Is the turbo supposed to sound weird? - Diesel Forum - TheDieselStop.com
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 6 (permalink) Old 10-15-2019, 03:01 PM Thread Starter
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Is the turbo supposed to sound weird?

Since mine has the delete pipe on it, there is nothing restricting the exhaust sounds. When I start it, I hear the normal turbo spool sound, but as it idles it makes a weird sucking sound. It has been years since I had my 7.3, and I sort of recall it making a sound other than the whine at idle when cold, but nothing like this. Is it supposed to do this?


It kind of sounds like a shop vac with a piece of paper stuck in it.

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post #2 of 6 (permalink) Old 10-16-2019, 01:42 PM
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I'm betting the VGT side of the turbo is cycling. Once they warm up to operating temps it's not going to be as bad compared to a cold start.

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post #3 of 6 (permalink) Old 10-16-2019, 01:45 PM Thread Starter
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I'm betting the VGT side of the turbo is cycling. Once they warm up to operating temps it's not going to be as bad compared to a cold start.



I only hear it on start up. Of course now I have to go look up what VGT is. LOL Let me guess though, variable vanes inside the housing to increase/decrease spool speed.
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DD 2018 F150 Platinum 3.5 EB
Tow Baby, 2012 F350 King Ranch SRW SB. Rolling Thunder III
Sold due to neglect
U.S.N. Paradise BB91904 '99 F350 CC LWB DRW
Mods, SuperHyper Improbability drive stage II.
Hypermax 5" turbo back system, triple pillar guages, Heater core shutoff. AEM Brute Force intake. 3.73 gearing. DP PCM with 80HP Installed!
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post #4 of 6 (permalink) Old 10-16-2019, 01:53 PM Thread Starter
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Ahh, Now I understand. Also explains the 1-2 upshift and funky sound.


Nice explanation.

DD 2018 F150 Platinum 3.5 EB
Tow Baby, 2012 F350 King Ranch SRW SB. Rolling Thunder III
Sold due to neglect
U.S.N. Paradise BB91904 '99 F350 CC LWB DRW
Mods, SuperHyper Improbability drive stage II.
Hypermax 5" turbo back system, triple pillar guages, Heater core shutoff. AEM Brute Force intake. 3.73 gearing. DP PCM with 80HP Installed!
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post #5 of 6 (permalink) Old 10-16-2019, 02:03 PM
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Gals Banks has a video I like (for reference only) that shows/shares the same info.

I'm thinking Ford has used this in the PCM tuning to help with motor warm-up since it tends to go away once up to operating temps.

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post #6 of 6 (permalink) Old 10-16-2019, 02:14 PM Thread Starter
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I remember my 99 making different sounds when warming up on really cold days. You could hear the turbo spooling up/down, but didn't make the weird gargling noise the new one does, but now that I know why the turbo makes that noise, I'm ok with it now. Now if I can just figure out that other weird beeping noise it makes when not running.

DD 2018 F150 Platinum 3.5 EB
Tow Baby, 2012 F350 King Ranch SRW SB. Rolling Thunder III
Sold due to neglect
U.S.N. Paradise BB91904 '99 F350 CC LWB DRW
Mods, SuperHyper Improbability drive stage II.
Hypermax 5" turbo back system, triple pillar guages, Heater core shutoff. AEM Brute Force intake. 3.73 gearing. DP PCM with 80HP Installed!
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