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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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suddenly starter motor wont engageViews : 2470 Replies : 39Users Viewing This Thread : |
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Feb 12th, 2019, 13:04 | #1 |
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suddenly starter motor wont engage
Hi all,
having just got my 960 24v estate MOTd, the next time I went to use it, turn the key and nothing. It not the battery - thats fine and also I tried fully charging it - no difference. I read somewhere else about dodgy ignition barrel - well that was already replaced once and also if I put the headlights on, they turn off when the key goes from pos 2 to start position so I figure that's fine? The only sign of something going to be amiss was the day I took it to the MOT, when I started it initially there was a delay of a second or so when nothing happened and then it started as normal although the starter motor sounded a little sluggish. Could it be the starter motor? do they suddenly fail in this way? Or could it be something else? Im feeling a bit gutted because this has always been such a reliable car, dont recall there ever being a time it has failed to start (even when the fuel pump was playing up) thanks Aaron Last edited by 2V8s; Feb 12th, 2019 at 13:06. |
Feb 12th, 2019, 14:26 | #2 |
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Is it manual or auto? First thing i'd check is that the exciter/trigger wire (usually white/red) hasn't come off the starter terminal.
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Feb 12th, 2019, 18:58 | #3 |
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Highly unlikely the wire has fallen off. However, if you can see the starter motor (not sure of layout on that engine), try this:
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Feb 12th, 2019, 19:27 | #4 | |
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Could simply be a worn inhibitor switch or even just dirty contacts. Still worth checking the exciter wire, if it's where it should be, not broken, clean and tight connection, give Ash's idea a try. Also worth checking the relays are all pushed fully home in the electrical box behind the ashtray and/or under the bonnet depending on which model you've got - a loose start relay will also cause this problem.
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Feb 13th, 2019, 08:36 | #5 |
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An alternative source could be the engine earth strap!
Years ago I had a Fiat Mirafiori that refused to start; I became adept at starter motor removal and replacement but couldn't work out what the problem was as the starter was fine when off thecar. It turned out that the earth strap between the rocker cover and bulkhead had an air gap. Remade with aircraft-specification braided cable and - problem solved.
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Feb 13th, 2019, 09:50 | #6 | |
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Feb 13th, 2019, 10:21 | #7 | ||
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Quote:
Quote:
There'll be an over spec voltage drop reading if the earth strap is defective.
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Feb 13th, 2019, 11:24 | #8 |
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The jump lead does that and proves the starter at the same time if it is an earth strap fault.
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Feb 13th, 2019, 13:35 | #9 | |
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Using a multimeter to measure voltage drop on the live and ground side will identify many more potential faults though so a combination of methods is always handy.
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Feb 13th, 2019, 15:16 | #10 | |
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