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Old 05-19-2016, 08:14 PM
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upallnight upallnight is offline
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Originally Posted by 4.8iS Le Mans_NZ View Post
Would be plausible only if the idle vacuum is greater than the vacuum present at higher rpm, which seems wrong to me.
Have you considered trying the thicker oil solution?
At WOT (wide open throttle) there is very little manifold vacuum. At idle because the throttle plate is close and there is just a tiny gap for air to pass through, the vacuum is High. Don't believe this, connect a vacuum gauge at an manifold inlet such as the brake booster and see the vacuum at idle and the vacuum when the throttle is opened.
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