Car Starting Problems
BMW 3-Series

What is the problem if a BMW 320i won't start and has no spark at all?

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Wiki User
2014-01-25 15:17:38

1. It sounds like you may have a Flat Battery

2. Dead Crankshaft Sensor

3. Blown Starter Fuse or Relay

4. Dead Immobiliser

5. Factory ground cable???

Using a test light, clip check for ground at coil (-). If ground

is present with the key in the "on" position but goes away when

cranking, it is most likely that the anti-theft system (imobilzer)

is taking ground away from the coil to prevent the car from being

started. If this is the case, go to the alarm module (below the

dash to the left of the steering wheel) and locate the large

connector for it (leave it plugged in). If you jump wire the upper

and lower far right wires, the car should start. If the car now

starts, you have a fault in the anti-theft circuit.

(Factory Ground Cable)

I had my 1982 BMW 320i for 17 years and the last few years

intermittently I would turn the key and nothing at all , Just would

not start,. It could be the very first thing in the morning or

after coming out of an hours shopping at the market. Wouldn't make

any sound at all when I would try to start it. And of course It

would never happen when it sat at the mechanics. I was so fed up I

had some time and drove to my long time friends shop, and low and

be hold with gods help I'm sure...It happened! After testing a few

things under the hood he asked me to step out of my car and raised

it on the rack, he walked under the rear wheel and said yep here's

the problem...The Factory Ground Cable was lose and full of dirt

and grease and was not grounding. He cleaned all the dirt and grime

off and tightened the bolt and it never happened again. Mystery


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