Air sucking back through exhaust - Ford Powerstroke Diesel Forum
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Old 05-08-2011, 06:13 PM
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Air sucking back through exhaust

I start my truck up and it sounds like it sucks air back through the exhaust only does it for a second.its pretty loud.anyone know what this is
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Old 05-08-2011, 06:16 PM
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Exhaust back pressure valve closing. The PCM runs a test at start-up, closes it then opens it right back up.
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Old 05-09-2011, 07:20 AM
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Is that normal
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Old 05-09-2011, 07:38 AM
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nothing id be worried about. Its normal. If you lived in a colder climate it would stay shut for longer
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