E220 smoke problem. help!

[ds99]

This has probbably been asked many times before, so forgive me, but can someone offer some advice?

I have a E220 cdi (year 2000 model). It smokes badly under hard accelleration. I just had the MOT done and the guy said he had to rev it five times before it passed the emissions test

I have changed the oil, changed the air filter. Car starts and runs well, mpg is good. Smoke is black (not blue). It has done 130,000 miles.

Any ideas?

 

[alexanderfoti]

Its is likely your EGR valve is stuck open slightly. High mileage CDI's often have this issue. My 320cdi had the same problem.

Have a search on the forum for EGR shunt. It could also be bad spray pattern from the injectors or your air filter is blocked.

 

[ds99]

OK, thanks - i would like to do this EGR mod. Can anyone offer any advice? Or even better, can someone made up the mod for me and I will pay them?

Thanks

Dave

 

[WG M-B]

Before the mod is put in place it's best to clean the egr out properly and make sure it stays shut! Otherwise you will still get black smoke

 

[ds99]

Err, forgive my ignorance but where exactly is the EGR?

 

[ds99]

an update if anyone is interested...

i found the EGR valve thingy and disconnected the air hose going into it, it had a LOT of black tar-like sticky stuff in there, i cleaned it out the best i could, i could not get the EGR valve off as there were a number of bolts i just could not get to. so i just squirted a load of WD40 in there and used rags/tootbrush/screwdriver wrapped in rags to clean out most of the gunk. i took the car for a drive afterwards and it defintely smokes less on accelleration (i.e. i can see the car behind in the mirror now!)

feeding exhaust fumes back into the engine doesnt seem like a very wise idea, but i guess engine designers know better than me!