W204 2010 C200 CDI Loss of power after injector seal change (No fault/error codes)

iDevonik

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Hi, I just had my injector seals changed (due to seeing a leak on my drive and my mechanic diagnosing it to be that) and now my car has a drastic loss of power. Before the injector seal change the cars power fine - engine spools up properly and boost wasn't an issue.

When driving the car doesn't accelerate as it should - like it is in limp mode although on diagnostic tools and my Xentry software I get no error codes (no EML light as well). The dash shows the gear to be in D and doesn't change (usually says which gear you are in even if it is in comfort or sport mode). The gearbox is hesitant to change gears, and is jerky when it does so. If it manages to change into third gear even when flat out on the gas pedal there is no difference, meaning I have to change down a gear manually.

If I go into manual mode, I can change gears but if I switch back into comfort or sport the gear won't automatically change to what it should be. If I'm driving downhill the car performs like normal (acceleration, gear changes although not as smooth as usual) but if I hit an incline the car can't accelerate or change gear. I have also done a transmission adaption reset, it has helped slightly but the acceleration from low gears is still bad.

I have seen that the car has only one stored fault code (but wasn't active and occurred only once on the count) - P226300 "The boost pressure deviates from the specified value. __" but no others.

The mechanic also told me the turbo actuator seems ok and the car idles as it should (no misfires, smoke coming out of exhaust etc)

I have no history of the transmission being serviced too if that could be at fault - also to note I had to change the belt tensioner a few days ago too.

My engine is the OM651 and it's paired with the 5 speed automatic transmission. The car is roughly on 81k.


TIA
 
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alexanderfoti

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Have you read codes in all modules?

Even though there are no codes, have you santiy checked all connections in the engine bay?

I have had cars that go into limp mode with no codes, only to find out the problem is simple, and somebody has fiddled with the ecu software and deleted error codes.
 
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iDevonik

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Have you read codes in all modules?

Even though there are no codes, have you santiy checked all connections in the engine bay?

I have had cars that go into limp mode with no codes, only to find out the problem is simple, and somebody has fiddled with the ecu software and deleted error codes.
Yes, all is fine excluding faults I already new about (door actuators, a/c)

Also to note - the car had a DPF delete remap done to it too. It previously had a dpf remap but I was having issues a few days later with it (also the EGTs were high at the time) so had the "tuner" map it out.

I've had that map for the last 3 months/2k miles and its been fine. Although I was looking at having it mapped again from a proper tuner soon before this problem lol
 

alexanderfoti

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Yes, all is fine excluding faults I already new about (door actuators, a/c)

Also to note - the car had a DPF delete remap done to it too. It previously had a dpf remap but I was having issues a few days later with it (also the EGTs were high at the time) so had the "tuner" map it out.

I've had that map for the last 3 months/2k miles and its been fine. Although I was looking at having it mapped again from a proper tuner soon before this problem lol
Is the DPF still installed?

Wouldn't put it past the "tuner" to have removed codes. Put it back to standard and check it again
 
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iDevonik

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Is the DPF still installed?

Wouldn't put it past the "tuner" to have removed codes. Put it back to standard and check it again
I had it deleted by a mechanic - although he said he drilled some holes to make it quieter so I'm not sure if it was completely removed

Also like to add I didn't delete the EGR.
 

alexanderfoti

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DPF likely clogged, exhaust back pressure will trigger a soft limp with no codes quite often.

In any case, put it back to stock and check it again
 
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iDevonik

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DPF likely clogged, exhaust back pressure will trigger a soft limp with no codes quite often.

In any case, put it back to stock and check it again
If that's the issue - how come it's happened after such a long time and specifically after I had this job done. Is there any way I can see if it was properly deleted on vediamo/xentry?
 

alexanderfoti

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If that's the issue - how come it's happened after such a long time and specifically after I had this job done. Is there any way I can see if it was properly deleted on vediamo/xentry?
Coincidence

The DPF is slowly filling up. 2k is about right for it to be a restriction.

No, deleted DTCs aren't visible via vediamo.
 
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iDevonik

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Coincidence

The DPF is slowly filling up. 2k is about right for it to be a restriction.

No, deleted DTCs aren't visible via vediamo.
So would I still be able to access the DPF settings on Xentry? because I remember few weeks back I could still see all the fill/empty etc values - haven't checked after this fault though
 

alexanderfoti

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You also cannot apply that logic to mechanical things.

Eg, it was fine before and why is to broken now?

Its been fiddled with, software of unknown origin flashed to it and its still a mechanical thing that is having miles added to it and things are always changing.

If its had a problem caused by the recent work, but the problem is not readily apparent because the codes have been removed from the ecu, then you cannot attribute the fault with one event. It's an accumulation of events.
 

alexanderfoti

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So would I still be able to access the DPF settings on Xentry? because I remember few weeks back I could still see all the fill/empty etc values - haven't checked after this fault though
Yes
 
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iDevonik

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You also cannot apply that logic to mechanical things.

Eg, it was fine before and why is to broken now?

Its been fiddled with, software of unknown origin flashed to it and its still a mechanical thing that is having miles added to it and things are always changing.

If its had a problem caused by the recent work, but the problem is not readily apparent because the codes have been removed from the ecu, then you cannot attribute the fault with one event. It's an accumulation of events.
These were the codes when I had the DPF issues - I used to go into limp mode whenever I put my foot down. Do you think he deleted all these codes in the remap?
 

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alexanderfoti

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The leak it mentions is in the exhaust before the DPF, not related to the injectors.
In any case, put it back to stock and check it again

Yes I do
 

alexanderfoti

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The original reason for your DPF fault appears to be a fault differential pressure sensor. £65 to sort!
 
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iDevonik

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The original reason for your DPF fault appears to be a fault differential pressure sensor. £65 to sort!
I changed the sensor a few months beforehand with an OEM replacement, so was confused why it shot up that fault again. Since it was within 7 days of the remap he deleted it.
 
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iDevonik

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So do you think this is a software related fault rather than a mechanical? I was thinking in getting my injectors tested and cleaned on monday
 

alexanderfoti

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Then bad plug or wiring to the sensor
 

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ahhhh another DPF removal popcorn thread
 

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