Strange hissing sound/ turbo would spool up - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 05-14-2013, 12:45 PM Thread Starter
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Strange hissing sound/ turbo would spool up

Hey yall it seems im asking something new every day.. so on my automatic 01 7.3 6 pos TS chip 124,7xx ATS turbo shroud/ intake, I was driving to work and heard this strange sound.. the only way to describe it is a deep hissing sound. I also noticed that I wasn't getting any boost on my guage. I couldn't find time to check it out during work so a buddy of mine looked at it and said its probly the inter cooler cupler or even worse my inter cooler could be cracked. He's not a big diesel guy so I don't know how accurate he would be. I drove home and it seemed ok. Also, this morning I was letting it warm up before I went to work and it was making the sound but not when it was warming up when I left work.. any ideas? or things to check?
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post #2 of 12 Old 05-14-2013, 12:51 PM
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Honestly - depending on how cold it is was where you're at or when you're starting, it's probably just the Exhaust Back Pressure Valve (EBPV) doing it's thing.
It's designed to do this to help warm up the engine when its colder out. Once the oil temp is up to 100degrees, and a couple other items - it will stop.
in other words - it's likely a non-issue. Once it warms up (spring/summer) it shouldn't really do it all.



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post #3 of 12 Old 05-14-2013, 01:07 PM Thread Starter
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Originally Posted by AzPatMan View Post
Honestly - depending on how cold it is was where you're at or when you're starting, it's probably just the Exhaust Back Pressure Valve (EBPV) doing it's thing.
It's designed to do this to help warm up the engine when its colder out. Once the oil temp is up to 100degrees, and a couple other items - it will stop.
in other words - it's likely a non-issue. Once it warms up (spring/summer) it shouldn't really do it all.
Ok. It was around 32* this morning and thats the coldest its been since I bought the truck. but by the time I was getting close to work it was still doing it and the engine was completely warmed up. I would think that would make a difference. Thanks for the info
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post #4 of 12 Old 05-14-2013, 01:41 PM
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it closes on ambiant air temp not coolant/engine temp...mine will do it (I belive its the spec too) untill 33-35. if all else look at vid's of the ebpv and see if it simillar. also search for a leak tester to test inter cooler.

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post #5 of 12 Old 05-14-2013, 01:53 PM
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Was it making this noise while pressing down on the throttle or only while the vehicle was not moving?

The EBPV will open the second you apply any throttle. I can manually turn mine on and off and even if i leave mine on it shuts off once i press the throttle down even a fraction of an inch.

If you were driving and not getting any boost that dont seem right.
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post #6 of 12 Old 05-14-2013, 02:27 PM
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Originally Posted by CarportMechanic View Post
Was it making this noise while pressing down on the throttle or only while the vehicle was not moving?

The EBPV will open the second you apply any throttle. I can manually turn mine on and off and even if i leave mine on it shuts off once i press the throttle down even a fraction of an inch.

If you were driving and not getting any boost that dont seem right.
It will disable entirely if you press the brakes.
But yes, even at ~30degrees, and driving down the road (and highway) it will do it if there is very minimal load on the engine.
It does it does to me when I do a cold start in the winter leaving work and travelling down the freeway at 60mph, once i hit the straightaway stretch and have no load - it opens the EPBV, and drops the boost and hiss's like crazy.
But once it's all warmed up - it'll stop. So what you're seeing makes total sense.

But once the air intake is above 70 or 80 degrees and oil temp is over 100 - it'll stop.
I found a thread that had all the specs that will trigger it, and then when it will stop.



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post #7 of 12 Old 05-14-2013, 05:52 PM Thread Starter
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It did it when it was in park with no pressure on the throttle and it did it while I was driving. I didn't punch the throttle but I was accelorating. It would do it while i accelorated from a stop and then quit. then it did it again. it seems that it would only hiss/ no boost when I didnt have a lot of pressure on the throttle.
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post #8 of 12 Old 05-14-2013, 05:56 PM Thread Starter
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Originally Posted by AzPatMan View Post
It will disable entirely if you press the brakes.
But yes, even at ~30degrees, and driving down the road (and highway) it will do it if there is very minimal load on the engine..
I found a thread that had all the specs that will trigger it, and then when it will stop.
Come to think of it, i think it did quit once i braked. cant quite remember though
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post #9 of 12 Old 05-14-2013, 07:06 PM
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yea - if you're in park, press the brake.
It will stay off at idle for about 2 mins - and if you're still in park, idling - it will do it again until it's warmed up.



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post #10 of 12 Old 05-15-2013, 05:23 PM
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Been there done that.Mine would do it driving down the road,full throttle or not.Hitting brake wouldnt even shut it off.Gradually got worse until it constantly was hissing.Look behind you going down the road when it hisses,it probably blows a lot of black smoke.No power too.I unplugged the ebpv sensor and havent had a problem since.Wont hurt any just may take a little longer to warm up.But I have high idle on my chip so no biggie.Plug is right in the middle of your turbo pedestal,right behind your fuel bowl.Unplug it and just let it hang and see if it goes away.
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