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Author Topic: Ignition Problem  (Read 2958 times)

Offline Mk2Kezza

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Ignition Problem
« on: 04 September 2013, 17:50 »
Following the melting of the knock sensor wire last night I now have no ignition battery and oil light. The water light flashes and the handbrake warning light come on in position 1 but not the other two. Also the fuel pump does not prime. There is a faint flash of the bat light light and that is it.

I bridged the starter to the battery and the fuel pump / ISV both prime.

I bridged the RED and BLACK wires on the back of the ignition switch and it is the same as the first paragraph.

Any ideas where to look or what it may be?

Cheers again.
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Offline gazareth

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Re: Ignition Problem
« Reply #1 on: 04 September 2013, 18:10 »
I have never heard of a knock sensor wire catching fire because the ignition timing was out lol. I would check all engine and body earths first.
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Offline oakgreener

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Re: Ignition Problem
« Reply #2 on: 04 September 2013, 18:21 »
Following on from previous post. It seems a main earth has come adrift and it is finding an earth path via the knock sensor
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Offline gazareth

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Re: Ignition Problem
« Reply #3 on: 04 September 2013, 18:34 »
yeah that's exactly what I was thinking. had a similar problem on my mk1 escort many moons ago when the throttle cable caught fire at a petrol station of all places.
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Offline Mk2Kezza

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Re: Ignition Problem
« Reply #4 on: 04 September 2013, 19:48 »
Thanks for the quick replies. I've removed relay 32 and the battery light comes on but a little feint. Anyone know why? Knackered relay maybe?
Still won't turn over though...
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Offline weazgti

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Re: Ignition Problem
« Reply #5 on: 04 September 2013, 19:56 »
What wire did you bridge on starter to make fuel pump prime? How did it do that?
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Offline Mk2Kezza

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Re: Ignition Problem
« Reply #6 on: 04 September 2013, 20:30 »
I saw an earlier post by Rubjonny and he mentioned doing that. The +ve battery to the spade connector on the starter. I may be mistaken and it is only the ISV buzzing but it sounded like the lift pump priming.
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Offline Mk2Kezza

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Re: Ignition Problem
« Reply #7 on: 07 September 2013, 09:29 »
You're spot on lads,

It is an earthing problem. I ran the jump leads from the battery negative to the body and block and all the ignition lights came back on. Just need to find out which earth wire/wires are the problem.
Does anyone have a location list of where to find them so I can systematically check them...

Cheers
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Offline GeordieChap

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Re: Ignition Problem
« Reply #8 on: 07 September 2013, 12:18 »
Ground at back of cylinder head to coil, ground behind battery, ground on passenger side wing to bonnet, ground on gearbox, and I think there's a ground in the instrument panel and also one on the fuel neck, might of missed one though
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Offline weazgti

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Re: Ignition Problem
« Reply #9 on: 07 September 2013, 15:46 »
One inside above bonnet pull and earth claw above pedals
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