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My engine makes a whomp whomp whomp sound when under load and particularly when accelerating. I'm trying to find out what the cause of the noise is. Is it a vacuum issue? A valve issue? Mounts?

2007 Mercury Mountaineer Premier AWD 4.6L V-8 3V Engine Head Gaskets, exhaust manifold gaskets and intake manifold gaskets just replaced Heads checked out ok, no cracks or warps Valve seals replaced Injector O-Rings replaced New Spark Plugs New Oil and Filter and new Coolant

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Sounds like the Throttle position sensor is activating the Rev. Limiter. Take the vehicle back to the shop that did the head work and request an OBDII scan. Get a print out of the stored fault history. Let the print out be your guide to any repairs. The Mercury is to new, to need head work, unless severe overheating occurred.

Posted on May 19, 2017

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Posted on Jan 02, 2017

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Check your coolant level, low coolant or air in your cooling system will make a "thud"noise in your heater core when the engine is under load from acceleration. The coolant rushes in to the heater core where the air pocket is trapped and then your hear the noise.
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Thank you for using fixya and good luck

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The serpentine belt is the most common cause for whining sound when accelerating, try to understand if noise is coming from serpentine belt.

Also check power steering belt under steering column, and also the rotor and chain, thei do not make whining noise , but can make noise when accelerating.

The belt is first suspect.

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