1997 e300 NON turbo with 131k miles. 3 week old issue. checked all vacuum tubes,connections - ok, cleaned the cross over tubing, flaps cleaned- the list goes on.It used to light up on idle - now it's only lighting up when I accelerate and push the accelerator almost past half way point. Car runs perfect otherwise

There are only 2 things I'm debating to replace, either the vacuum transducer attached to the air filter box that feeds vacuum to the EGR, or the EGR itself.

QUESTION: How do I check these components on the bench to make sure that it is bad?

Thanks for the help

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a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____

IIRC you ought to have a second tranducer controlling the resonance flaps. Swap them and see if the code moves.

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Terry Allison
N. Calif. & Boca Chica, Panama

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

I guess if the codes move, it'll be the transducer that is at fault. Is there any data in checking the EGR valve ?

__________________
a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____

Facing the engine, on right side top of intake manifold make sure that small vacuum hose isnt split, and is still connected. You might also want to take a pipe cleaner and clean out the nipple on the intake manifold. Also, you might want to remove the EGR and clean with Brake Cleaner, it just might not be opening all the way. keep us posted.

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD

On my dot 962 there are electrical current and pressure tests used to diagnose the wastegate transducer so I would imagine the same exists for your dot 912 transducers. Entails measuring current/amp drop at specific ECU pins at different rpms. I don't have that data for yours.

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Terry Allison
N. Calif. & Boca Chica, Panama

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

Great idea. I'll do these tonight.

That's ok. I'll swap them around and see what happens. it'll be obvious if the problem follows a particular transducer, then that's the problem.

__________________
a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____

I cleaned the nipple coming off from intake manifold - which is connected to a transducer on the firewall (drivers side). The CEL stayed off for 2 days, then this morning , upon my wifes lead foot, it comes on again and ofcourse upon acceleration.

The last code it threw was a P0200 ( injector circuit open) . Previous to that, it was a P0400 (EGR airflow malfunct). Different codes, same scenario- acceleration.

I jokingly told my wife that it is operator error.....it wasn't funny in her book

__________________
a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____