egr questions... - Page 3 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

techn9ne · 08-21-2008, 06:00 PM

Quote:

Originally Posted by twastheglow

Correct. So I ordered this cap to remedy that. JGS Precision Turbo (click on 240sx products, it's almost at the bottom of the page)

Would not having it attached to the intake manifold cause the stumbling and dying at idle you were talking about?
*mike*

no. since its not hooked up to exhaust gas anymore, the egr should not be making your car stumble at idle, even if you have it open. if it is disconnected at the exhaust side, and connected to the intake manifold, and the egr valve is open, then it would be a boost leak on the intake side under pressure. however, when your intake manifold is under vacuum instead of pressure, then an open egr valve would be letting in un metered air in, creating a lean condition, and your ecu would add fuel.

twastheglow · 08-21-2008, 06:01 PM

So...knowing how it's currently hooked up...does that seem like my problem? Would a boost leak like that cause me these problems @ idle etc.?
*mike*

techn9ne · 08-21-2008, 06:08 PM

Quote:

Originally Posted by twastheglow

So...knowing how it's currently hooked up...does that seem like my problem? Would a boost leak like that cause me these problems @ idle etc.?
*mike*

honestly, im not sure. its not like im looking at the car. but your car should be under vacuum at idle, not boost.

twastheglow · 08-21-2008, 06:47 PM

Quote:

Originally Posted by techn9ne

honestly, im not sure. its not like im looking at the car. but your car should be under vacuum at idle, not boost.

Then what in the world would cause my car to just die after idling for a couple minutes. It's not even like the idling is labored. It seems like it idles fine, then all the sudden it dies and doesn't want to start again. Then once I get it started I have to keep a foot on the gas or it wants to die. And it sounds like shit when I'm revving it.

I was really hoping capping the egr pipe was going to solve all those problems. Now after talking to you, I'm wondering if it's even going to!
*mike*

twastheglow · 08-21-2008, 08:27 PM

So I just got in from trying to do a boost leak check. We ran into some other issues and never got around to completing it. I did however find (and I'm quite embarassed to say this) that the intake piping was very loose where it couples to the actual turbo. Like loose enough that I could just pull it off. Thinking back, it must have happened when I went to clean the MAF with cleaner. I STUPIDLY never tighten the clamps back up. And it was right after that that I tried driving my car home where I ran into all kind of problems. So now my question is this...what happens (symptoms) when a car is pulling more air in than what was metered by the MAF? Because that clearly must have been an issue. Aside from that, why would it want to over heat over and over on the way home? It ran like 10 lbs. of shit in a 6 lbs. bag.
*mike*

techn9ne · 08-22-2008, 04:56 PM

Quote:

Originally Posted by twastheglow

So I just got in from trying to do a boost leak check. We ran into some other issues and never got around to completing it. I did however find (and I'm quite embarassed to say this) that the intake piping was very loose where it couples to the actual turbo. Like loose enough that I could just pull it off. Thinking back, it must have happened when I went to clean the MAF with cleaner. I STUPIDLY never tighten the clamps back up. And it was right after that that I tried driving my car home where I ran into all kind of problems. So now my question is this...what happens (symptoms) when a car is pulling more air in than what was metered by the MAF? Because that clearly must have been an issue. Aside from that, why would it want to over heat over and over on the way home? It ran like 10 lbs. of shit in a 6 lbs. bag.
*mike*

unmetered air makes your car run lean. the ecu will try and compensate by dumping in more fuel and adjusting the idle air control.

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08-21-2008, 06:01 PM	#62
twastheglow Zilvia Member Join Date: Sep 2005 Location: Binghamton, NY Age: 40 Posts: 194 Trader Rating: (0) Feedback Score: 0 reviews	So...knowing how it's currently hooked up...does that seem like my problem? Would a boost leak like that cause me these problems @ idle etc.? mike

08-21-2008, 08:27 PM	#65
twastheglow Zilvia Member Join Date: Sep 2005 Location: Binghamton, NY Age: 40 Posts: 194 Trader Rating: (0) Feedback Score: 0 reviews	So I just got in from trying to do a boost leak check. We ran into some other issues and never got around to completing it. I did however find (and I'm quite embarassed to say this) that the intake piping was very loose where it couples to the actual turbo. Like loose enough that I could just pull it off. Thinking back, it must have happened when I went to clean the MAF with cleaner. I STUPIDLY never tighten the clamps back up. And it was right after that that I tried driving my car home where I ran into all kind of problems. So now my question is this...what happens (symptoms) when a car is pulling more air in than what was metered by the MAF? Because that clearly must have been an issue. Aside from that, why would it want to over heat over and over on the way home? It ran like 10 lbs. of shit in a 6 lbs. bag. mike