Mazda 626 Problem Report

Mazda 626 Rough Idle Due to Intake Manifold Vacuum Leak

(2 reports)

The intake manifold gasket can fail causing vacuum a leak and/or a rough idle condition. Replacement of the leaking gasket will be necessary to correct this concern.

Surged to the point of stalling. I ended up spraying carb cleaner at the point where the intake met up to the head and found when spraying the carb lceaner at the no 1 cylinder, the engine speed noticibaly changed. The Intake gasket was replaced and the issue was resolved. -
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The "Bypass Air Control Valve" can fail causing a low engine idle and possibly stalling.