0 Compression? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

FD.Fred · 07-29-2010, 10:04 PM

Ok, so here's the deal. My car started misfiring like crazy after a little run down the highway. I figured I'd do a compression test. Cylinders 1 to 3 are tip-top, cylinder four though as 0 compression. Where should I go from there? What are the possible issues? Bent exhaust or intake valve, broken head gasket, damaged rocker arm... Anybody ran into some similar issue? Ill take any advice I can! My next step would be a leak test. Thanks guys!

stealthsr20 · 07-29-2010, 11:51 PM

ti could be a number of things, leak down and see!

essforteen · 07-30-2010, 12:01 AM

Did the car overheat?
It could be a broken ring land!
Or bent valves or as small as a had gasket!
GL. Leak down test will help determine if valves are good!!

rhd_sw20 · 07-30-2010, 02:05 AM

over rev?
had the exact same problems. #4 rocker arm came off.

*fliprayzin240sx* · 07-30-2010, 04:20 AM

sounds like a broken ring land or a hole in the piston.

*handinpants* · 07-31-2010, 01:21 AM

I would say leak down, open up your radiator cap and oil cap, and listen, listen forthat air noise from exhaust, or from oil cap, listen for air in intake, and watch for bubble in coolant.

TheWolf · 07-31-2010, 09:07 AM

leakdown and listen with a mechanics stehiscope. Probably either a bent valve or a hole in piston. Blown headgaskets and broken ringlands usually result in some compresson. 10psi or so. You'll find the air is blowing up the intake (intake valve) out the exhaust port (exhaust valve) or remove the dipstick (better than oil fill cap) and it will be blowing through the hole in the piston.

FD.Fred · 08-01-2010, 10:02 AM

thanks guys, ill look it up and keep u posted!

07-29-2010, 10:04 PM	#1
FD.Fred Join Date: Jul 2010 Location: Ottawa Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	0 Compression? Ok, so here's the deal. My car started misfiring like crazy after a little run down the highway. I figured I'd do a compression test. Cylinders 1 to 3 are tip-top, cylinder four though as 0 compression. Where should I go from there? What are the possible issues? Bent exhaust or intake valve, broken head gasket, damaged rocker arm... Anybody ran into some similar issue? Ill take any advice I can! My next step would be a leak test. Thanks guys!

07-30-2010, 04:20 AM	#5
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	sounds like a broken ring land or a hole in the piston. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

07-31-2010, 01:21 AM	#6
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 41 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	I would say leak down, open up your radiator cap and oil cap, and listen, listen forthat air noise from exhaust, or from oil cap, listen for air in intake, and watch for bubble in coolant. __________________

07-31-2010, 09:07 AM	#7
TheWolf Zilvia FREAK! Join Date: Aug 2005 Location: Orange Park, FL (Jax) Posts: 1,468 Trader Rating: (0) Feedback Score: 0 reviews	leakdown and listen with a mechanics stehiscope. Probably either a bent valve or a hole in piston. Blown headgaskets and broken ringlands usually result in some compresson. 10psi or so. You'll find the air is blowing up the intake (intake valve) out the exhaust port (exhaust valve) or remove the dipstick (better than oil fill cap) and it will be blowing through the hole in the piston. __________________ Eye on the Prize

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07-29-2010, 11:51 PM	#2
stealthsr20 Zilvia Member Join Date: Nov 2008 Location: oklahoma Age: 40 Posts: 256 Trader Rating: (3) Feedback Score: 3 reviews	ti could be a number of things, leak down and see!

07-30-2010, 12:01 AM	#3
essforteen Nissanaholic! Join Date: Apr 2007 Location: LAX Area (So CAL) Posts: 1,802 Trader Rating: (50) Rides Gallery: essforteen Feedback Score: 50 reviews	Did the car overheat? It could be a broken ring land! Or bent valves or as small as a had gasket! GL. Leak down test will help determine if valves are good!!

07-30-2010, 02:05 AM	#4
rhd_sw20 Zilvia Member Join Date: May 2006 Location: calgary Posts: 210 Trader Rating: (0) Feedback Score: 0 reviews	over rev? had the exact same problems. #4 rocker arm came off.

08-01-2010, 10:02 AM	#8
FD.Fred Join Date: Jul 2010 Location: Ottawa Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	thanks guys, ill look it up and keep u posted!