c180k misfire issue
09-17-2013, 01:43 AM
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c180 Kompressor 2005
c180k misfire issue
hi All, I am really confused and need some ideas as to where to look for a weird issue that I am having with my C180K 2005.
the morning start is a little rough on some mornings, ie you start the car and for the first 30 secs she runs rough and misfires. then it clears and the motor smooths off and all is ok. this is intermittent, ie might happen once or twice a week.
then when the car is on the road everything feels ok, motor responds well, fuel economy is not great, approx. 8,2l/100kms and this is mostly local driving, ie not long runs.
then, also intermittently, the car will stat to misfire when you come to a robot or stop street. it feels as if she is only running on 2 cylinders.
there is no warning apart from a slight vibration coming from engine, and then suddenly will start the misfire.
you can be in full and proper town stop start driving with no problems, and then this will suddenly kick in.
to clear the problem you turn the engine off, give it 5 secs and restart and she runs properly.
the same issue might happen at the next robot, but then again turn off and restart and she runs properly.
a point to note is that once she stats this it will carry on happening until the motor has been turned off and allowed to cool down, or until you get onto a long run.
the issue does not appear to be influenced by engine temp, it can happen when motor is at full running temp or even at 3/4 running temp.
apart from cold start as described above never happens when cold.
I have checked the following;
compression all 4 cylinders within spec
changed fuel filters and run injector cleaner through tank on 3 occasions
changed spark plugs
changed oil filters
changed air filters
have taken off all air sensor connectors and cleaned with crc cleaner and have gone over all wiring that I can think of that might have any bearing on this, ie cam timing sensors etc and checked harnesses and connectors.
there are no error codes in the system (have had a Star diag done), and no error code comes up on display when the problem occurs.
I am very confused, sounds like possibly a fuel problem, but cannot find any reason for it...
any ideas...HELP !!
cannot find any traces oil leaks on electronics or cabling or sensors
the morning start is a little rough on some mornings, ie you start the car and for the first 30 secs she runs rough and misfires. then it clears and the motor smooths off and all is ok. this is intermittent, ie might happen once or twice a week.
then when the car is on the road everything feels ok, motor responds well, fuel economy is not great, approx. 8,2l/100kms and this is mostly local driving, ie not long runs.
then, also intermittently, the car will stat to misfire when you come to a robot or stop street. it feels as if she is only running on 2 cylinders.
there is no warning apart from a slight vibration coming from engine, and then suddenly will start the misfire.
you can be in full and proper town stop start driving with no problems, and then this will suddenly kick in.
to clear the problem you turn the engine off, give it 5 secs and restart and she runs properly.
the same issue might happen at the next robot, but then again turn off and restart and she runs properly.
a point to note is that once she stats this it will carry on happening until the motor has been turned off and allowed to cool down, or until you get onto a long run.
the issue does not appear to be influenced by engine temp, it can happen when motor is at full running temp or even at 3/4 running temp.
apart from cold start as described above never happens when cold.
I have checked the following;
compression all 4 cylinders within spec
changed fuel filters and run injector cleaner through tank on 3 occasions
changed spark plugs
changed oil filters
changed air filters
have taken off all air sensor connectors and cleaned with crc cleaner and have gone over all wiring that I can think of that might have any bearing on this, ie cam timing sensors etc and checked harnesses and connectors.
there are no error codes in the system (have had a Star diag done), and no error code comes up on display when the problem occurs.
I am very confused, sounds like possibly a fuel problem, but cannot find any reason for it...
any ideas...HELP !!
cannot find any traces oil leaks on electronics or cabling or sensors
09-17-2013, 12:20 PM
#2
Super Moderator
No error codes. Hmmm! Then we need to look at things that don't throw codes generally.
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors. s/b >3.8 bar or 55 psi while cranking. Maybe pump is on it's way out. Did you use an OE filter? The pressure regulator is built into the filter. Might be fuel starvation at cold open loop full enrichment or high demand. Does not make sense when coming to a halt ~ see throttle body. Low fuel pressure does not throw a code.
Service the throttle body. Clean body & actuator tracks. Sometimes actuator becomes erattic. Cleaning can help or sometimes the only answer is replacement. This does not throw a code.
Check CPS ~ sometimes CPS problems throw no codes. CPS is very temperature sensitive.
The MAF sometimes throws no codes but it seems you have cleaned & replugged.
There are many electrical problems that can cause what you are experiencing like coilpacks etc but you would be storing misfire codes even if you had no CEL.
8,2l/100 in town is fine.
Good luck!
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors. s/b >3.8 bar or 55 psi while cranking. Maybe pump is on it's way out. Did you use an OE filter? The pressure regulator is built into the filter. Might be fuel starvation at cold open loop full enrichment or high demand. Does not make sense when coming to a halt ~ see throttle body. Low fuel pressure does not throw a code.
Service the throttle body. Clean body & actuator tracks. Sometimes actuator becomes erattic. Cleaning can help or sometimes the only answer is replacement. This does not throw a code.
Check CPS ~ sometimes CPS problems throw no codes. CPS is very temperature sensitive.
The MAF sometimes throws no codes but it seems you have cleaned & replugged.
There are many electrical problems that can cause what you are experiencing like coilpacks etc but you would be storing misfire codes even if you had no CEL.
8,2l/100 in town is fine.
Good luck!
09-18-2013, 01:39 AM
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c180 Kompressor 2005
No error codes. Hmmm! Then we need to look at things that don't throw codes generally.
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors. s/b >3.8 bar or 55 psi while cranking. Maybe pump is on it's way out. Did you use an OE filter? The pressure regulator is built into the filter. Might be fuel starvation at cold open loop full enrichment or high demand. Does not make sense when coming to a halt ~ see throttle body. Low fuel pressure does not throw a code.
Service the throttle body. Clean body & actuator tracks. Sometimes actuator becomes erattic. Cleaning can help or sometimes the only answer is replacement. This does not throw a code.
Check CPS ~ sometimes CPS problems throw no codes. CPS is very temperature sensitive.
The MAF sometimes throws no codes but it seems you have cleaned & replugged.
There are many electrical problems that can cause what you are experiencing like coilpacks etc but you would be storing misfire codes even if you had no CEL.
8,2l/100 in town is fine.
Good luck!
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors. s/b >3.8 bar or 55 psi while cranking. Maybe pump is on it's way out. Did you use an OE filter? The pressure regulator is built into the filter. Might be fuel starvation at cold open loop full enrichment or high demand. Does not make sense when coming to a halt ~ see throttle body. Low fuel pressure does not throw a code.
Service the throttle body. Clean body & actuator tracks. Sometimes actuator becomes erattic. Cleaning can help or sometimes the only answer is replacement. This does not throw a code.
Check CPS ~ sometimes CPS problems throw no codes. CPS is very temperature sensitive.
The MAF sometimes throws no codes but it seems you have cleaned & replugged.
There are many electrical problems that can cause what you are experiencing like coilpacks etc but you would be storing misfire codes even if you had no CEL.
8,2l/100 in town is fine.
Good luck!
please bear in mind that this is totally random, the "episodes" can be 2-3 months apart or it can happen every 2nd day for a week or so type thing.
lastly, not sure if this has any bearing on this... when driving (normally on freeway) the central locking will from time to time just unlock the car.
again there are no error codes in the system.
is this all perhaps a poor earth strap or something similar ?
thanks again, regards...
09-19-2013, 12:05 PM
#4
Super Moderator
The top 3 are the most likely in that order.
Fuel pressure is the easiest to check. It might be borderline & you might have dirt moving around in the system that varies it.
TB is almost always the cause of spluttery starts on the M271 if electrics are up to snuff.
CPS would generally give you a lot more trouble than you are experiencing but can't be rulled out 100%
Fuel pressure is the easiest to check. It might be borderline & you might have dirt moving around in the system that varies it.
TB is almost always the cause of spluttery starts on the M271 if electrics are up to snuff.
CPS would generally give you a lot more trouble than you are experiencing but can't be rulled out 100%
09-20-2013, 05:52 AM
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The top 3 are the most likely in that order.
Fuel pressure is the easiest to check. It might be borderline & you might have dirt moving around in the system that varies it.
TB is almost always the cause of spluttery starts on the M271 if electrics are up to snuff.
CPS would generally give you a lot more trouble than you are experiencing but can't be rulled out 100%
Fuel pressure is the easiest to check. It might be borderline & you might have dirt moving around in the system that varies it.
TB is almost always the cause of spluttery starts on the M271 if electrics are up to snuff.
CPS would generally give you a lot more trouble than you are experiencing but can't be rulled out 100%
