Air sucking back through exhaust - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 05-08-2011, 07:13 PM Thread Starter
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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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post #2 of 4 Old 05-08-2011, 07:16 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.

Jimmy
97 F-250 ECLB 7.3/E4OD/4wd, 216k miles: FFD 250/200%'s, stock turbo, built trans, e-fuel, Swamps IDM, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube. Built and tuned by me
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97 F-250 ECSB project truck:250/2's, Gen 3, S468, SD axles, studs/springs, ZF-6
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post #3 of 4 Old 05-09-2011, 08:20 AM Thread Starter
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Is that normal
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post #4 of 4 Old 05-09-2011, 08:38 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

Trucks and parts............
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