w124lk

Hi

These cars just keep giving trouble im afraid.
The motor is an M111.960 in an E220. Problem now is when I start the car it cuts out shortly and the engine shakes like its not getting proper fuel or not burning fuel properly. I can smell a strong fuel smell from the pipe too ?? After the engine is warm it starts perfectly. First start in the morning it cuts out on first two attempts. Here's a video after two cut outs... this is the third time starting: Note the engine idles off strangely? I'm not applying gas at all when those rpms go up?!


I just recently replaced my fuel pressure regulator. That fixed my long cranking issue as the old one was leaking fuel into vaccum line and flooding. *I also replaced the spark plugs with Bosch exact part no. however the replacements have "china" stamped on them. Could it be these spark plugs thats causing this issue? I seriously cant think of anything else?
The fuel pressure regulator replacement was a genuine Germany Bosch one.

The following have been replaced recently: brand new genuine engine wiring harness + coil harness, genuine Bosch fuel pump, genuine fuel filter, new crank position sensor. These were replaced to fix a previous issue. I dont want to spend more money without exactly knowing what this stalling issue is now?

Any ideas would be great. Tnx!

Plutoe

Do you have any electronic diagnostic tools!!---if no find someone with a set

optimusprime m1

The rubber coupling sandwiched under fuel metering head may be split .It could be lots of things .Check all fuses, if they are white metal material replace them with co[per ones also clean up the contacts points in the fuse box, that the fuse sits in
And check all the earth leads on the body, remove them, clean body up, and grease and refit .And any part with china on throw out .Replace with bosch , or beru .Use none resistor spark plugs . Come back after you go through this check list.

w124lk

hi optimus. could you please explain about the rubber coupling you speak of ? (this model is not carb) where abouts should i be looking? tks
the spark plugs i bought were Bosch branded spark plugs however they are manufactured at the China plant. hence they have china embossed on the housing. they came in a Bosch packet. i put my old ones back in for now.
i pulled apart my OVP relay and everything looks fine to me?? probably isnt that then. fuses also look fine?

i pumped a full tank and added a bottle of total system cleaner. i through about half the tank now.
im thinking its fuel related. quite strangely this problem started after i renewed my fuel pressure regulator.

w124lk

I did re-solder a broken joint on the OVP relay about a month ago. i cant notice any broken connections at the moment.

optimusprime m1

The coupling in question is sitting on top of inlet manifold the very bottom part of the fuel distributor and metering unit .I will put a picture up for you.

optimusprime m1

I was checking this out just to find the part is not not fitted to your engine .I think this is down to the fuel distributor. . You need to do a pressure test on the fuel supply, It should hold pressure after 30 mins 0f shuting the engine down .Not electrical or it would backfire .Dont know anything about you engine ,its new to me .All i can do is use the internet to get answers .I will come back to you if i find information to help .

optimusprime m1

124 I hope your car is a W124 ?
Now my check was to ask if you have a EGR valve .
If so it can carbon up inside ,remove it and clean the little pintle inside .The vacuum pipe will need removing .
Now look at all the vacuum pipes if i have not said this before do it again see pics .

optimusprime m1

W124 Did you look at the throttle body see picture . This to has bad known insulation faults ..But how did the wire thet exits the look like marked in red ,,..This to can disintigrate like the other wires in the engine compartment .

w124lk

Hi optimus. i dont think my engine has an egr valve. i could be wrong though. yes it is a W124. it has the M111.960 engine which is a 2.2 litre. I had a look at the wire on the throttle body but i cant see anything to assume wiring is good or bad?

optimusprime m1

Dont think it can be seen its inside the black cover that covers the wires ,.
I could only find one post about your M111 And it said it had this egr it could be tucked away in some place out of view. What about looking to see if the little micro switch on the bowden cable that opens and close the throttle is working .

w124lk

hi optimus. when the vehicle is off there is a miniature play between the throttle and this micro switch you mention. i presume that's normal? if i fiddle by applying a little pressure with fingers then i can hear the switch click.

optimusprime m1

w124 i dont know what gap as to be there on the switch ,but fill the gap with paper and try it .

w124lk

shall try and see optimus

w124lk

hi optimus.i believe this is what you were referring to?
is this how it should be?
you can hear the clicks :S

optimusprime m1

The trottle unit on the motor you have is electronic you can see the wires going in to the side ,. Dont think you can work on them .They have to be sent off for a rebuild . But if she runs ok when its warm then it could be a cold start problem . On the side of the engine do you see a engine temperature sensor it could be stuck .Have a good look at the wires and the plug on the top . If it is stuck it sends the wrong information to ecu The sensor tells the ecu i am cold and it will enrich the mixture. But if stuck in the other possition will weaken the fuel mixture .. So you can be starting with no enrichment due to the wrong info sent to ecu..

w124lk

it runs fine when warm. i believe it is a cold start problem. i can see a sensor on the exhaust manifold however thats O2 sensor

optimusprime m1

The sensor will be going in to the water part of the engine .I have a manual for the w124 but wont cover your engine .

w124lk

tnx optimus. removed and cleaned all three sensors but no luck ;( on this engine they're at the front of the head below the valve cover

optimusprime m1

Take the plug off each one a a time, and try it then . See if any change.

w124lk

problem is still there... i think it might be the coolant sensor though... because after engine warms up it runs fine. just stalls on initial cold start only... shakes starves fuel smell then cuts out after about one min runs fine

optimusprime m1

I would buy no new parts as yet ..First get a fuel pressure testing kit off ebay, in the uk they are £15 with all the bits to check out the fuel pressure in the fuel distributor. I am thinking its in there that you problem lies ,thats if you can smell fuel .I will come back to you .

w124lk

i dont think this model has a fuel distributor.

optimusprime m1

No maybe not but you still need to read the pressure .
Now to help you more go to Google search put in the search box =
Mercedes E220 M111-960 Hard Start Cold OK Hot ..
A lot with this problem , and it might help you .Let me know , it will give you some idea what to look for .I am only doing the same search in google .

w124lk

noted. i did initially think that it was fuel pressure related but now i think it is sensor related. in fact i think you were right before with the coolant temp sensor. the symptoms do relate

i also researched with those keywords. been through most threads pal