mercedes benz 230E ignition problem

[nikmahmud]

I had facing problems on my car when it doesnt work.There was voltage at
the coil but there was no spark at the plug.I had replace the distribution with a new one but it wasn't work.Could it be the coil or the ignition problem.
Hopes for any one helps on this matter.

Thanks

 

[television]

On the coil you have the 2 small terminals. the + normally has a constant 12v with the ignition on. the other small one marked - the wire goes to the contact breaker (photo cell ) this is an electronic switch that grounds this terminal, as this electronic switch opens, this produces the high voltage in the secondry of the coil to produce the spark. By slowly turning the engine over the - terminal will have 12 volts on it during the time that it is not grounded.

If this is not happening, then the photo cell or amp is at fault.

malcolm

 

[nikmahmud]

Thanks,
hte voltage seems to be there but when I start pressing the engine the voltage seems to drop and there was no spark cming out from the plug.
the au refer is it the ignition module.
thanks,
nik

 

[television]

If using a digital meter you could have problems measuring the - terminal owing to the slow gate times of a digital meter. An anolgue meter would show if the photo cell/electronic ignition module is working as the engine is cranked.
not easy to make this sound easier.

malcolm

 

[nikmahmud]

Thanks,
I will try it this morning as now it is 3.45am
However is there any other possibilities rather han the ignition module, how about the coil itself?
nk

 

[television]

Thanks,
I will try it this morning as now it is 3.45am
However is there any other possibilities rather han the ignition module, how about the coil itself?
nk

to test the coil you would need to remove the neg - lead from the coil.

You will need a 2.2mfd condenser 250v dc working. join one end to the -on the coil and the other to ground. (chassis). turn the ign on and ground the -terminal to chassis and as you remove the ground lead there will be a nice fat spark if the coil is good


Malcolm

 

[Mikesmerc]

Have an 88 230E which the ignition module was faulty, the heat conductive paste at the back of the unit dries up and eventually leads to the unit failing and a non starter. Wasnt too bad on price from what I can remember
Mike

 

[nikmahmud]

dear malcom.
sorry ,what I have wrote just now was already written on the top line of your answer which I didn't realised it .OK, I'm going to try it now.
Thanks,
Nik

 

[nikmahmud]

please help me on the diagram if anybody had .
Wiring from ignition switch to the starter, to the alternator and to the ignition coil if possible.

Thank
Nik

 

[nikmahmud]

it seems that no one had an answer on this.
Please aknowledge as soon as possible if anybody had an idea, on how the original ignition wiring from the switch until the plug.I need to trace what are the other fault besides the coil.(mercedes 230E)
thanks
Nik

 

[nikmahmud]

I tried to replace the coil but it still doesn't work
could it be the ignition control board, anyone had an idea.

Thanks
Nik

 

[nikmahmud]

Can anybody help me?
I had replaced almost all the parts, starting from the plug, then the distribution, the coil and the ignition module but still there was no sparking at the plug.There was a supply 12v from the switch to the coil but still there was no sparking at the plug.

Thanks,

Nik

 

[ALAN@ECUCLINIC]

try not to rely on mercedes wiring diags as twice this week i have found them to be totaly wrong and misleading especially where the ml starter circuit is concerned,it does not go through the ecu as shown as the new set of diagrams will confirm.( we are , i hasten to add refering to diesel)