W124 E220 coupe ‘94 no spark or fuel

[LiviuP]

Hello
I recently bought a car that I always wanted(W124 coupe E220 petrol 1994), but unfortunately is a non starter.The seller told me that he had a mechanic over and suggested it could be the fuel pump( I believed him ).
Changed FP( twice ), relays, engine harness(£730), all fuses, disconnected and removed the after market alarm, new battery.
I noticed that FP will not engage with ignition unless I bypass the relay. I pulled on spark plug out and by earthing it with the engine to check for spark( nothing).
I’m guessing that is not getting starting signal from ECU, but on Haynes manual that I have is no diagram I could check.
If anyone could help it would be great.
Cheers

 

[LiviuP]

Forgot to mention that I had it started twice ( first time for about a minute and second time for about 15 minutes after just cut off)

 

[mattkh]

Are you saying you bought a new fuel pump relay and tried it?

 

[LiviuP]

Yes, all the above mentioned..

 

[WDB124066]

Air in the fuel line...?

 

[LiviuP]

Still no spark..... and like I mentioned previous.....it did start and run quite nice for about 20 min and suddenly cut off.....never started since

 

[WDB124066]

Something related to engine coolant temperature...

Do you have fuel to injectors now, long shot, sticky injector/s

Crank position sensor not working properly.

 

[LiviuP]

That is the issue! When ignition is on I should hear fuel pump engage but not on my case, unless the FP relay is manually bypassed ( done that and is engaging) ...
I have measured the crank and cam sensors resistance and they are within Haynes manual parameters ( so I rolled them out)...

 

[WDB124066]

Could it be a connection between the relay and the pump, do you have a genuine relay, the real thing or a will fit. I am not all that technical but if you really get stuck put an International call through to Harry at North Shore Car Clinic, New Zealand.

Superstar MB Forman at our largest Dealership in the day our cars were new - went out on his own, failing that try Byron, Autohaus, Auckland, was the Forman before Harry, They will see you right, drop them an email first if you like.... they will be on duty in 12 hours time.

 

[LiviuP]

Yes, to answer your question, brand new from dealership (£900 damage )MB same as engine harness.
I’m new on the forum and if you could direct me how to contact superstar mb that would be great

 

[WDB124066]

https://www.autohausak.co.nz/ Ask for Byron or email him.

https://www.nocowboys.co.nz/businesses/North-Shore-Car-Clinic- Ask for Harry or email him. Both of these guys respond better to a phone call, they get busy, but will help a stranger over the phone.

Both are in NZL if you are in a hurry otherwise someone on here may recommend people who honestly know their beans.

 

[mattkh]

How are you checking for the spark?

 

[LiviuP]

No offence mattkh but I’m looking for suggestions that could help me find the issue...like where the could I find the srs module ( crash sensor) that may be a possible non start cause.. etc
Cheers

 

[mattkh]

No offence mattkh but I’m looking for suggestions that could help me find the issue...like where the could I find the srs module ( crash sensor) that may be a possible non start cause.. etc
Cheers

I think you are on the right track because I had an Italian car it had a fuel-pump-cut-off switch if the car rollover.
Your car engine run for 20 minutes and then suddenly stopped.

 

[LiviuP]

Just come back from the garage, and for future reference the SRS module( crash sensor) on this model w124 is under centre console ( good 40 minutes to dismantle) in front of gear shift.
Unfortunately after disconnected still no luck.... Next step.... building a blink code reader and waiting for another service manual that I order ( hopefully it contains the right wiring diagrams) ....
And still welcome any other suggestions..
Cheers

 

[Doug1234]

Check all the ground locations , main one for most electrics is behind the instrument cluster
http://www.w124-zone.com/downloads/MB CD/W124/w124CD1/Program/ETM/ground_locations.pdf

 

[DREAMER NO2]

Silly but have you checked your fuses ? The gear selector holds a safety switch inside so engine only starts in Park .So waggle the selector leaver a few times and try to start it again

 

[Steve@Avantgarde]

I think you need to go back to the start on this one and start with some basics because you're posts are full of guesses and confusion.

If you haven't got fuel or spark I would say that its one of 2 possibilities:

Firstly there is an immobiliser rigged into the car somewhere designed to cut both. Being a 94 model I would guess you would have a remote key with the old IFZ immobiliser system...?? Same system fitted to the early 202s, we were forever removing the IFZs and bridging the system..The first thing I would do is check to see if your car has IFZ (MB can check the data card for you).

Or you have 2 faults and they are spinning you around in circles.

Surely you can check to see if you have 12v at the fuel pump on ignition pos2? Which I would start by going back to basics and checking for 12v feed at the pump on ignition pos2, checking that wiring first.

For no spark. these old 124s burn out the coils fairly regularly, as well as dizzy and rotor arm failures, so check you have voltage both in and out of the coil and good condition of the spark system. A slight crack not visible to the eye can send everything to earth.

 

[DREAMER NO2]

Are you replacing parts to the part number on the existing item . Dont fit any parts if the numbers are not exact .This might mean more work for you ,but remove the distributor and check the carbon brush in the centre of the distributor. But for fuel and spark to go off both together it might be the ecu problem .Ot two independant faults on each part .

 

[mioba]

OP where are you based