E350 glow plug starting problem
Thread Starter
Newbie
Joined: Apr 2019
Posts: 2
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59 e350
E350 glow plug starting problem
Hello all, been having a problem starting my e class (59 plate) for a long time, last year I changed the glow plugs and still the same problem, on the forum I was told most likely it will be the relay as well which needs changing so I changed that but still the same problem, car would usually start after a few mins but the past few weeks it's got worse, it hasn't even started today and now the battery has gone flat, had rac come take a look a couple of days ago they said it's showing open circuit fault on all the glow plugs so he reckons there is a problem with the power to the glow plugs, any ideas guys? Thanks
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
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From: V E G A S
1922 Ford Model T / no OBD
That would make it OM642 engine.
You got me confused, becouse those engines don't have GP relay.
They do have module and bad module will fire CEL.
What code number it shows?
Still strange why it takes so long to fire even with bad module. When I had bad module, my engine still would fire up in 3 seconds in CA winter.
Than maybe you are in Siberia???
You got me confused, becouse those engines don't have GP relay.
They do have module and bad module will fire CEL.
What code number it shows?
Still strange why it takes so long to fire even with bad module. When I had bad module, my engine still would fire up in 3 seconds in CA winter.
Than maybe you are in Siberia???
Senior Member
Joined: Apr 2016
Posts: 457
Likes: 151
From: Phoenix, AZ
2016 E350 Sport 2WD
Open circuit as mentioned in the OP posting means that there is not a complete electrical circuit, and no electricity flows through the circuit. Think as in broken wire. It sounds very intermittent, connected, then disconnected, then connected again. You might try monitoring the glow plug circuit wires with your voltmeter to see if you can detect when and where (which wire/circuit) this occurs. It might happen so fast that you may not be able to see it on the DVM.
