of oil, it reads at 180 PSI... I was working on the car with one of my buddy... he is thinking that it might be the piston rings... if it is, what brand/oem... and where could i get standard piston rings...
---&gt; Could it also be a crack piston? or would it read a very low PSI?? </TD></TR></TABLE>

It sounds like it is time for a leak down test.

 

Just pore the entire bottle of oil in it....the compression will go up....I promise. Leak down test FTW!!!