w203 misfire

[jacmotors]

hi there wondering if anyone else has come across a misfire that accurs when sitting in traffic but not all the time the car will be fine all the time it is driving say to scotland and back but the moment it stops in traffic for sometime it will develop a missfire on no 2 cylinder when the car is turned of and restarted it is fine , we have checked for air leaks changed coils and plugs checked o2 sensors compression tested the engine and changed injectors about the engine but the fault remains on no2 cylinder. please help!

 

[1nevster]

What engine is in your W203 chasis?

 

[jacmotors]

its a 2002 c180 kompressor. thanks

 

[azaman]

That sounds like a worn breather hose mate. What is your engine fault code?

The hose is £7 (I have one spare if you want it) and takes about 45mins to replace.

 

[BlackC55]

Or a problem with number one coil pack or lack of compression.

The coil pack gets contaminated with water.

 

[jacmotors]

i have checked the hoses and swapped the coil packs round and swapped the injectors round and it always comes back to number two cylinder and only appears when sitting on tick over for a period of time thanks.

 

[jacmotors]

any help please?????

 

[BlackC55]

have you done a compression check?

 

[jacmotors]

yes i have

 

[BlackC55]

What were the results when hot?

 

[jacmotors]

number two cylinder was down by about 10pound

 

[BlackC55]

What were all of the results for all of the cylinders?

 

[jacmotors]

170 on other cylinders and 160 on number 2

 

[BlackC55]

Was that at operating temp?

 

[jacmotors]

normal running temp of about 80

 

[BlackC55]

The head needs to come off then and be pressure tested.

 

[jacmotors]

ok thanks will try that and let you no. thanks for all your help