Problem with starter E350 OM642
Thread Starter
Newbie
Joined: Dec 2024
Posts: 2
Likes: 0
Problem with starter E350 OM642
Hello, I have a problem. When I start the engine without waiting for the ignition to turn on, it starts normally, but when I wait 5-6 seconds for the ignition to turn on, it just clicks and doesn't start.
What would could be starter or EIS
What would could be starter or EIS
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
V6Diesel
Use a $150 Launch MB scanner to read chassis faults, then you'll know.
Could also be a relay in the front fuse box (fSAM).
Thread Starter
Newbie
Joined: Dec 2024
Posts: 2
Likes: 0
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
MBWorld Fanatic!
Joined: May 2018
Posts: 6,601
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Get a current clamp and a voltmeter.
Read the voltage and current consumption during :
01. Immediate crank to start
02. Ignition ON for 5-6 seconds and then crank.
The glow plug heater needs lots of power, easy 100 watts each cylinder.
So if your battery is weak, by doing 5-6 seconds wait, the battery amperage drain could be high enough to render no more enough CCA for the starter which will need
peak about 600ish amps for first 1/4 to 1/2 second of cranking from zero crankshaft speed or zero starter speed.
Typical cranking with starter already spinning is about 220 Amps for my 6 cylinder petrol engine.
Read the voltage and current consumption during :
01. Immediate crank to start
02. Ignition ON for 5-6 seconds and then crank.
The glow plug heater needs lots of power, easy 100 watts each cylinder.
So if your battery is weak, by doing 5-6 seconds wait, the battery amperage drain could be high enough to render no more enough CCA for the starter which will need
peak about 600ish amps for first 1/4 to 1/2 second of cranking from zero crankshaft speed or zero starter speed.
Typical cranking with starter already spinning is about 220 Amps for my 6 cylinder petrol engine.
Last edited by S-Prihadi; Dec 5, 2024 at 09:34 AM.
