Loud loping noise when cold outside - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 11-12-2019, 06:28 PM Thread Starter
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Loud loping noise when cold outside

When its cold outside (40 degrees F and below) this loud loping noise, like you just cammed this baby up lol, begins at 1000 RPM and continues to 1500 RPM. If you accelerate it will stop but once you let off and hold the throttle steady it begins again. It reminds me of an exhaust brake sound. I lose about 200 RPM while its doing this and you can feel the power loss. You can hear a slight air whistle noise almost like a vacuum leak just before the loping begins. I have tried to listen and hear whats going on and the loping sound sounds like it is coming through the cold air intake. I have no idea what this is or if it is normal for the 7.3's. First 7.3 I have owned. Any help would be appreciated!!! Thanks!!!
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post #2 of 6 Old 11-12-2019, 06:56 PM
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Itís your Exhaust Back Pressure Valve. Itís kind of like an exhaust brake just after the turbo thatís controlled from the PCM. Completely normal for it to actuate like that. And yes you will here it from the cold air intake


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post #3 of 6 Old 11-13-2019, 03:34 AM
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X2 EBPV.

I used to have to let mine warm up a little then turn it off and back on for it to fully open.

It has since been gutted. Some people like to leave it since it is factory installed but with todays winter blend fuels the motor will still warm up just fine without it.
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post #4 of 6 Old 11-13-2019, 08:20 AM Thread Starter
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Thank you very the knowledge. That’s what I have done a few times is let it warm up then shut the engine off and start it again and then works properly but here lately that hasn’t been working. Is it something that can be cleaned?
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post #5 of 6 Old 11-14-2019, 07:20 AM
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The pcm has to see a specified oil temp before it opens (don't remember the actual temp). Even though you're shutting it off and turning it back on, the engine still may not be warm enough to deactivate it. Or it could be sticking.

It can be serviced, but, as said, if you take it apart you might as well gut it. The rod can stick and the o-ring can go bad causing an oil leak that would be visible on the turbo pedestal.

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post #6 of 6 Old 11-14-2019, 09:03 AM
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Honestly the first time you take the turbo off you will want a deleted pedestal.

It took me 4hrs to get mine off and 30 minutes to put it back on with a deleted pedestal. No more leaks and no more worries.
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