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6.0 making strange noise when I let off on the throttle

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Old 12-21-2009, 03:53 PM
cynicel1 cynicel1 is offline
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6.0 making strange noise when I let off on the throttle

If while going slow or from a stop I accelerate rapidly then suddenly release pressure on the throttle there is a loud noise from the engine compartment. It sounds like it is coming from the air intake area, maybe like a valve is slamming shut and causing the engine to choke. If I release the throttle slowly with no load on the engine this does not happen. Any ideas?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
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Old 12-21-2009, 04:00 PM
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Sounds like "turbo fart". That's a normal sound, particularly on a cold engine, although it is louder if you have an aftermarket cold air intake. Because these engines do not have a waste gate, excess boost pressure can backflow when you let off the throttle suddenly.
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Old 12-21-2009, 04:31 PM
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Thanks for the response, sounds reasonable but I never noticed it before and now I hear it regularly.
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Old 12-21-2009, 04:35 PM
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Do you have the original Ford air intake?
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Old 12-22-2009, 09:32 AM
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Yes but I replaced the filter with a K and N filter.
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