Mercedes A200 2.1 Engine issues
Discussion
Hi,
I have a 2015 A200D 2.1 Mercedes and it started to become sluggish including a misfire and struggled to idle but once warm seemed better but not perfect. After a few weeks it seemed to be getting worse and it would often stall at junctions. It eventually gave an engine light P0272 Cylinder 4 Contribution/Balance.
It went into a garage and they replaced Injector 4 and coded it, from the second I picked it up it wouldn't rev over 2500 then once I restarted the car it drove up the road but very lethargic. The garage said it would need a regen before things settled down and take it on a long run. I have since done several very long spirited runs and constant and when I got home the exhaust was pinging and was roasting hot which I though would be a good indication of a re-gen.
The light has come back on again now same fault code exactly, annoying after spending out what seems for nothing.
Any ideas or known issues that could cause this or I could check related to the fault P0272. I have a cheapo code reader than can get some engine data off and pretty handy with some spanners back in the day
Thanks
Neal
I have a 2015 A200D 2.1 Mercedes and it started to become sluggish including a misfire and struggled to idle but once warm seemed better but not perfect. After a few weeks it seemed to be getting worse and it would often stall at junctions. It eventually gave an engine light P0272 Cylinder 4 Contribution/Balance.
It went into a garage and they replaced Injector 4 and coded it, from the second I picked it up it wouldn't rev over 2500 then once I restarted the car it drove up the road but very lethargic. The garage said it would need a regen before things settled down and take it on a long run. I have since done several very long spirited runs and constant and when I got home the exhaust was pinging and was roasting hot which I though would be a good indication of a re-gen.
The light has come back on again now same fault code exactly, annoying after spending out what seems for nothing.
Any ideas or known issues that could cause this or I could check related to the fault P0272. I have a cheapo code reader than can get some engine data off and pretty handy with some spanners back in the day
Thanks
Neal
At a loss with this one now..Garage has done the following
Compression ok...
Injectors / seats replaced
Inlet manifold replaced flaps were blocked and not working with carbon, EGR cooler / Valve all cleaned up.
Still the same.....start the car you can not use the paddles, restart it again and then it runs rough at idle and throws an engine management light. Same code as before cylinder 4 inbalance. If you take it up the dual carriage way it has full power and runs fine.
Any one got any other idea I can try?
Kind Regards
Neal
Compression ok...
Injectors / seats replaced
Inlet manifold replaced flaps were blocked and not working with carbon, EGR cooler / Valve all cleaned up.
Still the same.....start the car you can not use the paddles, restart it again and then it runs rough at idle and throws an engine management light. Same code as before cylinder 4 inbalance. If you take it up the dual carriage way it has full power and runs fine.
Any one got any other idea I can try?
Kind Regards
Neal
Thank you for the contributions.
I had the garage do another compression check and this time they have showed me pictures and cyl 4 is much lower.
In the meantime I also had a new inlet manifold fitted as flaps did not work they were seized in carbon and the EGR valve / cooler also cleaned up.
Is it possible that the valves could be covered in carbon too which is not sealing at idle?
The garage says they are probably burnt out but cant trust as they just want it out now saying they don't have the specialist tools to fix.
Don't know where to go now... would anyone recommend a mobile carbon clean thingy or is my car doomed?
I had the garage do another compression check and this time they have showed me pictures and cyl 4 is much lower.
In the meantime I also had a new inlet manifold fitted as flaps did not work they were seized in carbon and the EGR valve / cooler also cleaned up.
Is it possible that the valves could be covered in carbon too which is not sealing at idle?
The garage says they are probably burnt out but cant trust as they just want it out now saying they don't have the specialist tools to fix.
Don't know where to go now... would anyone recommend a mobile carbon clean thingy or is my car doomed?
Its possible its just dirty valve seats (ie coked in carbon) which is the issue here, but it could also be a scored bore, and/or a piston ring broken up, and/or the piston skirt broken up.
I have a car which had low compression on one cylinder. Took the head off - which wasn't trivial, I needed to buy a £280 specialist tool to remove the injectors safely for reuse - and didn't find any issue with the valves apart from being filthy (it was a direct injection petrol). So, I filled the cylinders with oil and left it a week, one kept the oil and the other didn't. Suspecting rings, I removed the sump (needed an engine brace bar over the top, since the head was off and the engine was being held on a trolley jack at the time) and the piston/conrod. Close inspection showed damage to the piston.
In parts itself, it didn't cost that much. But it did cost about £500 in extra tools (which I still have, and could sell or reuse on another car another time), and it took a LOT of time up.
https://www.youtube.com/watch?v=I32DfqbGl2Y and https://www.youtube.com/watch?v=fUsI0ypD52k show a similar journey down a rabbithole, he's not even fixed it yet.....
I have a car which had low compression on one cylinder. Took the head off - which wasn't trivial, I needed to buy a £280 specialist tool to remove the injectors safely for reuse - and didn't find any issue with the valves apart from being filthy (it was a direct injection petrol). So, I filled the cylinders with oil and left it a week, one kept the oil and the other didn't. Suspecting rings, I removed the sump (needed an engine brace bar over the top, since the head was off and the engine was being held on a trolley jack at the time) and the piston/conrod. Close inspection showed damage to the piston.
In parts itself, it didn't cost that much. But it did cost about £500 in extra tools (which I still have, and could sell or reuse on another car another time), and it took a LOT of time up.
https://www.youtube.com/watch?v=I32DfqbGl2Y and https://www.youtube.com/watch?v=fUsI0ypD52k show a similar journey down a rabbithole, he's not even fixed it yet.....
Terraclean is pointless, if its rough on idle are you sure there are no airleaks ?
Before changing the injector did they do simple checks like unplug it to see what happens, it seems odd to just change the injector based on the fault code, you would really want to be sure before committing. I don't understand why they thought it would want a regen, if it needed one then they should have carried it out to see the job through.
Before changing the injector did they do simple checks like unplug it to see what happens, it seems odd to just change the injector based on the fault code, you would really want to be sure before committing. I don't understand why they thought it would want a regen, if it needed one then they should have carried it out to see the job through.
Not sure what the exact test was i got the below pics ...showing cylinder 4 was down on psi.
If you don't let the car idle and drive it seems fine no power loss absolutely as normal.
When it stops it idles a bit rough then throws a light. As I said earlier the manifold was blocked flaps seized which has been replaced so i though could valves in cylinder 4 be gunked up and not sealing. Would it drive so perfect off idle if they were burnt out?
If you don't let the car idle and drive it seems fine no power loss absolutely as normal.
When it stops it idles a bit rough then throws a light. As I said earlier the manifold was blocked flaps seized which has been replaced so i though could valves in cylinder 4 be gunked up and not sealing. Would it drive so perfect off idle if they were burnt out?
Unfortunately I believe these engines have a known exhaust valve issue.
“A "burnt valve" in an A200 engine, refers to a valve that has been damaged by excessive heat, often due to a poor seal between the valve and its seat. This can lead to a loss of compression, poor engine performance, and potential engine damage.”
“A "burnt valve" in an A200 engine, refers to a valve that has been damaged by excessive heat, often due to a poor seal between the valve and its seat. This can lead to a loss of compression, poor engine performance, and potential engine damage.”
Low compression --> remove head. There is no shortcut. There is no "fix" which can easily be done without removing the head. I guess it would be possible to diagnose more precisely what it is before removing the head, which might be useful in a scrap/fix decision. But if you're paying for that diagnosis, its just more money to spend and more time spent putting off removing the head.
Dynion Araf Uchaf said:
E-bmw said:
Good luck finding one on a diseasel.
Just sayin'.
didn't twig it was a diesel. Even though I think I had the same engine in a Merc 10 plus years ago now you mention it.Just sayin'.
Is it possible to look down the glow plug 'wells' with a boroscope?
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