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Old 09-19-2019, 10:39 AM   #1
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Engine sound

Hi . I'm looking for a bit of technical help . I have a 2015 ford focus 1.5tdci and put a diesel st exhaust from dpf back .
Now I have this problem where once I've been driving a bit the exhaust sound changed and sounds like it's blowing but it isn't
Then the sound dissapears and goes back to normal .
I've checked all joints and they seem fine .
Has anyone else come across this at all ?

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Old 09-19-2019, 04:16 PM   #2
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Possibly your hearing the regen exhaust more since you swapped out the exhaust...
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Old 09-20-2019, 01:25 AM   #3
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Cheers for that . Would I hear that every time I drive it ? Thought that only happened every time the soot content reached a certain level .

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Old 09-20-2019, 10:20 AM   #4
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Cheers for that . Would I hear that every time I drive it ? Thought that only happened every time the soot content reached a certain level .

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What was it doing before you swapped out the exhaust?
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Old 09-20-2019, 10:23 AM   #5
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It was fine to be honest. I think I see about the dpf now.
If the back pressure is wrong causing the dpf pressure sensor to think it is blocking I suppose it could be doing a regen to try and bring it down .?

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Old Yesterday, 11:03 AM   #6
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Removed the st rear silencer and put back the original silencer and stopped the problem . All better now .

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Old Yesterday, 11:30 AM   #7
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Great you figured it out....when Ford spent millions of dollars on engineering & your redoing what Ford did.......LOL
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Old Yesterday, 01:10 PM   #8
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Haha . Yea I learn by my mistakes .

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Old Today, 09:57 AM   #9
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Haha . Yea I learn by my mistakes .

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Possibly should have stepped up to a ST to begin with.........
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Old Today, 11:08 AM   #10
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A turbo diesel focus? I'm kinda jealous, it sounds like a funner car than a normal gasoline focus (minus all the diesel emissions stuff.)
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