04 6.0L F350 backfire thru intake on hills - Ford Powerstroke Diesel Forum
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Old 09-30-2009, 06:51 PM
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Question 04 6.0L F350 backfire thru intake on hills

Been hearing a backfire through the intake while going up hills. Typically it will make the sound 2-4 times then clear out and be fine. Last week it backfired the entire way up a long grade (a good 45 seconds) and didn't clear out until i crested the hill. Didn't seem to matter if i gave it more throttle or backed off. MAP sensor?
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Old 09-30-2009, 07:20 PM
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possibly loose or broken rocker arm/bent valve stem

We fixed one just yesterday that #8 cylinder had a rocker arm that was loose and got bent, keeping the intake valve slightly open all the time.
Listen at each valve cover for an exsessivly loud clatter, then remove that cover and check. You can use a stethascope or a large srew driver or dowel rod. Anything that can transmit sound/vibration.
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Old 10-02-2009, 10:38 AM
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I've got one doing the same thing, 2004 6.0, but it only does it while pulling my loaded trailer. If my problem was also and intake valve, would it do it while driving the truck by itself without a load? I have never be able to get it to do it without the trailer hooked up.
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Old 10-02-2009, 01:58 PM
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My truck does it as well. I Changed my air filter and cleaned the MAF sensor with brake clean. Put it all back together and it didn't "backfire" through the intake for a day then it started back up again...??? I wouldn't say your problem is rocker arm/pushrod related...sounds like we have the same problems....??????
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Old 10-03-2009, 10:47 AM
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Is it backfiring or is it "turbo fart"? If its turbo fart, your turbo veins could be sticking and causing over-boosting. Does it do it when you let off the throttle quickly under load?
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Old 03-16-2010, 11:28 AM
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Sorry to dig up an old post but I am having the same issues while towing up hill (7000lbs). I am guessing my turbo veins are crapped up as well.

Did anyone solve their issue (outside of the bent rocker arm)?
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Old 03-16-2010, 09:32 PM
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mine was doinig the same thing when ever i was towing anything up hills and it ended up being the EGR
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Old 03-18-2010, 09:20 AM
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Can someone please make a video of this happening and post it on youtube? I may help to narrow down the possibilities and clear up some confusion and aide in diagnosis.

Thanks!
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