Vacuum leak and the IRIS valve - The Subaru SVX World Network

10-17-2011, 02:53 PM

Huskymaniac Huskymaniac is offline

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Vacuum leak and the IRIS valve

From what I have read, the IRIS valve opens at 4000 RPMs. Below this, the two halves of the intake manifold are isolated. If the vacuum line between the pressure regulator and the nipple on the right/passenger side of the intake manifold were to leak, would that cause the air/fuel ratio to be too high on that bank and only on that bank (below 4000 RPMs) and the ECU to adjust fuel trim up to compensate?

What other vacuum lines are connected in a way that could cause an imbalance between the banks when the IRIS is closed?

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Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything

Last edited by Huskymaniac; 10-17-2011 at 02:59 PM.

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