f350 7.3 intake thump?? help please - Ford Powerstroke Diesel Forum
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Old 02-09-2014, 11:40 PM
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f350 7.3 intake thump?? help please

I posted about this a little while ago I have a update on it maybe will clear things up and narrow stuff down with the intake thumping popping noise . Changed the oil in the truck she was kinda low not burning it leaks a little, but added new oil new filter been adding fuel stabalizer Lucas Oil stuff Ok well when the trucks cold after sitting all night fire it up no popping from intake drives runs great till it gets pretty warmed up the popping kinds comes back but it's rarely every so often only when it idles down to a stop light or somthing and to make it go away if u get on the throttle the noise goes away next time you come to a light but keep in mind if u hit a certain rpm and are just coasting say at 45 mph u can hear It but if u let off it goes away. It's a 1995 f350 7.3 with 260k on it stage 2 afe intake. Before I did the oil change burned some tanks of fuel with the stabalizer in it it definitely did it more I have a video of it before the oil change on my other post it's driving me crazy not knowing what it is
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Old 02-09-2014, 11:44 PM
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Keep In mind tho I am in the marines I don't have the money to be running to shops in a town I don't really know. Believe me if I knew the area better this would have been taken care of
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Old 02-10-2014, 11:29 AM
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If it started after you used the fuel treatment, I would stop using that ans switch to powerservice in the white bottle, use the gray bottle if you are in a warm climate.

I am not going to look for the video, will you embed it here or post the link where we can hear it?
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Old 02-10-2014, 11:32 AM
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The fuel treatment seemed to help clear It up it did It worse before oil change and a few tanks of fuel stabalizer but still does it
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Old 02-10-2014, 11:36 AM
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I dont hear anything out of normal, but its hard to tell in the vid...
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Old 02-10-2014, 11:41 AM
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It's the whump whump noise
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Old 02-10-2014, 06:02 PM
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I think I posted this before, but the only time I've read about a whump whump from the airbox is due to a bent pushrod (or other valvetrain issues). have you run it with the valvecovers off to see how things are moving under there? Cheers!
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Old 02-10-2014, 06:11 PM
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I haven't yet what would I be looking for and also should I replace the valve cover gasket what's the typical shop cost for maybe bent push rod or broken rocker arm
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Old 02-10-2014, 06:16 PM
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Couldn't help you on the shop cost. I would just look for something in one of the pushrods or rockers that doesn't look like the rest while running (having never experienced the problem myself). You would only need to replace the gaskets if any of the external or internal connection pins are burned/melted. Cheers!
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Old 02-10-2014, 06:20 PM
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I'll see what I can do like I said tho weird part it is only prone to doing it when warm
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