You may want to also rule out the vacuum transducer itself as the cause by swapping it with the one from the turbo's wastegate (they are identical). If the code changes to the wastegate code you will know the problem is with the transducer itself but if it stays with the EGR system it is either the vent/filter or the EGR valve itself causing the problem. You can test the EGR valve using a mity-vac if you have one or can buy one at Sears. Basically it is a small vacuum pump to test these vacuum driven devices. If it holds vacuum and you can hear a change in the way the engine runs (it might stall when you actuate it) then you will know the EGR valve is OK...but first I would try the swap and see what happens.

Sometimes swapping them will eliminate codes completely (at least temporarily) because each system has different parameters for setting off a CEL and the EGR might be more sensitive than the wastegate for a particular parameter - so you might just get lucky and fix it (for now) by doing the swap.

__________________
Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

I really appreciate your help! Going to be gone for a couple of days but will report back on what I get figured out.

thanks again,
Bill

Need more help. Blew out the line from the EGR transducer to the vent filter and actually replaced the filter…still threw the P0400. Then switched the two transducers, cleared the DTC and it still throws the P0400.

Suggestions please.
thanks

[QUOTE=wjob;2648559]Need more help. Blew out the line from the EGR transducer to the vent filter and actually replaced the filter…still threw the P0400. Then switched the two transducers, cleared the DTC and it still throws the P0400.

Can someone please help with the above question

thanks

Need more help. Blew out the line from the EGR transducer to the vent filter and actually replaced the filter…still threw the P0400. Then switched the two transducers, cleared the DTC and it still throws the P0400. What do I do next?

Can someone please help with the above question

thanks[/QUOTE]

I'd suggest pulling the egr valve and checking it out along with all the plumbing that is attached to it.

__________________
Jim

Assume I have to pull the IM to get at the valve? Any other test I can make to be absolutely sure it is the valve before pulling things apart? Any chance that electrical connection to the transducer could be causing the problem?

You might consider just defeating EGR. There is a thread in this forum or same information covered here ( http://www.superturbodiesel.com/std/w210-om606-962-egr-delete-t-1871.html) might have to cut and paste that into your browser. Easier than it looks and requires about $3.00 of parts from Radioshack. Once installed the computer "thinks" it's causing the EGR to open and let that lovely oily soot into your intake while eliminating the code. Of course if your EGR is stuck open then you still have something to fix when you have time to pull the manifold.

If I did this then my valve would always be closed, right? What effect would this have on performance? Sounds like it makes sense?

Yes, the EGR valve would then stay closed and no more hot, soot laden exhaust will be sent into your intake. We really don't notice any difference in performance with ours but in theory I suppose the cars might make a little more power since the temperature of the intake air will be lower than it was with exhaust blended in. Reduction in power because of hotter intake air is one of the reasons the heavy duty engine guys like Cat/Cummins, etc., are using "cooled EGR" systems as part of their current emissions strategies.

Thanks for all this! Believe I mentioned mine is a '99 E300TD and assume yours is also, the one where you disabled the valve? Where do I find that collection of wires that I will need to tap into? Sounds like it's either going this route or pulling the IM, etc. to get at the valve? Any way I can get a look inside the valve to determine whether it is stuck open without taking the IM off? I had asked before is there any chance the transducer electrical connection could be the problem?

Fred B, can you help with this, or anyone else?

thanks

Kartek on this site created an EGR defeat for the 98 and 99. Search for it here.

Make certain you are looking at his turbo thread as the non turbo 606 is a different animal and much easier to do.

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

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

Any way I can get a look inside the valve to determine whether it is stuck open without taking the IM off?

I had asked before is there any chance the transducer electrical connection could be the problem and if so, how would I check?

thanks

Answers to these 2 questions, please