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SVTPerformance's Chain of Restaurants
The Blower Bistro
96 Cobra Hellion 76mm Turbo Kit Install
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<blockquote data-quote="IUP99snake" data-source="post: 11781030" data-attributes="member: 7060"><p>It could be some sort of vacuum/boost leak, and not just in the piping, but in every hose, tube, or valve that connects to the intake manifold or boost tubes. Given its got a draw through maf, everything past the maf is metered air.. Including the PCV's. </p><p></p><p>How are the pcv's routed? The pcv's themselves are supposed to be check valves but they don't do a good job holding boost.. Not to mention the large rubber fitting in the cam cover that they plug into can be leaky. If its leaking any boost, it'll create a rich condition because that is all metered air so the engine is thinking that air should be entering the engine but instead it is entering the wrong part of the engine through the pcv hoses and valves. It's adding the fuel it should be adding, but the air that should be accompanying that fuel is not there. </p><p></p><p>Try plugging up the pcv fittings on the pipes and/or the intake manifold and just running breathers on both sides. We can debate the use of breathers vs pcv vs crankcase vacuum pumps in another discussion, but this is just to temporarily eliminate one area where it is possible for the boost / metered air to be leaking. </p><p></p><p>Carefully bring it up to the trouble spot and see if it still happens.. </p><p></p><p>Does anyone else agree with me that the PCV could be a possible trouble area? How does everyone else have their PCV set up? </p><p></p><p>I had breathers for the longest time. I can't remember how I had it before the breathers. I have a blow through maf setup. I just recently ran both PCV lines to a T fitting and routed a single line to the blower intake tube. After a few days, it tripped a check engine light and threw a lean code for both banks. No noticeable driveability or performance problems though. It can't be a metered air leak because it's routed before the MAF. I think the oil from the PCV may have gotten on the MAF being that I don't have oil catchers in the pcv lines. I've had that code before, and when I clean the MAF, the code goes away. I might hook up that hose to a vacuum port on the intake manifold after the throttle body where the drivers side pcv once was connected..but I'm probably just gonna put the breathers back on because I don't trust the PCV valves or the entire system to keep metered air contained. It worked fine with the breathers, and when I messed with it, I got a check engine light</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 11781030, member: 7060"] It could be some sort of vacuum/boost leak, and not just in the piping, but in every hose, tube, or valve that connects to the intake manifold or boost tubes. Given its got a draw through maf, everything past the maf is metered air.. Including the PCV's. How are the pcv's routed? The pcv's themselves are supposed to be check valves but they don't do a good job holding boost.. Not to mention the large rubber fitting in the cam cover that they plug into can be leaky. If its leaking any boost, it'll create a rich condition because that is all metered air so the engine is thinking that air should be entering the engine but instead it is entering the wrong part of the engine through the pcv hoses and valves. It's adding the fuel it should be adding, but the air that should be accompanying that fuel is not there. Try plugging up the pcv fittings on the pipes and/or the intake manifold and just running breathers on both sides. We can debate the use of breathers vs pcv vs crankcase vacuum pumps in another discussion, but this is just to temporarily eliminate one area where it is possible for the boost / metered air to be leaking. Carefully bring it up to the trouble spot and see if it still happens.. Does anyone else agree with me that the PCV could be a possible trouble area? How does everyone else have their PCV set up? I had breathers for the longest time. I can't remember how I had it before the breathers. I have a blow through maf setup. I just recently ran both PCV lines to a T fitting and routed a single line to the blower intake tube. After a few days, it tripped a check engine light and threw a lean code for both banks. No noticeable driveability or performance problems though. It can't be a metered air leak because it's routed before the MAF. I think the oil from the PCV may have gotten on the MAF being that I don't have oil catchers in the pcv lines. I've had that code before, and when I clean the MAF, the code goes away. I might hook up that hose to a vacuum port on the intake manifold after the throttle body where the drivers side pcv once was connected..but I'm probably just gonna put the breathers back on because I don't trust the PCV valves or the entire system to keep metered air contained. It worked fine with the breathers, and when I messed with it, I got a check engine light [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
96 Cobra Hellion 76mm Turbo Kit Install
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