1993 Mercedes 400 E no spark!
06-16-2017, 03:28 PM
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1993 Mercedes 400 E
1993 Mercedes 400 E no spark!
Hello everyone. I'm new here so I hope I'm posting in the correct forum.
I have a 1993 Mercedes 400 E that while running beautifully in an instant started to run one what felt like 4 cylinders.
I pulled it into the Mercedes specialist. The said they tried to swap between the two coils to determine which one was bad and then the car lost all spark.
They diagnosed it as two bad coils, Caps and rotors, and plug wires and wanted $2200 to replace them all.
I decided to take on the project my self to hopefully try and save money.
COILS:
Both coils have 11.8 Volt going to them with the ignition on.
Both coils have 10.5 Volts when cranking the engine
Both coils ohm out between the + and - at .5
Both coils ohm out between the + and output at 11,000
I "DO NOT" have spark coming out of my coils :-(
CRANK SENSOR
Crank sensor wire ohms out at 836
Crank sensor show a pulse on the multimeter when cranking
Distributor caps and rotors.
I pulled both caps and rotors. Both looked very clean with little to no corrosion in either cap.
EZL:
I put a used EZL in and have the exact same result of no spark.
Thanks for any advise!
Does anyone have any suggestions?
One thing I have not been able to test is the power to the EZL. Does anyone know what cable is the power source and what it should read?
I have a 1993 Mercedes 400 E that while running beautifully in an instant started to run one what felt like 4 cylinders.
I pulled it into the Mercedes specialist. The said they tried to swap between the two coils to determine which one was bad and then the car lost all spark.
They diagnosed it as two bad coils, Caps and rotors, and plug wires and wanted $2200 to replace them all.
I decided to take on the project my self to hopefully try and save money.
COILS:
Both coils have 11.8 Volt going to them with the ignition on.
Both coils have 10.5 Volts when cranking the engine
Both coils ohm out between the + and - at .5
Both coils ohm out between the + and output at 11,000
I "DO NOT" have spark coming out of my coils :-(
CRANK SENSOR
Crank sensor wire ohms out at 836
Crank sensor show a pulse on the multimeter when cranking
Distributor caps and rotors.
I pulled both caps and rotors. Both looked very clean with little to no corrosion in either cap.
EZL:
I put a used EZL in and have the exact same result of no spark.
Thanks for any advise!
Does anyone have any suggestions?
One thing I have not been able to test is the power to the EZL. Does anyone know what cable is the power source and what it should read?
