Cylinder 3 low compression. Bad valve seal? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Phantez · 01-21-2015, 08:37 PM

My car has a stock s15 sr20. It's always burned a bit of oil on deceleration, but it started getting much worse towards the end of summer. I usually like to downshift through the gears as I'm slowing down and every once in a while it would make a big puff of smoke out when i grab a gear on decel. It clearly smelled like burnt oil. I didn't notice anything on accel.

The car runs fine, makes decent power. Doesn't smoke or smell like burning oil at idle or on start up. It does have some intermittent surging at idle but I'm pretty confident that's unrelated, probably TPS or something. It's been in storage for winter but i decided to run a compression test today. I let it warm up to temp, didn't smoke or smell burnt oil while idling in the garage. Results were 148, 148, 105, 148.

When i pulled the spark plugs, all 4 where a nice golden brown color at the tip. Coolant is clean and clear.

Only thing I can thing of is something with valves. Any ideas?

01-21-2015, 08:37 PM	#1
Phantez Join Date: Jan 2010 Location: iowa Age: 36 Posts: 30 Trader Rating: (1) Feedback Score: 1 reviews	Cylinder 3 low compression. Bad valve seal? My car has a stock s15 sr20. It's always burned a bit of oil on deceleration, but it started getting much worse towards the end of summer. I usually like to downshift through the gears as I'm slowing down and every once in a while it would make a big puff of smoke out when i grab a gear on decel. It clearly smelled like burnt oil. I didn't notice anything on accel. The car runs fine, makes decent power. Doesn't smoke or smell like burning oil at idle or on start up. It does have some intermittent surging at idle but I'm pretty confident that's unrelated, probably TPS or something. It's been in storage for winter but i decided to run a compression test today. I let it warm up to temp, didn't smoke or smell burnt oil while idling in the garage. Results were 148, 148, 105, 148. When i pulled the spark plugs, all 4 where a nice golden brown color at the tip. Coolant is clean and clear. Only thing I can thing of is something with valves. Any ideas?