I thought it was a starter motor but...

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hyjinx
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I thought it was a starter motor but...

Post by hyjinx » Wed 28 Nov, 2018 8:49 pm

Hi,

my w124 since i bought has had on the odd occasion times when you turn the key and you get all power but absolutely no crank no ticks just nothing and then next try it normally kicked. Until 2 weeks ago it did it a few days in a row. then nothing every go.

So i thought it may have been the starter so i took it out and tested it and its spinning and moving as it should.

Possible other causes? Ignition wiring? I went through fuses and didnt seem to have any blown. I havent refit the starter yet but thought id ask and see if anyone has a possible idea or things to check out.

Cheers
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John Green
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Re: I thought it was a starter motor but...

Post by John Green » Thu 29 Nov, 2018 1:02 pm

No real need to have pulled the starter. Follow the wires from the starter and you should arrive at a terminal block. You can test most functions from here. There is a purple/mauve wire there maybe with a white stripe. You need to check if it has 12vts when you have the ignition switch in the crank position. If there is no 12vt signal, the issue is either switch or some electrical gremlins in the dash.

If you have a 12vt signal then you need to double check all connections are clean and tight, before jumping in and pulling the starter. A loose earth from the body to the engine might be the issue, likewise poor connections in the terminal block. You can temporarily resolve a poor earth by connecting a jumper cable from the negative terminal connector on the loom to a good earth point on the engine.

Also remember that you can have 12vts, but not enough amps to make it all happen. This is usually caused by a poor contact somewhere along the way.
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Re: I thought it was a starter motor but...

Post by Henry Schuman » Fri 30 Nov, 2018 1:47 am

If you have an automatic Transmission Make sure the shift lever bushings/ rear motor are not worn out and the shift lever is not causing all your problems. Push forward on the lever or put it in Neutral and try starting .
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hyjinx
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Re: I thought it was a starter motor but...

Post by hyjinx » Sun 02 Dec, 2018 6:24 pm

Awesome info thanks guys.

I will be back on it this weekend so hopefully i can sort the bugger out. Ill reinstall and go through those checks. I did think it could have been the shifter at first cause it was intermitten so ill hopefully find the issue earlier rather than later.
89 - 230E "Meghan Mercle"
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Ivanerrol
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Re: I thought it was a starter motor but...

Post by Ivanerrol » Sun 02 Dec, 2018 8:08 pm

Try wiggling the shifter in Park and then in neutral while turning the key. That’s generally a good indication that your shifter bushings are not up to scratch.

Bushings are very cheap but a PITA to change without the special tool.
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hyjinx
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Re: I thought it was a starter motor but...

Post by hyjinx » Sat 08 Dec, 2018 4:29 pm

Well thanks all the info givers :D

I reinstalled the starter, checked the mauve/white connection for 12v ,proceeded to clean up some of the earths in engine bay, under the car and the ones in the boot for the tailights.
Trying to start after each event, no change, i think put it in neutral and held the shifter the right and it started.
After turning it off i just left it in park and its just starting now.

So im thinking its the bush in the shifter lever but im still abit non the wiser lol.

So either way its starting and ill next look to getting that changed to eliminate it from the equation 100%.

Thanks again :notworthy:
89 - 230E "Meghan Mercle"
71 - 280SE "Browntown" R.I.P.
71 - 280SE 3.5 "Seedyz" R.I.P.

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