'99 e320 P0410 - PeachParts Mercedes-Benz Forum

rjk · #1 04-20-2013, 07:17 PM

I've posted this before but didn't get any clear answers so I'm trying again in the hopes someone has come across this since.

P0410 is reason for MIL.

Here is what I found after digging into the system;
1) air pump is fine, blows strong at start-up
2) vacuum solenoid works fine, vacuum at both check-valves & both check-valves work fine
3) O2 sensor seems to be functioning as it should.
4) R&R'd both check-valves and both ports into the head were clogged with black crud.
5) picked out crud w/a small jewelers screwdriver then blew out resultant crumbly bits w/compressed air
6) Sprayed MAF cleaner down ports
7) Port on driver's side (lft) seems to be clear
8) Port on passenger side (rt) remains clogged deeper down, currently has MAF cleaner soaking in it
9) spun crank, no change, MAF cleaner remains at the same level in the port

QUESTIONS REMAINING:
1) can I clear the clog with something long & flexible?
2) planning on letting the port soak overnight then trying to blow it out with compressed air, any reason I should not attempt this?

rjk · #2 04-27-2013, 03:13 PM

bump

johnflight1 · #3 07-01-2013, 06:26 PM

the problem is that where the ports terminate under the exaust valves the carbon in that extreme enviorment is super hardened carbon. you must remove the heads take the valves out and use a drill bit to dig out the carbon. I used a #30 drill bit on my SL500 heads M119 eng. The carbon was very hard there would have been no way to desolve it with any chemicals