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What do i look for after the egr valve and manifold intake area are clean and 1491 code appears?

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I changed the EGR valve. I have cleaned the manifold under the fuel injectors connected to the egr valve. Code 1491 appears. What to inspect next?

Vehicle: 1997 honda accord ex

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P1491 Exhaust gas recirculation insufficient lift

Check the vacuum hose routing.

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