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Lack of power without info

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Old Jun 29th, 2022, 07:52   #1
urban60
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Default Lack of power without info

My car goes into "limp" mode (poor acceleration, no turbo) only if I drive really fast and accelerate hard, but the weird part is that it won't show any visual indication - no messages, no red warning light, nothing... As soon as I turn off and turn the car on again, everything goes back to normal. This started to occur now at high outside temperatures (higher 20°C).

Any clues? Could that be a clogged up DPF? But if that's the case I should get some information on the screen?


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Old Jun 29th, 2022, 09:44   #2
wendash
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I had the same problem and it turned out to be the swirl flap arm had detached. I re-fitted it turned over by 180 degrees as the 'lobes' had worn and it has been fine ever since.
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Old Jun 29th, 2022, 09:52   #3
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Interesting. I'll take a look at it and come back with the results.
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Old Jun 30th, 2022, 00:25   #4
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I've had the exact same issue for some years. Accompanied by a chuf-chuf sound on lift off of the accelerator. It comes and goes, but in all cases power is restored either after a stop and restart, or overnight. My swirl flap linkage is intact, so not that.
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Old Jun 30th, 2022, 08:22   #5
urban60
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Yeah so my swirl flap linkage is also intact so no luck here... Any more ideas? ferg55 have you resolved your issue?
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Old Jun 30th, 2022, 09:26   #6
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Can also be the temperature sensor on the CAT or DPF - these sometimes fail intermittently - puts the car into a not well documents restricted power mode with no message or lights but wont rev past around 3,000 rpm. In this case a code will be logged, but Volvo compatible gear will be needed, generic OBD's report it as a vague message (e.g. temperature sensor Bank A).
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Old Jun 30th, 2022, 11:42   #7
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I understand your symptom. I'd second swirl flap actuator. May actually be worth giving the EGR a clean too, But turns out the linkage was disconnected because the linkage had jammed up.

The only other thing that hadn't been adressed when I bought the car was the EGR was chockers of soot.

Replacement of flaps (ebay) and an evening scraping powdered goo out of the EGR, stopped that issue outright.
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Old Jul 1st, 2022, 08:49   #8
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The other day I didn't have much time to really inspect the swirl flaps arm, but I did have it yesterday and it turns out this really is the case. The other day I only inspect it visually which seamed fine and it was in horizontal position so I assumed it was OK, but yesterday I saw it completely hanging down by the actuator. Assumption really is mother of all fups. Sorry about that and thanks everybody!
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Old Jul 1st, 2022, 10:30   #9
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Glad you got it sorted.
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Old Jul 2nd, 2022, 19:55   #10
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Good news, that. You've got a "how to" to fix them properly, up top.
Or just cable tie it on.
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