OM651 No power under 2500rpm - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 04-24-2019, 06:29 AM Thread Starter
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OM651 No power under 2500rpm

Hi!

I have a trouble with my c-class late 2010 (om651 170hp, 722.626) . When i drive away thereīs no power in the enginge untill i came to 2500rpm then it goes as it schould. After a restart the power will be back untill i hit the highway and the power dissapearīs again. I changed the vacuum transducer and looked after leak in the intercooler hooses. It started a few weeks ago but now it happens everyday.
Engine and gearbox goes into limphome and engine light comes on a few times (not every time). But after restart it goes properly again (untill i cruise at the highway)

Trouble codes :

p226300 - The boost pressure deviates from the specified value (CURRENT & STORED)
p00af92 - Boost pressure control "A" has a malfunction. The function or the instruction is faulty (STORED)
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post #2 of 5 (permalink) Old 04-24-2019, 06:19 PM
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Boost code calls for checking any leaks in the turbocharging system.
Usually they show as wet spot on the hoses or turbo.
How many km on the engine and turbo?


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post #3 of 5 (permalink) Old 04-24-2019, 09:34 PM Thread Starter
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The engine is dry so i Believe there's no leak. I changed both seals on the hose from the turbo to the intercooler cause it was wet. engine has now 350,000 km
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post #4 of 5 (permalink) Old 04-25-2019, 10:34 AM
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At this mileage the turbo might be worn.
Open inlet hose and check ply on the shaft and any damages.
Try to spin it and count the time to stop.


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post #5 of 5 (permalink) Old 04-25-2019, 10:56 AM Thread Starter
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Thanks for your advise, today i find the problem. It was the transducer underneth the egr cooler, i had only changed the transducer on the front of the enginge before.. the car runs great again 😁👌 i'm just curios, for how long time will the turbo spin if it's not damaged?
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