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Old 23 March 2008, 18:37   #11
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I had a mini that did this years ago in the end.. I narrowed it down to some shorts and power loss in the HT side causing failed ignition, all you need is a slightly worn HT lead to a plug, or as JW said ..the king lead, and the whole lot can stop , and not just misfire.. check they are all isolated perfectly, and I mean not touching anything close at all, as the spark will jump a good bit if the lead has a crack in it
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Old 23 March 2008, 19:32   #12
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I had a mini that did this years ago in the end.. I narrowed it down to some shorts and power loss in the HT side causing failed ignition, all you need is a slightly worn HT lead to a plug, or as JW said ..the king lead, and the whole lot can stop , and not just misfire.. check they are all isolated perfectly, and I mean not touching anything close at all, as the spark will jump a good bit if the lead has a crack in it
Start it up after dark and lift the bonnet. You will see any sparks.
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Old 24 March 2008, 05:47   #13
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Start it up after dark and lift the bonnet. You will see any sparks.
I did this last night and no sparks seen. I'm going to buy a set of HT leads and a coil if I can find a local motor parts store that's open today and see if that helps.
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Old 24 March 2008, 14:16   #14
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Did a few more checks after changing a couple of other things and breaking down and being towed home by the missus it seems the engine is permanatly dead now, which is a good thing I guess as it should make diagnosis easier.

I checked the spark at the "King" lead (Dizzy end) by connecting an old plug and earthing it out and all seems OK "Sparks"! I checked each of the HT leads to the spark plugs and am not getting anything, this means the problems with the dizzy cap and rotor arm or the HT leads....Yes?

These two items where replaced two weeks ago and I wouldn't have expected them to fail so soon, but I stripped off the cap which looks OK and the rotor arm again looks visibly OK. I started to check for continuity and found it OK on the cap (buzzed through OK) but when I checked out the rotor arm I was getting a high resistance between the center and outer terminals. Now I'm guessing here as I'm no electrican but is there a Capacitor or condensor between the inner and outer parts of the rotor arm, there is some sort of resin btween the two?

The other thing that I noticed was the amount of gap between the rotor arm and the 4 terminals in the cap (approx 3mm) this seems excessive, am I right to think this?

Summary of things I've changed this weekend.

King lead
Coil
Checked all wiring
Relays
New spark plugs two weeks ago
New Distibuter Cap and rotor arm two weeks ago.
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Old 24 March 2008, 15:09   #15
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Andy

I'd say you found it.

Unless I'm completly wrong there should be no resistance across the rotor arm, so it looks like its failed.
The gap also sounds a bit too big to me.

Bet they are pattern parts!

Nasher.
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Old 24 March 2008, 18:54   #16
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Andy

I'd say you found it.

Unless I'm completly wrong there should be no resistance across the rotor arm, so it looks like its failed.
The gap also sounds a bit too big to me.

Bet they are pattern parts!

Nasher.

Well, let's hope so Nasher. I've spent way too long on this problem over the Easter weekend and am well hacked off as there where other things I was meant to be doing with the family.

Oh, and another thing!.......Why does it always start to rain when you walk outside to start some work on the motor?
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Old 25 March 2008, 18:00   #17
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Swapped over the 2 weeks old distributer cap and rotor arm for replacement ones and all seems OK. I'll get the Missus to drive it around locally this week and the weekend just to make sure.

Thanks for all your help.

Andy
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Old 25 March 2008, 18:21   #18
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Splendid, new equipment is just as likely to break down as old, too many times ive found that out,
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Old 25 March 2008, 19:09   #19
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Splendid, new equipment is just as likely to break down as old, too many times ive found that out,
Oh yes - especially on computers!!!
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Old 25 March 2008, 20:51   #20
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Oh yes - especially on computers!!!
Or NGK spark plugs....
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