strange sound from exhaust - Ford Powerstroke Diesel Forum
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Old 04-22-2010, 07:25 AM
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strange sound from exhaust

my truck is making this sucking sound from the exhaust but it doesent effect how it runs i looked allover but could not find anything. so i thought i would post it here to see if anyone might know what it is. any help would be great thanks.
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Old 04-22-2010, 07:37 AM
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Is this when it's warming up? Is your truck turbo or naturally aspirated?
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Old 04-22-2010, 07:43 AM
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I am assuming your truck is a 1990 and not turbo, but on the turbo engines there is a flap just after the turbo that restricts the exhaust when the engine is under operating temp. When this flap is closed it makes what can sound like a sucking noise.
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Old 04-22-2010, 07:54 AM
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it is non turbo and it does it all the time it is kinda like an old train sound
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Old 04-22-2010, 08:22 AM
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I bet it's your air pump....
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Old 04-22-2010, 10:24 AM
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IDI's dont have EBPV's. As far as air pump, are you refering to the vacuum pump? If its wooshing you would have decreased braking performance, I would think he would post something about that?

I crack the injector lines one at a time to see if a injector is making the noise. If you crack it and the engine starts to idle rough, and the noise is still there, its not that injector, and move on. I would also want to pull the valve covers and check all the rockers, might be a exhaust valve problem of some sort.
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Old 04-22-2010, 10:35 AM
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Yes, sorry I meant vacuum pump
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Old 04-24-2010, 08:35 PM
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so today i took off the valve cover and all the vavles seem to be good as well as the springs. i dont think it is the injectors because it runs and starts great.
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