M113 - misfire full load at High RPM, many parts already changed
Thread Starter
Newbie
Joined: Jan 2025
Posts: 3
Likes: 0
M113 - misfire full load at High RPM, many parts already changed
Hi from Czech Republic,
Need technical help Please! For first sorry for my bad english.
I had issues with my E500 M113 with 7G.
Can someone help me?
Misfires at 6 cylinder under full load (in High RPM - something about 5,5k RPM) after that running on 7 cylinder after shut down and new start everything working well. Only CEL on cluster.
DTC: p2050 , p2055
Normally works very good (untill High RPM)
- coils new Bosch
- coils harness new Bosch
- spark plugs 7k kilometres old (switched from another cylinder)
- reworked fuel injectors
- fuel injectors switched from another cylinder
- checked harness for coils and injectors tested
- all Mosfets in ECU ok
- fuel presure was bad, but today i replaced fuel pump, and unit with filter and regulator
- new lifters on both heads
- springs on intake and exhaust manifold ok
- alternator reworked (bad charging - now ok)
- new front battery
- test run without second O2 sensors
- test run without first O2 sensors
- test run without downpipes (all 4 cats)
- checked engine compression - all around 9,5-10,5 bar
- new MAF
- engine without air leaks!
- reworked intake manifold with flaps
- cleaned throttle body
Now i waiting for new Bosch Crank Position sensor for replacement, maybe i will check harness to throttle body, MAF and CPS.
Can someone have experience with this issue?
Thanks for information.
Need technical help Please! For first sorry for my bad english.
I had issues with my E500 M113 with 7G.
Can someone help me?
Misfires at 6 cylinder under full load (in High RPM - something about 5,5k RPM) after that running on 7 cylinder after shut down and new start everything working well. Only CEL on cluster.
DTC: p2050 , p2055
Normally works very good (untill High RPM)
- coils new Bosch
- coils harness new Bosch
- spark plugs 7k kilometres old (switched from another cylinder)
- reworked fuel injectors
- fuel injectors switched from another cylinder
- checked harness for coils and injectors tested
- all Mosfets in ECU ok
- fuel presure was bad, but today i replaced fuel pump, and unit with filter and regulator
- new lifters on both heads
- springs on intake and exhaust manifold ok
- alternator reworked (bad charging - now ok)
- new front battery
- test run without second O2 sensors
- test run without first O2 sensors
- test run without downpipes (all 4 cats)
- checked engine compression - all around 9,5-10,5 bar
- new MAF
- engine without air leaks!
- reworked intake manifold with flaps
- cleaned throttle body
Now i waiting for new Bosch Crank Position sensor for replacement, maybe i will check harness to throttle body, MAF and CPS.
Can someone have experience with this issue?
Thanks for information.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Did you get the DTCs correct? Those codes are for a Diesel engine, or I cannot find them in DAS for the M113 engine.
Thread Starter
Newbie
Joined: Jan 2025
Posts: 3
Likes: 0
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Get your own Mercedes scanner. Probably less cost than going to the dealer. Very popular is the LAUNCH Creader Elite 2.0 BENZ. Just make sure it works with your car. Otherwise, you need DAS, which is for older models. DAS comes with XENTRY. Your best source for XENTRY/DAS is the BenzNinja Club.
Last edited by JettaRed; Jan 2, 2025 at 10:21 AM.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
- How many miles are on the car?
- How long have you owned the car?
- When did this problem start?
As you know, the M113 uses two spark plugs per cylinder. It seems like the ECU is shutting down cylinder 6 after the high-speed run. Turning the car off and back on resets cylinder 6.
The crank position sensor is known to go bad on the M113 from time to time. However, usually the car will not even start when that happens. I would double-check the wiring harness on cylinder 6 for any rodent damage, etc.
With all of swapping components, the problem remains with cylinder 6. Are you sure the spark plugs are the correct plugs for your engine?
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Some more questions:
These are reasons to only use a proper Mercedes scanner for diagnostics.
- How do you know which cylinder is misfiring? Misfire codes are P0300 (P0301, P0302, P3030...P0308).
- Were the codes from the generic/universal code reader current or stored?
These are reasons to only use a proper Mercedes scanner for diagnostics.
Junior Member
Joined: Jul 2022
Posts: 18
Likes: 1
2005 S500
Have you resolved this issue?
I'm experiencing something similar: I get random misfire from Bank 2 at high load, full throttle, above 5k, certainly from cyl 6, but can include cyl 8 and once cyl 7.
I've tested all the coils and switched them around. I've also replaced the spark plugs, which were all fine. Two coils that were bad are cyl 1b and 2a. These had secondary resistance of 0, meaning the coil is shorted to the primary. These weren't even misfiring!
No other codes. Fuel trim looks ok, but close to 1.06 on the LTFM for high load, 0.99 for low load, maybe even pulling a little at idle. (according to self-adaptation from DAS).
I've switched injectors 5 and 6 and will test drive again. Since the car hardly burns oil, it's strange for cyl 6 to repeatedly misfire under these conditions. The car drives fine under 5k (there's a sudden cut in power when misfire is detected).
I'm experiencing something similar: I get random misfire from Bank 2 at high load, full throttle, above 5k, certainly from cyl 6, but can include cyl 8 and once cyl 7.
I've tested all the coils and switched them around. I've also replaced the spark plugs, which were all fine. Two coils that were bad are cyl 1b and 2a. These had secondary resistance of 0, meaning the coil is shorted to the primary. These weren't even misfiring!
No other codes. Fuel trim looks ok, but close to 1.06 on the LTFM for high load, 0.99 for low load, maybe even pulling a little at idle. (according to self-adaptation from DAS).
I've switched injectors 5 and 6 and will test drive again. Since the car hardly burns oil, it's strange for cyl 6 to repeatedly misfire under these conditions. The car drives fine under 5k (there's a sudden cut in power when misfire is detected).
Hi from Czech Republic,
Need technical help Please! For first sorry for my bad english.
I had issues with my E500 M113 with 7G.
Can someone help me?
Misfires at 6 cylinder under full load (in High RPM - something about 5,5k RPM) after that running on 7 cylinder after shut down and new start everything working well. Only CEL on cluster.
DTC: p2050 , p2055
Normally works very good (untill High RPM)
- coils new Bosch
- coils harness new Bosch
- spark plugs 7k kilometres old (switched from another cylinder)
- reworked fuel injectors
- fuel injectors switched from another cylinder
- checked harness for coils and injectors tested
- all Mosfets in ECU ok
- fuel presure was bad, but today i replaced fuel pump, and unit with filter and regulator
- new lifters on both heads
- springs on intake and exhaust manifold ok
- alternator reworked (bad charging - now ok)
- new front battery
- test run without second O2 sensors
- test run without first O2 sensors
- test run without downpipes (all 4 cats)
- checked engine compression - all around 9,5-10,5 bar
- new MAF
- engine without air leaks!
- reworked intake manifold with flaps
- cleaned throttle body
Now i waiting for new Bosch Crank Position sensor for replacement, maybe i will check harness to throttle body, MAF and CPS.
Can someone have experience with this issue?
Thanks for information.
Need technical help Please! For first sorry for my bad english.
I had issues with my E500 M113 with 7G.
Can someone help me?
Misfires at 6 cylinder under full load (in High RPM - something about 5,5k RPM) after that running on 7 cylinder after shut down and new start everything working well. Only CEL on cluster.
DTC: p2050 , p2055
Normally works very good (untill High RPM)
- coils new Bosch
- coils harness new Bosch
- spark plugs 7k kilometres old (switched from another cylinder)
- reworked fuel injectors
- fuel injectors switched from another cylinder
- checked harness for coils and injectors tested
- all Mosfets in ECU ok
- fuel presure was bad, but today i replaced fuel pump, and unit with filter and regulator
- new lifters on both heads
- springs on intake and exhaust manifold ok
- alternator reworked (bad charging - now ok)
- new front battery
- test run without second O2 sensors
- test run without first O2 sensors
- test run without downpipes (all 4 cats)
- checked engine compression - all around 9,5-10,5 bar
- new MAF
- engine without air leaks!
- reworked intake manifold with flaps
- cleaned throttle body
Now i waiting for new Bosch Crank Position sensor for replacement, maybe i will check harness to throttle body, MAF and CPS.
Can someone have experience with this issue?
Thanks for information.
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Thread Starter
Newbie
Joined: Jan 2025
Posts: 3
Likes: 0
Hi, yes i resolved. Sorry for no respond there.
I already replace all. This mistake can be only adaptation mistake in ECU. Because in diagnostic tool i have column: mixture (fuel/air) adaptation : adapted , after i change camshaft position sensor i get notice in column adaptation. While and after test drive everythings working, no misfire till today, 1k kilometres +. Second day after camshaft position sensor replacement i go to star (xentry mb) diagnostic to do adaptation of everything what can do in engine ecu and transmition ecu.
now i solved and happy
about your multiple missfire can be bad MAF, fuelpressure, catalystic concerter, so many option. Please be good and go to workshop to clear and good diagnostic, if cannot help, start testing components and hope it will be good.
BTW1.My Camshaft sensor was on measure units ok.
I already replace all. This mistake can be only adaptation mistake in ECU. Because in diagnostic tool i have column: mixture (fuel/air) adaptation : adapted , after i change camshaft position sensor i get notice in column adaptation. While and after test drive everythings working, no misfire till today, 1k kilometres +. Second day after camshaft position sensor replacement i go to star (xentry mb) diagnostic to do adaptation of everything what can do in engine ecu and transmition ecu.
now i solved and happy
about your multiple missfire can be bad MAF, fuelpressure, catalystic concerter, so many option. Please be good and go to workshop to clear and good diagnostic, if cannot help, start testing components and hope it will be good.
BTW1.My Camshaft sensor was on measure units ok.
Have you resolved this issue?
I'm experiencing something similar: I get random misfire from Bank 2 at high load, full throttle, above 5k, certainly from cyl 6, but can include cyl 8 and once cyl 7.
I've tested all the coils and switched them around. I've also replaced the spark plugs, which were all fine. Two coils that were bad are cyl 1b and 2a. These had secondary resistance of 0, meaning the coil is shorted to the primary. These weren't even misfiring!
No other codes. Fuel trim looks ok, but close to 1.06 on the LTFM for high load, 0.99 for low load, maybe even pulling a little at idle. (according to self-adaptation from DAS).
I've switched injectors 5 and 6 and will test drive again. Since the car hardly burns oil, it's strange for cyl 6 to repeatedly misfire under these conditions. The car drives fine under 5k (there's a sudden cut in power when misfire is detected).
I'm experiencing something similar: I get random misfire from Bank 2 at high load, full throttle, above 5k, certainly from cyl 6, but can include cyl 8 and once cyl 7.
I've tested all the coils and switched them around. I've also replaced the spark plugs, which were all fine. Two coils that were bad are cyl 1b and 2a. These had secondary resistance of 0, meaning the coil is shorted to the primary. These weren't even misfiring!
No other codes. Fuel trim looks ok, but close to 1.06 on the LTFM for high load, 0.99 for low load, maybe even pulling a little at idle. (according to self-adaptation from DAS).
I've switched injectors 5 and 6 and will test drive again. Since the car hardly burns oil, it's strange for cyl 6 to repeatedly misfire under these conditions. The car drives fine under 5k (there's a sudden cut in power when misfire is detected).
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Junior Member
Joined: Jul 2022
Posts: 18
Likes: 1
2005 S500
Thanks. Switching the injectors didn't work; neither did unplugging the o2 sensor. MAF is clean and cleaned, and its reading very credible.
I should probably keep driving until another code pops, either cat efficiency, crank position, or cam position.
I should probably keep driving until another code pops, either cat efficiency, crank position, or cam position.
Hi, yes i resolved. Sorry for no respond there.
I already replace all. This mistake can be only adaptation mistake in ECU. Because in diagnostic tool i have column: mixture (fuel/air) adaptation : adapted , after i change camshaft position sensor i get notice in column adaptation. While and after test drive everythings working, no misfire till today, 1k kilometres +. Second day after camshaft position sensor replacement i go to star (xentry mb) diagnostic to do adaptation of everything what can do in engine ecu and transmition ecu.
now i solved and happy
about your multiple missfire can be bad MAF, fuelpressure, catalystic concerter, so many option. Please be good and go to workshop to clear and good diagnostic, if cannot help, start testing components and hope it will be good.
BTW1.My Camshaft sensor was on measure units ok.
I already replace all. This mistake can be only adaptation mistake in ECU. Because in diagnostic tool i have column: mixture (fuel/air) adaptation : adapted , after i change camshaft position sensor i get notice in column adaptation. While and after test drive everythings working, no misfire till today, 1k kilometres +. Second day after camshaft position sensor replacement i go to star (xentry mb) diagnostic to do adaptation of everything what can do in engine ecu and transmition ecu.
now i solved and happy
about your multiple missfire can be bad MAF, fuelpressure, catalystic concerter, so many option. Please be good and go to workshop to clear and good diagnostic, if cannot help, start testing components and hope it will be good.
BTW1.My Camshaft sensor was on measure units ok.
Junior Member
Joined: Jul 2022
Posts: 18
Likes: 1
2005 S500
I think it's the camshaft position sensor. After cleaning it, the problem seems resolved.
The crank sensor may also be marginal, as every sensor on this car is original from 2005. The giveaway was that all misfires started with cyl 6. I wondered why (since bore-scope, injectors, ignition, cat scope all checked out) until realizing that the crank sensor sees the missing teeth as cyl 1 and 6 TDC.
The crank sensor may also be marginal, as every sensor on this car is original from 2005. The giveaway was that all misfires started with cyl 6. I wondered why (since bore-scope, injectors, ignition, cat scope all checked out) until realizing that the crank sensor sees the missing teeth as cyl 1 and 6 TDC.
