Pinging Sound After Exhaust Brake Install
Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
Pinging Sound After Exhaust Brake Install
I'm getting a pinging sound that is not ignorable. If I could explain the sound, it sounds like a speck of water hitting a pan full of hot oil. It seems to be in time with rpm, but not too consistent in its frequency. It gets louder under load. It doesn't make the sound while the engine is cold. It starts right as the exhaust temp comes up to operating temp. I've used a stethoscope to no avail. It's hard to hear where the sound is coming from, but it seems like it's coming from the head area on both sides. Hopefully someone can help me pin point it.
Background: I just bought this truck. The sound appeared immediately after I installed and setup a BD exhaust brake. While setting up the exhaust brake, I didn't realize there was ice in the line to the pressure meter I was using, and I think the exhaust back pressure got up to 40psi while the truck was idling. I hope it didn't go over 45 psi, but I don't think it did. I wouldn't have thought this would cause a problem though. The first thing I did was test compression, which is great across the board. I ended up replacing springs (910-16), arms, and push rods while I was in there. The valves felt like they seat well when moving them up and down and they spun smoothly in the guides. The sound is still there...
At this point I suspect there is an exhaust leak between the engine and the turbo, but I can't see anything that would make noise. My thinking is this newly increased exhaust backpressure blew open an exhaust leak. The connection between the manifold and the up pipe is a little bit leaky, but not too bad. I'll try to tighten those to see if it helps, but I don't think it will. I don't see any evidence of leaking between the engine and the manifold, but it's hard to see in there. The exhaust back pressure sensor at the front of the passenger manifold is deleted, and the plug filling the hole looks tight as a drum. I have a ford manifold gasket in hand if it comes to that, but It's not a job I want to do if I'm not pretty sure that's the problem.
Truck is a 99 f350 with a 7.3. Bellowed up pipes.
Any ideas?
Thanks,
Doug
Background: I just bought this truck. The sound appeared immediately after I installed and setup a BD exhaust brake. While setting up the exhaust brake, I didn't realize there was ice in the line to the pressure meter I was using, and I think the exhaust back pressure got up to 40psi while the truck was idling. I hope it didn't go over 45 psi, but I don't think it did. I wouldn't have thought this would cause a problem though. The first thing I did was test compression, which is great across the board. I ended up replacing springs (910-16), arms, and push rods while I was in there. The valves felt like they seat well when moving them up and down and they spun smoothly in the guides. The sound is still there...
At this point I suspect there is an exhaust leak between the engine and the turbo, but I can't see anything that would make noise. My thinking is this newly increased exhaust backpressure blew open an exhaust leak. The connection between the manifold and the up pipe is a little bit leaky, but not too bad. I'll try to tighten those to see if it helps, but I don't think it will. I don't see any evidence of leaking between the engine and the manifold, but it's hard to see in there. The exhaust back pressure sensor at the front of the passenger manifold is deleted, and the plug filling the hole looks tight as a drum. I have a ford manifold gasket in hand if it comes to that, but It's not a job I want to do if I'm not pretty sure that's the problem.
Truck is a 99 f350 with a 7.3. Bellowed up pipes.
Any ideas?
Thanks,
Doug
Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
I'll do that. It just seems like such a small leak I didn't think it could be causing the noise. I'll post back. Thanks.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Exhaust leaks will cause a ticking noise, at least they did for me.
You can feel around for exhaust leaks on a cold startup. They can be tricky to find.
KC Turbos recommends powerbraking (but keeping it from spinning) in a hot tune while someone watches for smoke.
I’m not familiar with the exhaust brake but is it possible you’re hearing the flapper bounce around?
You can feel around for exhaust leaks on a cold startup. They can be tricky to find.
KC Turbos recommends powerbraking (but keeping it from spinning) in a hot tune while someone watches for smoke.
I’m not familiar with the exhaust brake but is it possible you’re hearing the flapper bounce around?
Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
Feeling around during a cold start is a good idea. Unfortunately, it only starts to make the sound once it's up to temp, so it wouldn't be too conclusive.
Pulling the manifold actually doesn't seem too bad. I just hate guessing when it's a time intensive guess.
I think I'm going to put it back together enough to take it to a mechanic who's heard more sounds than I have.
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CNCFAB
Joined: Apr 2020
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Did the sound start just after your injector install? Was all the work at the same time? What injectors did you install?
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Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
It started before I messed with the injectors. I removed the back 4 injectors to make spring replacement easier. Not saying it's not an injector problem, but I don't think it's because I messed with them.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
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From: Elk Grove, CA
The truck needs a working EBPS to calculate fuel properly. I'd replace the tube if rusted out and the sensor.
Take a video with your phone so we can hear the sound. If the sound is on both sides move the phone to capture that.
How long since the bellowed uppies were installed? Sure the collector to turbo is mated properly?
Take a video with your phone so we can hear the sound. If the sound is on both sides move the phone to capture that.
How long since the bellowed uppies were installed? Sure the collector to turbo is mated properly?
Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
Are you alone while troubleshooting?
https://youtube.com/shorts/LONT1oboJrs?feature=share
https://youtube.com/shorts/LONT1oboJrs?feature=share
Thread Starter
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5th Wheeling
Joined: Jun 2016
Posts: 28
Likes: 2
The truck needs a working EBPS to calculate fuel properly. I'd replace the tube if rusted out and the sensor.
Take a video with your phone so we can hear the sound. If the sound is on both sides move the phone to capture that.
How long since the bellowed uppies were installed? Sure the collector to turbo is mated properly?
Take a video with your phone so we can hear the sound. If the sound is on both sides move the phone to capture that.
How long since the bellowed uppies were installed? Sure the collector to turbo is mated properly?
The uppipes were installed by the prior owner. It's possible the connection to the back of the turbo has come loose, but I don't suspect that. The uppipe was installed well before the sound started if that's what you're getting at. My primary suspicion is still that introducing high exhaust back pressure that the exhaust system has never seen before has caused a leak to form. I'm just not seeing a leak though. I'll mess around with the exhaust this weekend to get a better look at it.
I'll try to take a video tonight.
Thanks for the help.