No spark - PeachParts Mercedes-Benz Forum

deep3375 · #1 01-17-2009, 02:59 PM

86 300e engine is just turning getting fuel but no spark can anyone tell me where I might start

pawoSD · #2 01-17-2009, 03:08 PM

Quote:

Originally Posted by deep3375

86 300e engine is just turning getting fuel but no spark can anyone tell me where I might start

Over Voltage Protection Relay, Coil, Distributor, Rotor, Wires, Crank Position Sensor, EZL Ignition unit (on fender)....problem is with one of those things most likely.

slk230red · #3 01-17-2009, 03:15 PM

Quote:

Originally Posted by deep3375

86 300e engine is just turning getting fuel but no spark can anyone tell me where I might start

If no spark, then I would verify that the rotor and distributor cap are good.
If they are, then I would check the Crankshaft Position Sensor. You should have around 680-1200 ohms. For the crank test you should have 1.5v AC at starter speed. This test is between terminal 7 (Center Pin) and 31d (Ground side) when you unplug it from the Ignition Control Module.

deep3375 · #4 01-17-2009, 06:26 PM

Quote:

Originally Posted by pawoSD

Over Voltage Protection Relay, Coil, Distributor, Rotor, Wires, Crank Position Sensor, EZL Ignition unit (on fender)....problem is with one of those things most likely.

It was stsrting just fine until I jump started it one day I replaced the fuse in the overload protection relay I'm thinking it night be the ign module I was wondering if they were interchangeable. Oh the cap and rotor is fine

stevebfl · #5 01-17-2009, 08:20 PM

Over voltage protection relay WILL NOT keep the engine from getting spark, nor will it keep it from running. It can effect starting cold, but the engine can run just fine without it.