Exhaust leak? And icp pressure - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 06-30-2019, 06:52 PM Thread Starter
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Exhaust leak? And icp pressure

Just finished up a head gasket job and the engine runs smooth, but has this very loud noise. Is it an exhaust leak? Visually everything was very well aligned when I assembled it but who knows...

Truck builds boost after you get some momentum but is slow on the get go..

https://youtu.be/JKZey5yb4wE

Should this noise be coming from the manifolds to y-pipe connections? Those were harder to tighten, space is so constricted....

Also, itís been only a few starts but the truck takes 2-3 seconds to build up icp before starting. I replaced standpipes and dummy plugs and apparently the seals on the top of the injectors were good so I didnít touch them.




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Last edited by GusCO; 06-30-2019 at 07:03 PM.
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post #2 of 8 Old 06-30-2019, 07:35 PM
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It sounds like your up pipe to turbo joint is not seated correctly. Mine sounded like that when I was playing musical turbos and I didn't get the up pipe and turbo aligned correctly. Unfortunately you can not just look at see if its good or not, or at least I can't lol. Check your clamps also to make sure they are not bad. I don't know how you did your exhaust, but when I do mine I leave the manifold to up pipe bolts loose, I then install the up pipe to turbo and clamp and tighten them down tight, then I go and tighten the manifold to up pipes. I also loosen the turbo bolts to help align the up pipe to turbo, and tighten them back down after the up pipe clamp is tightened.
I hope that ain't to confusing.
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post #3 of 8 Old 06-30-2019, 07:55 PM Thread Starter
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Not confusing... Exactly what I did! And apparently what Iíll be doing again... :/

I was surprised by how loud it is! Actually hurtful.

At first there was no noise. It makes sense that vibration took it out of alignment... probably I didnít tighten one of hem properly...


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post #4 of 8 Old 07-04-2019, 01:01 PM Thread Starter
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So I just had the time to go take another look. The noise goes off completely and instantly when I disconnect the vgt solenoid. Does this tips into anything in special?

With the truck cold I couldnít feel any exhaust leaking with my bare hands...


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post #5 of 8 Old 07-05-2019, 12:16 PM
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Quote:
Originally Posted by GusCO View Post
So I just had the time to go take another look. The noise goes off completely and instantly when I disconnect the vgt solenoid. Does this tips into anything in special?

With the truck cold I couldn’t feel any exhaust leaking with my bare hands...


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Of course it would, with the vgt disconnected the vanes open, allowing the exhaust to pass easier. With more resistance it would be noisier.

2-3 seconds for the ICP to build for a start is normal. As you bleed more air, or for a subsequent start the time may drop to a second or two.

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post #6 of 8 Old 07-08-2019, 08:57 AM Thread Starter
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Got it. Thanks.

So this weekend I decided to do a smoke test and find the leak. I couldn't believe the turbo was leaking. It was too loud and obnoxious. And I payed a lot of attention when assembling it. And it wasn't the turbo indeed! It turns out I didn't pay attention at all to the EGR cooler. That band was totally loose. Fortunately it was accessible from the top of the engine. Tightened it and I'm golden!


Also the ICP build up as twoicebergs say is getting shorter and shorter with time. now if I just turned the truck off and on again it is intant. If the truck sat for a few days it's building pressure in a second or 2.

Last edited by GusCO; 07-08-2019 at 09:08 AM.
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post #7 of 8 Old 07-08-2019, 02:35 PM
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Exhaust leaks can be noisy and kill performance. I know you already found it but for anyone else trying to fix similar issues, here are some great videos.

Finding exhaust leaks


Fixing exhaust leaks

KC Turbos
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Current Setup 190/30 and KC 64mm Stage 2 turbo
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post #8 of 8 Old 07-09-2019, 10:11 AM Thread Starter
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^^ Good deal! I had watched your videos to help install my turbo the first time.
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