TDCI surging under full throttle - sticky vanes? [with logs] - Diesel Engines (Mk4 Mondeo) - TalkFord.com

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TDCI surging under full throttle - sticky vanes? [with logs]

tdci surging turbo vanes

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#1 grandaddy_low

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Posted 14 February 2020 - 09:44 AM

Hi,

 

Mondeo Mk4 and Galaxy Mk3.  Same engine in both, both surge on full throttle.  Feels like the turbo dumps the boost then recovers but then keeps doing that.  Never does it cold, only when the engine is hot.  The hotter the engine is, the worse it is.

 

- MAF cleaned.  No difference

- Vacuum supply pressure checked.

- Boost control solenoid replaced as it was a bit leaky.  Didn't make any difference.

 

Attached are some logs:

- cold pull - works fine

- warm pull - you can see the vane position voltage spike, then the MAF and MAP react afterwards.

- cruise - 70 on the motorway.  No noticeable surging.

 

I'm thinking clogged vanes, but they are a pain to get to, so before I get into that, is there anything else I should be looking at first?

 

Thanks GDL.

Attached Thumbnails

  • coldPull.PNG
  • warmPull.PNG
  • cruiseScreenshot.PNG


#2 riikomi

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Posted 14 February 2020 - 10:51 AM

There are quite a few who have 'repaired' their turbo using Mr Muscle oven cleaner...

 

https://www.youtube....h?v=56oIU-sF7d0



#3 grandaddy_low

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Posted 14 February 2020 - 11:01 AM

There are quite a few who have 'repaired' their turbo using Mr Muscle oven cleaner...

 

https://www.youtube....h?v=56oIU-sF7d0

 

I've been watching a few of them, but I wanted to be sure that was the issue I was looking at...



#4 HC56

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Posted 14 February 2020 - 07:55 PM

There are quite a few who have 'repaired' their turbo using Mr Muscle oven cleaner...

https://www.youtube....h?v=56oIU-sF7d0


I've been watching a few of them, but I wanted to be sure that was the issue I was looking at...
Just thinking out loud, intake air sensor?...


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#5 grandaddy_low

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Posted 14 February 2020 - 07:56 PM

As in MAF? Cleaned already... but not replaced.

#6 HC56

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Posted 14 February 2020 - 08:09 PM

As in MAF? Cleaned already... but not replaced.

No...air intake temperature sensor inside throttle body?

https://rover.ebay.c...tm/233398453166

If that link doesn’t work cut everything but the number after the percent icon...it’s the only way I can find you a picture



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#7 riikomi

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Posted 14 February 2020 - 08:13 PM

*
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IAT reading can be checked using Forscan. After a standstill overnight, it should show the ambient temperature.


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#8 grandaddy_low

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Posted 14 February 2020 - 08:15 PM

Right. I'll try it in the morning and post back. Thanks.

#9 HC56

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Posted 14 February 2020 - 08:18 PM

IAT reading can be checked using Forscan. After a standstill overnight, it should show the ambient temperature.

Didnt know the IAT Could be checked in Forscan...TY for that


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#10 grandaddy_low

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Posted 15 February 2020 - 10:05 AM

Hi,

 

Here are some screen grabs of IAT temp both with the engine running and stopped.  Both look about right for the outside temperature.

 

Thanks, GDL.

 

Off.PNG

 

On.PNG







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