I can see air bubbles traveling fast through the fuel line from the pre filter and the line that goes to the SOV(I think that is what its called. Car very hard to start initially but then starts when warm, engine misses on acceleration.

At first I was getting one P0200 code then two of these P0200 codes and now back to only one P0200 code.

Anyone have any thoughts?

I had to replace the intake manifold with the old gasket, could this cause this in any way?

The only way I initially got it started and I know it cant be good for the starter was engageing it for about 20 seconds and even when the engine seems to be started. It was the only way to initially keep it running.

Check that you got all the vac lines reconnected. MAP sensor on firewall to charge air pipe and tranducer down to EGR.

To prime the system you manually crank for 30 sec's at a time. Sometimes takes 5 or 10 times. Refilling both filters with fuel usually makes it quicker. When it coughs, it is usually necessary to keep cranking a few secs longer to make certain it is running. Doesn't harm anything.

If you see air in line #2, your leak has to be at one or the other end of line #1. If you changed the pre-filter, did you reinstall the big oring that seals it to the metal filter housing?

fuelflow.JPG (image)

Also check that all your fuel lines are routed properly.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Hello, I had no reason to prime the system because it always had fuel in lines. I did remove the prefilter to see if it was clogged with anything and not sure if the air in lines was there before or after I removed it to blow out any debris.

I see no leaks and all lines were replaced about 18 months ago. Car starts up easily but still misses when accelerating

When I changed out the glow plugs on my 96 e300d, I too got the same P0200 code come up after the repair was done. On the underside of the intake manifold, there are the resonance flap controllers, connected electrically with small connectors. Upon closer inspection, I found one of the wires had somehow broken, and once repaired, the code was cleared and has not returned. I would clean both electrical plugs with electronic cleaner, and make sure the wires are intact, and that they are both firmly seated. Even with the code, my car did not exhibit any issues with starting or acceleration. Hope this helps.





The generic reader code P0200 can come up as a result of the following MB specific codes from stealership or a good independant MB shop:
P1220=Fuel quantity actuator (IFI) (Y23/1)
P1223=Fuel rack position sensor (Y23/1l1)
P1475=Resonance intake line switchover valve (Y22/7)
P1476=Resonance intake manifold switchover valve (Y22/6)
P1611=IFI control module (N3/7)
P1613=IFI control module (N3/7)
P1614=IFI control mudule (N3/7) or fuel metering actuator (Y23/1k1) or fuel rack position sensor (Y23/1l1)
P1617=control module not coded
P1622=Electohydraulic shut-off actuator (Y1/1)

__________________
96 E300d

I was very careful in replacing all these wires and vac hoses which is why this is so frustrating plus this these connections would not cause air bubbles in the lines right now. So I guess Im looking at two complete different problems, AGH!