EGR switchover valve

[spc]

hello all,after having problems with my 1994 220 diesel i.e,when starting her first thing on a morning the EDC will light after about 5 seconds,revs rise then she stops,turn the key again,she starts,EDC light comes on immediately,and stops,third turn of the key she starts,runs fine for about a mile when the EDC comes on and she goes into get you home mode[reduced power],when i stop and turn off the engine and restart she runs perfect all day,until the next morning when the performance is repeated.i had it put on a friends diagnostic computer and it came up EGR switchover valve Y27 circuit.can any one help as to what i can do next,thanx.

 

[television]

I cant see the EGR valve putting the car into the limp home mode, it sounds more like the MAF filter needs cleaning/ replacing.

Read the article under engines on how to do it by Parrot.

Malcolm

 

[spc]

thanx malcolm il try it,ps,what is an egr valve?thanx,stan.

 

[television]

thanx malcolm il try it,ps,what is an egr valve?thanx,stan.

The EGR valve is a valve that sits in the exhaust manifold. When the car is running light,say motorway this valve opens and returns any harmfull gas back to the intake of the engine. After 70k miles the spring gets weak its operating at 400-600c. Once the spring is weak it could stick in the partly open posistion,this would cause poor idle.

The trade motor press say that it a waste of time trying to clean it,the spring gets weak,this alone can let it get very dirty soon after.

Most people on the forum would rather clean than replace, its hard to get it accross that the spring is weak.

Hope this helps. Malcolm

 

[spc]

hi malcolm,having read parrots description mine seems different,i think all ive got on my air box hose is an air temp meter,do i need to look elsewhere for the air mass meter?thanx very much for your time and patience to a first time mercedes owner [2 weeks],stan.

 

[television]

Let me have the first 6 VIN numbers WDB------ And I will see what I can find.

Malcolm

 

[spc]

hi malcolm,WDB202121.

 

[television]

http://www.detali.ru/cat/oem_mb2.as...416717.418&CT=M&cat=19R&SID=14&SGR=090&SGN=04

Well as it happens your car does not have one,and there only 3-4 that dont.

this then comes back to your friends dianosis then got to be the EGR valve, the picture is in the Above thread.

so that you get to know your car a little better,go to this site,look for the 202121 car, and you have everything on the car shown.

http://www.detali.ru/cat/oem_mb0.asp?TP=1

Good luck. Malcolm

 

[spc]

thanx for all your help malcolm,seems she is one of the few then,il have to have a closer look at the egr valve,do you think i should renew it ?

 

[television]

thanx for all your help malcolm,seems she is one of the few then,il have to have a closer look at the egr valve,do you think i should renew it ?

Yes,do not try and clean it, they cost I think about £70. Thinking since my last answer, I can recall that it did solve another with the same problem.

These things are not made by MB, and it could pay you to check with people like Parts Co,if you can. Much cheaper.

Malcolm

 

[spc]

hi malcolm,after reading other posts i cheked my clear diesel line and saw loads of air bubbles in it,the post i read was for a 250,i think,will my 220 have the same system as he recomended checking the diesel heater rubber washer,does my car have one.thanx in advance,stan.

 

[television]

http://www.detali.ru/cat/oem_mb2.as...416717.418&CT=M&cat=19R&SID=07&SGR=120&SGN=03

This any good to you.

malcolm

 

[spc]

yes malcolm,thanx.stan.