c180 Misfire compression low cylinder 3

is the compression 150 against 200 in other 3 cylinders too low that it will misfire


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oasisuk

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Dear Merc Gurus and Forum specialists,
My C180 COUPE engine 271 is misfiring on cylinder 3 with error code P0303 and behaving rougly on idle. Had Spark Plug changed and Ignition coils on cylinder 3 but it only became bit better to what it was. I took it to garage yesterday for diagnosis with P0303 including some other code TWC etc…
Anyways they did compression test and it was Cylinder 1 = 200 Cylinder 2 = 200 Cylinder 3 = 150 Cylinder 4 = 200. So they said its low on compression.
I bought this car one year back and had same problem on cylinder 3 so got it fixed by paying 2000 pounds for taking off cylinder head and scratching carbon putting valves etc...and its back again. So I took it to the mechanic who fixed it and he is saying that pressure 150 on cylinder 3 is not a big difference that it will result in misfire. He said he wants to do Cylinder Leakage test and lots of other bull**** (excuse my language I am just fed up) which just went over my head. This mechanic ripped me off last time by quoting 800 pounds for taking off cylinder head and repairing it and I ended up paying 2000 pounds to get my car back.
Any quick fix ????
Any suggestions what shall I do??? I don’t want to pay same money again to get it fixed. No one will buy it with engine light On and Its ethically not right either, though i was given this car in same state by a lady who probably turned off engine light and managed to sale it to me for 6500 pounds . It was my first car right after I passed my license, probably biggest mistake of my life. Anyways I have learned my lesson but please if anyone could give any suggestion to get this situation a bit better.
I posted a thread named "C180 Misfire mystery Please help" few days back. So if you wanna refer to that here is link for detailed description of car behaviour if you are interested.

http://www.mbclub.co.uk/forums/engine/71551-c180-misfire-mystery-please-help.html

Thank you very much.
Kind regards,

Location (West London)
http://www.mbclub.co.uk/forums/engine/71551-c180-misfire-mystery-please-help.html
 

BlackC55

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Put some fuel system cleander in (strong dose) and drive it very hard with high revs for an hour. Then check the cylinders again.
 
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oasisuk

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Hi Black c55,

Could you please explain how can i do that? Can i do it myself? Where can i get fuel system cleander (is it cleaner)??
sorry but i dont know much about cars... Thanks...
 

Mark300SL

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Could you please explain how can i do that? Can i do it myself? Where can i get fuel system cleander (is it cleaner)??
sorry but i dont know much about cars... Thanks...

If you are that unsure then I recommend you take a trip from london to Portsmouth and go and see Olly (BlackC55) and let him do it for you.

If he diagnoses a problem then he is very good and well priced - at least he won't rip you off.


Mark
 
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oasisuk

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Hi Guys,

Thanks for your replies and valueable suggestions.I will go to Oli this saturday.

regards.
 
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oasisuk

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Hi Olly,

When you will be there? Or shall i give it a try myself. I cant check compression after 1 hour of high REV on motorway...
Shall I take it to some garage to do another compression test.?
or just wait if check engine light turns off and car starts behaving normally?

thanks...
 

jaymanek

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We have just rebuilt a C180 engine that had 150 compression on cylinder 1.. turned out to be the valves at fault.
 

BlackC55

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Call the workshop on saturday am and speak to Jack. I won't be in. 02392570123 and We would be happy to help.
 

BlackC55

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The lack of compression WILL cause the missfire. The lack of compression is picked up and the injector is cut.
 
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oasisuk

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thanks olly.. will ring on saturday morning.

thanks for your help.
 

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