merc s class running bad

[bricky]

merc s class running bad 320cdi auto 2001

hi everyone just had car into garage with which i thought was a gearbox problem anyway they hooked it up to the computer it came back with mass air flow switch (the origanal prob was when driving at say 50mph when i put foot down the auto box would not kick down) i was told this switch would be the main cause of this? so they replaced it with an after market one but the problem till goes on i was told by a specialist that with mercs i would need to get an origanal part because the car rejects the after market type pls could anybody shine some light on this before moer money could be poss wasted :confused
many thanks
bricky

 

[television]

Hello and welcome bricky to the forum, yes the odd imported MAF filters do not work or last well, the cheapest place is from a Bosch service center at £147

 

[Xtractorfan]

The Maf for the 320 cdi from Mb is only around £60 and it really will improve the car no end ... and i think your Maf is actually Pierburg and not bosch ring Mb parts with the chassis no and price it..

 

[bricky]

had a pierberg mas fitted today still problem with car it won,t change down throu gearbox(well it does for a while then won't) but when you switch cars engine off and restart the car it works again for a while
Q does the cars diagnostic need resetting so the malfunction will be taken off so car will function properly?
many thanks
bricky

 

[Xtractorfan]

No the MAF should auto reset on restart, the fault will still be logged tho, have you had your battery voltage checked

 

[bricky]

hi m8 no not had that checked but 5wks ago battery went flat light left on kids hey i have just read another post and read something about air flaps getting choked up on the intake manifold ?

 

[bricky]

forgot to mention theres a lot of black smoke on aceleration

 

[Xtractorfan]

Yes they do there is a lever under the manifold and you can get someone to rev the car and check if its working..

 

[Xtractorfan]

black smoke several causes blocked air filter worn injectors also check the EGR valve is operating ..

 

[bricky]

and how does this work ?
by vacuum ?
electric switch ?

 

[bricky]

wot is egr valve? and where is that located?

 

[Xtractorfan]

You will see the EGR valve actuator just behind the fuel filter bolted onto the inlet manifold ..it has two vacuum pipes fitted to it..remove the three torx screws ..a tiny bit fiddly.. and remove the actuator..now liberally sparay as much wd40, ts10 or whatever freeing oil u have into the manifold opening let it sit for ten mins and same again refit the actuator valve and start the car up ..clouds of smoke and freedom..I hope..

 

[bricky]

hi m8 found the lever under the manifold it had cme off put it back but car only revving to 3000 is the car in limp mode will resetting sort that out?
many thanks
bricky

 

[bricky]

hi m8 found the lever under the manifold it had cme off put it back but car only revving to 3000 is the car in limp mode will resetting sort that out?
many thanks
bricky

turned the car off and waited for a while it then reset itself ,the egr valve removed that very choched up in the side with 2 vac pipes sparyed wd in the other side but there is a valve inside in moves freely but the prob lies with linkage underneath manifold it keeps popping off when been for quick drive and seems to be sticking cant see how to get inside to free it sprayed the linkage and put together it moves when being revved but dont know weather it should move all the way when on full revs ?so think new linkage mybe the way forward looks like a nightmare to do, is this mb part only?and is it expensive? many thanks
bricky

 

[television]

You will see the EGR valve actuator just behind the fuel filter bolted onto the inlet manifold ..it has two vacuum pipes fitted to it..remove the three torx screws ..a tiny bit fiddly.. and remove the actuator..now liberally sparay as much wd40, ts10 or whatever freeing oil u have into the manifold opening let it sit for ten mins and same again refit the actuator valve and start the car up ..clouds of smoke and freedom..I hope..

Sorry the EGR valve must sit in the exhaust, sure the outlet feed back into the inlet

 

[bricky]

thanks for info need to get a linkage bar tomoz and take it from there this one keeps popping off at manifold end where the arm near the centre to the valve

 

[bricky]

still got this problem with car won't kick down when engine warms up usually 10 mins replaced maf with pierberg found a linkage arm from mixture setter come up so replaced opened up the egr valve and cleaned out (very coked up) but still got problem? on accelration there is a load hissing noise only does it under load not on stand still any suggestion or advice pls
many thanks

 

[Xtractorfan]

Hissing noise would point to the turbo hose being split or even the intercooler, you have to remove the lower front undertray to have a look at the hose/intercooler..chock the wheels and make sure the car is in park and get someone to rev the engine whilst you check where the hissing is coming from

Check this link for the hose and intercooler
http://www.detali.ru/cat/oem_mb2.as...GA=722.626&CT=M&cat=65C&SID=09&SGR=075&SGN=02

 

[bricky]

cannot hear it when revving only under load (when driving) sounds like a dump valve gone wrong?

 

[bricky]

did wot you said took under trays off and intercooler hose popped out put it back in and clamped ap took it for a drive still hissing and hose still in when sat inside the car it sounds like its comimg from inlet manifold area had someone rev it for me whilst i listened to where it is coming from but can't here anything it only does this hissing noise when driving ?????
much help needed if can't sort it may have to go in to garage again