whats my symptoms point to

[japimport]

my car loses power while driving, and then rev counter surges eratically, ive already posted about my problem and i cant seem to get it fixed. its happening every day now, ive being on the net searching everywhere and whats coming up is it could be the alternator, fuel pump,or fuel pump relay so im going to take all these parts of my other c class w202,and see what happens would i be going in the right direction by doing this,if someone asked you, my car loses power while driving and idles eraticly,whats the first thing that comes to your head,please post your ideas because ive to go back to the drawing board, and start again, with the problems im having, thanks as always for your help, regards thomas oh my car is a c200 95 123,000 miles

 

[roofless]

it could be the msg control unit on the way out 140 in the link http://www.detali.ru/cat/oem_mb2.as...417717.418&CT=F&cat=44V&SID=54&SGR=080&SGN=06 it's under the washer bottle...

 

[roofless]

just looked at your old posts & the regeneration valve springs to mind too 65 in the link http://www.detali.ru/cat/oem_mb2.as...417717.418&CT=F&cat=44V&SID=47&SGR=060&SGN=04 you can feel it pulse when the car is up to temp ...if you don't pull the vac pipe off at the throttle body & blank it off & it will run as normal

 

[japimport]

just a quick question what is the pulse like when up to temp

 

[roofless]

just a quick question what is the pulse like when up to temp

you feel a steady click rhythm

 

[roofless]

the regeneration valve looks like this & the msg or pms unit looks like this

 

[japimport]

thanks a mil

 

[japimport]

thanks for the help so far,ive a c200 automatic 95 as a donor car will the pms go in to my 95 c200 manual i wont be in work saturday so ill give it a go again, and ill change the regeneration valve while im at it and hopefully ill get somwhere

 

[roofless]

thanks for the help so far,ive a c200 automatic 95 as a donor car will the pms go in to my 95 c200 manual i wont be in work saturday so ill give it a go again, and ill change the regeneration valve while im at it and hopefully ill get somwhere

you need to check the part number & as far as i know you could have a bosch or a siemens part ........the regeneration valve will prob be ok

 

[C220GJS]

If your idling is erratic I would suggest swapping over the OVP relay from your donor car as this is the most common symptom of the relay breaking down and if it is a Seimens part it is almost certainly faulty.

 

[japimport]

thanks for the replys,tommorow im up at 7am, so ill have a go and try to sort it out, im also puting a new drivers door on, so ill be busy, ill keep yous posted hopefully all will be well thanks again for your help i really apreciate it

 

[japimport]

ok took roofless advice,and had a look at the re generation valve and it wasnt connected to the tube that comes from the throttle body,so maybe thats what it was all along, im going out for a drive now, so ill see how it goes

 

[japimport]

ok went on a long drive yesterday, and it happened about 5 times, while going motorway speeds, so this morning i changed the fuel pump,fuel pump relay,fuel filter and regeneration valve and its still not going away,its a little lumpy on idle aswell i was trying to change the cps aswell couldnt get at it any tips on this,so anyone have more ideas for me im totally ouy of ideas thanks.

 

[roofless]

ok went on a long drive yesterday, and it happened about 5 times, while going motorway speeds, so this morning i changed the fuel pump,fuel pump relay,fuel filter and regeneration valve and its still not going away,its a little lumpy on idle aswell i was trying to change the cps aswell couldnt get at it any tips on this,so anyone have more ideas for me im totally ouy of ideas thanks.

it's looking more like the pms unit to me when it's faulty it take out the coil packs & this could be the cause of the idle prob ...i had this with my e200 with the same engine & it would run for days even weeks then do it 4 or 5 times in a day at will & without any warning ..........still i hope i am wrong

 

[japimport]

oh i was going to change that aswell,but the pms unit in the donor car had no mercedes details on it i think it was a refurbished one so i dont know if itl work in mine,it has no writing on it at all not even a part number i might have to leave it in to a mercedes specialist im totally stumped

 

[roofless]

it can be very hard to find the fault without star ect do you get a miss fire up to 3000rpm

 

[japimport]

no nothing at all, when it happens the revs drop under 1 and the engine shakes violently and i turn the engine off,and starts back up first time everytime,as if nothing happened its a head scratcher

 

[roofless]

if you pull the two large plugs out & look for any sign of water damage esp on the tips of the pins in the plugs ...a rusty brown color

 

[Xtractorfan]

Does your car have a cat and if so have you checked it isnt blocked....had a very similar problem last week with an S40 T4 volvo, it belonged to my son and he sold it a few years ago and he bought it back recently..cos he always liked it...

 

[roofless]

Does your car have a cat and if so have you checked it isnt blocked....had a very similar problem last week with an S40 T4 volvo, it belonged to my son and he sold it a few years ago and he bought it back recently..cos he always liked it...

a good call sir