1998 ML320 264k mi. Is there any way to clear the secondary air ports without lifting the cylinder heads? po410 code,fan works,valves clear,rt side has airflow, left side blocked Thanks...Fred

 

I just did this over the weekend on my 98 ML 320 w/ 256k miles. I needed to get my emissions inspection and the 410 code had been there for a while. The pic in this link are of the left side valve, which was completely blocked. There's a single bolt at the bottom of the post that you need to remove then pull the assembly out of the head. I had to rotate it +/- a few degrees to loosen the stub before pulling it out. The post was solid with build-up and the port in the head was solid. I just held a shop vac nozzle over the port and picked at it with a sharp tool to loosen the build-up. At some point, larger chunks came out and the shop vac got it all.

http://picasaweb.google.com/ahosmer/...eat=directlink

Good Luck!

 

I have the same problem with my ML. Mine is clogged on the driver side, and I can not see the blockage. Is there a way to clean it by removing the exhaust header?

 

I have the same exact problem with my w203, the driver side is completely blocked! Has anyone found a way to clear the blockage without removing the head?

Thanks

 

If this is about a C240, then you are on the wrong forum.

https://mbworld.org/forums/c-class-w203-3/