I HAVE A M REG E220 I WAS STITCHED UP WHEN I BOUGHT IT I HAD TO HAVE A NEW IDLE VALVE AND A NEW CAT, BUT THE CAR IS STILL HAVING IDLING PROBLEMS I WAS TOLD THIS IS HOW MERCEDES RUN ITS NORMAL, I AM A WOMAN BUT I AINT STUPID. I ALSO HAVE A PROBLEM WITH THE FUEL PUMP SOMETIMES I CANNOT HEAR IT PUMPING AND THE CAR WILL NOT START, THEN ALL OF A SUDDEN IT GOES, ANYONE GOT ANY SUGGESTIONS AS THE CAR IS NOW STUCK IN MY DRIVE LOOKING GOOD BUT NOT RELIABLE ENOUGH TO USE. PLEEEASE HELP THANK YOU.
IDLING AND FUEL PUMP PROBLEMS
- Thread starter chazgav
- Start date
LNM
Senior Member
STOP SHOUTING. Type in normal, calm, collected, non-hysterical lower case + people will probably be a bit more willing to help.
jberks
Senior Member
- Joined
- May 12, 2004
- Messages
- 11,153
- Reaction score
- 41
- Your Mercedes
- Jaguar XF 3.0 S, LR Freelander 2, Fiat 500 & Fiat Panda
Hi,
My N reg C220 was always a bit lumpy at idle Bought 3 years old and 19k miles, and I was told it was normal too. I'm afraid I never got to the bottom of it. Runs great other than that though. If you just replaced the cat, you got a year longer out of yours than we did with ours. I'm not a mechanic but if the pump randomly fails to kick in on startup, I would be looking for a sticky relay. They are lovely motors when they run properly but it sounds like yours may have been a little unloved. Worth persevering though.
good luck,
Julian
My N reg C220 was always a bit lumpy at idle Bought 3 years old and 19k miles, and I was told it was normal too. I'm afraid I never got to the bottom of it. Runs great other than that though. If you just replaced the cat, you got a year longer out of yours than we did with ours. I'm not a mechanic but if the pump randomly fails to kick in on startup, I would be looking for a sticky relay. They are lovely motors when they run properly but it sounds like yours may have been a little unloved. Worth persevering though.
good luck,
Julian
Spike
Senior Member
Hi Cazgav - Welcome to the foruum 
Firstly, I would check your fuel pump relay... Obviously check the connections for corrosion etc and since they commonly go on W124''s. It might be best to "borrow" one from a donor car for a while as a test as they are not exactly disposeable items. (about £70 from recollection)
If that doesnt do the trick, it may in fact be your fuel pump itself - not difficult to replace and not expensive - just dont smoke while your doing it. (Eurocarparts or German & Swedish) Whilst you're down there, you may as well replace your fuel filter at the same time.
The above may also be the cause of your idling problem but without further information on what the symptoms are, its hard to tell....only to say that idling/stalling problems are often caused by the OVP relay.
My advice would be to find a respected Mercedes independent garage who know their stuff. The right person will be able to diagnose and sort the glitches you are having with ease and you will be left with a very desireable *reliable* car. :wink:
If you let us know the area you live, maybe someone here can recommend somewhere.
Firstly, I would check your fuel pump relay... Obviously check the connections for corrosion etc and since they commonly go on W124''s. It might be best to "borrow" one from a donor car for a while as a test as they are not exactly disposeable items. (about £70 from recollection)
If that doesnt do the trick, it may in fact be your fuel pump itself - not difficult to replace and not expensive - just dont smoke while your doing it. (Eurocarparts or German & Swedish) Whilst you're down there, you may as well replace your fuel filter at the same time.
The above may also be the cause of your idling problem but without further information on what the symptoms are, its hard to tell....only to say that idling/stalling problems are often caused by the OVP relay.
My advice would be to find a respected Mercedes independent garage who know their stuff. The right person will be able to diagnose and sort the glitches you are having with ease and you will be left with a very desireable *reliable* car. :wink:
If you let us know the area you live, maybe someone here can recommend somewhere.
alexandrupop
New Registration
random fuel pump starting
had the same problem, it's from the ovp (over voltage protection). It is a silver relay located under a cover behind the batery.
had the same problem, it's from the ovp (over voltage protection). It is a silver relay located under a cover behind the batery.
As a member of ourMercedes Owners' club, you will enjoy numerous savings on an expanding range of services including, Insurance, Parts and Servicing, RAC Membership plus much more.MBOmembers can save around £200.00 a year. You can join from as little as £30.00 and start to enjoy these savings immediately. You receive our monthly magazine and free classified ads when you decide to trade up a model.