Need SR20help. Desprate. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

HalveBlue · 08-10-2006, 11:17 AM

As far as the oil in your FMIC piping is concerned, on a stock set up the PCV valve is connected to the Intake pipe. I believe the theory behind this is that any pressurized oil is removed from the engine and fed through the intake system to be burned up during the normal combustion cycle. So, it's normal, but probably not advisable.

Also, I've heard that while this is normal, it can also sometimes mask problems associated with the turbocharger.

As for the misfire, I don't know if you're running an atmospheric BOV, but if you are, I know that this causes the engine to backfire every once in a while. I believe it stems from the fact that the ECU adjusts the air-fuel mixture before the air is vented. Subsequently, once your BOV releases the air to the atmosphere the mixture is now much richer than what the ECU accounted for.

Good luck on your car. I know how it feels, I'm working on putting a new headgasket on mine.

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08-10-2006, 11:17 AM	#1
HalveBlue Zilvia FREAK! Join Date: Mar 2004 Location: I'm somewhere where I don't know where I am! Posts: 1,549 Trader Rating: (0) Feedback Score: 0 reviews	As far as the oil in your FMIC piping is concerned, on a stock set up the PCV valve is connected to the Intake pipe. I believe the theory behind this is that any pressurized oil is removed from the engine and fed through the intake system to be burned up during the normal combustion cycle. So, it's normal, but probably not advisable. Also, I've heard that while this is normal, it can also sometimes mask problems associated with the turbocharger. As for the misfire, I don't know if you're running an atmospheric BOV, but if you are, I know that this causes the engine to backfire every once in a while. I believe it stems from the fact that the ECU adjusts the air-fuel mixture before the air is vented. Subsequently, once your BOV releases the air to the atmosphere the mixture is now much richer than what the ECU accounted for. Good luck on your car. I know how it feels, I'm working on putting a new headgasket on mine.