2012 M157 63 AMG problem, P2187 lean code bank1 at idle

Apr 11, 2023 | 03:57 PM

akhorbaladze

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2012 Mercedes-Benz CLS 63 AMG Performance package

2012 M157 63 AMG problem, P2187 lean code bank1 at idle

Hello, I have 2012 CLS 63 AMG, the engine is newly rebuilt, it throws P2187 (lean condition at idle bank 1), this problem also was before engine rebuilt, tried so many things list is below:
I speak english, russian and georgian, some of the texts in video are in russian and I can translate if needed

It throws P2187 (system too lean at idle bank 1)
with full engine rebuilt, changed so many details to fix this problem:
Tried 3 pairs of all the injectors
Tried 3 pairs of high pressure fuel pumps
Changed fuel pump - passenger side under back seat
Changed several pairs of O2 sensors, also swapped right to left
Changed ECU
Performed smoke test on the engine - no leak
Changed intake manifold
Changes spark plugs and Ignition coils (babina)
Changed exhaust manifold gaskets, they were leaking but - nothing changed
Trying to fix this problem for already 7 months, please help.
some additional symptoms: sometimes it takes about 10 seconds cranking and then starts the engine, sometimes it starts in a second,
on cold engine misfires are so bad and engine is shaking, (engine mounts are new)
when cold, when I try to put in D and start driving, car starts shaking and rev jumps up and down, (changed transmission clutch but no difference)

Apr 11, 2023 | 05:13 PM

PeterUbers

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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster

I copied your post into chat gpt AI and got this:

It sounds like you have tried a lot of things to fix the issue, but the lean condition at idle on bank 1 persists. Based on the information provided, there are a few more things that you could consider checking or testing:

Check for vacuum leaks: Even though you performed a smoke test and found no leaks, it's still possible that there could be a small leak that was missed. You can try spraying carburetor cleaner or brake cleaner around the intake manifold and vacuum hoses while the engine is running. If there is a leak, the engine idle will change as the cleaner is drawn in.
Check the fuel pressure regulator: A faulty fuel pressure regulator can cause a lean condition at idle. You can test the regulator by disconnecting the vacuum line while the engine is running. If fuel comes out of the vacuum line, the regulator is faulty and needs to be replaced.
Check the mass airflow sensor (MAF): A dirty or faulty MAF can also cause a lean condition. You can try cleaning the MAF with MAF cleaner, or try swapping it with a known good one to see if the problem goes away.
Check the crankshaft position sensor: A faulty crankshaft position sensor can cause hard starting and misfires, especially when the engine is cold.
Check for exhaust leaks: Even though you changed the exhaust manifold gaskets, there could still be a leak in the exhaust system that is causing the lean condition.
Check the fuel quality: Poor quality fuel or water in the fuel can also cause a lean condition. You can try using a fuel additive to clean the fuel system and see if the problem improves.

If none of the above suggestions work, it may be worth taking the car to a qualified mechanic who can perform more advanced diagnostic tests to pinpoint the problem.

Apr 11, 2023 | 06:04 PM

Baltistyle

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From: Baltimore County, MD

'13 s212 63 p30. '06 LX470

Oh no Peter, have you been Ai this whole time

I did not see the CPS and Magnets or harness mentioned by the op. Oil in harness can create lots of issues.

I would assume this issue has been checked for?

Also, when you mention that it is rebuilt, how in depth do you mean, only the items mentioned or inside the engine as well such as heads or timing, valves, etc?

Are you using mercedes Star to diagnose?

and are you using a stock intake and filters for diagnosis?

Last edited by Baltistyle; Apr 11, 2023 at 06:11 PM.

Apr 11, 2023 | 07:13 PM

akhorbaladze

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2012 Mercedes-Benz CLS 63 AMG Performance package

I changed all cam sensors and they are working(didn't check magnets, but mechanic have removed it several times), also changed engine wiring but nothing changed, didn't change pistons, changed connecting rods which were bent, also changed 1 camshaft and also crankshaft, (they were bad), last but not least also changed cylinder heads (including valves), because compressions were not consistent, one side had 15 bars (about 200psi) and another 11 bars(about 160 psi), after final rebuilt we measured compressions in all cylinders before putting engine in the car and it was 12 for all 8 cylinders.
the current diagnostic tool is not a star its just normal obd2 which connects by phone, but also performed checks many times on star and no much other info (I mean what technitians tell me, since I am not a mechanic) hope I had a star

could diagnose better.
I changed intake manifold with also new map sensor, but nothing changed.
I am using K&N performance filters, cleaned them and nothing changed, also swapped sides and nothing changed.

Apr 11, 2023 | 07:19 PM

akhorbaladze

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2012 Mercedes-Benz CLS 63 AMG Performance package

I have a question about this:

Quote:

Check the fuel pressure regulator: A faulty fuel pressure regulator can cause a lean condition at idle. You can test the regulator by disconnecting the vacuum line while the engine is running. If fuel comes out of the vacuum line, the regulator is faulty and needs to be replaced.

Where is the regulator located in this car? (is it also known as high pressure pump? (on the passenger side engine), or behind the driver back seat?
also which vacuum line to disconnect and check?

Apr 11, 2023 | 07:20 PM

Baltistyle

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From: Baltimore County, MD

'13 s212 63 p30. '06 LX470

There’s threads with multiple car models throwing this code with K and N. Might be worth a try. If all other items are installed positively correctly. Smoke test on engine including intake side? It’s either getting extra air from somewhere or mistakenly reading it.

what was the cause of the original bent rods? injector stick? Do you think the ce light contributed to that fail?

Apr 12, 2023 | 02:42 PM

akhorbaladze

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2012 Mercedes-Benz CLS 63 AMG Performance package

We performed smoke test on metal tube coming out of filter box, no idea why rods were bent, the engine had also bent crankshaft and broken flywheel, also timing belt was bad... is there any chance that it can be fuel valve (located back seat driver side)? or anything in that module mb fuel filter...
can I test somehow cam magnets without taking them out?
will try normal filters.
just swapped map/iat sensors in 2 filters boxes (but didn't check the car yet.
After I try sth ecu probably needs some reset, can I do it with disconnecting battery? I tried to disconnect ecu but it keeps all the codes and values, no matter how long I wait.