HELP! Why does my truck sound like this?????? - Ford Powerstroke Diesel Forum
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Old 04-21-2013, 06:41 PM
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HELP! Why does my truck sound like this??????

I recently straightpiped my '05 F250 and installed a set of 6" stacks. Ever since, it has sounded like the attached video! I thought it was a backpressure issue so removed the EBP sensor and tube and cleaned them, then replaced the sensor because the cleaning did not fix the problem. The new sensor didn't work , so I replaced the MAP sensor, and that STILL didn't work . Now I am thinking maybe it's a fuel pressure issue, so I am ordering the blue spring kit from Riff Raff Diesel, and picking up a fuel pressure gauge. The truck has a brand new Stage 1 (65mm) turbo and EGR delete kit, and the injectors were done about 2 years ago. The video shows a moderate acceleration from 0-60, and as you can see/hear the worst is in 2nd and 3rd gear. Once the truck is maintaining speed, the surging stops and it runs fine! It is also worse when the truck is cold vs. hot. Any opinions are greatly appreciated! I can't wait to get this problem fixed so I can install my Edge A2 monitor, and load up an SCT tune to wake this monster up!!!

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Old 04-21-2013, 06:51 PM
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Sounds to me like something is hitting metal but hard to tell.
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Old 04-21-2013, 07:24 PM
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what do you mean?
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Old 04-21-2013, 07:28 PM
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Like your exhaust is hitting something under a load. I don't know, the sound quality isn't the greatest in my end.
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Old 04-22-2013, 05:37 AM
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it'd surging under accelaration.
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Old 04-22-2013, 06:20 AM
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So you are telling us the EBP tube where it attaches to the manifold is in good condition with no leaks of any type. Have you also checked the hose to the MAP for cracks as well? What about the CAC boots and connections? If all is good then, you need to move to the fuel pressure, vgt solenoid, FICM and possibly an injector.

Why would you not install the monitor to help solve this problem? It can definitely help track down some better info to post. For example, a simple boost leak that purges at 20psi to 16psi would give this result. So would the turbo vanes hunting for position due to a loose connection. Do you have any hard or soft codes? Since you say cold is worse, it has me leaning more to an injector problem. If it skips an open/close cycle due to stiction, that would give a similar result, but it wouldn't be specific to acceleration, but due to the power applied it would be more noticeable.
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Old 04-22-2013, 02:38 PM
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Great, Frank! Thanks for the info... I will investigate further and repost with my findings
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Old 06-18-2013, 04:19 PM
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It looks/sounds like your RPM's are fluctuating, or is it you doing that? If that's the case then I'd rule out all of the "exhaust hitting something" posts, and start looking for a possible fuel or electrical issue. Otherwise, I'm just as lost as you
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