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 Miss fire 
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1099
Location: Exeter, Devon
Post Miss fire
The Shed's engine miss fires if I just open the throttle a little. It idles nicely, and runs ok once you get past the rough spot. Can't say I've noticed it when driving as I would normally give it more beans.

It has luminition ignition. A Harley type (black) coil.

Any thoughts!

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


November 20th, 2019, 10:56 am
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
Posts: 720
Location: Reading, Berks UK
Post Re: Miss fire
Full throttle everywhere? You probably do that anyway though.


November 27th, 2019, 12:59 pm
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Firing on two.
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Joined: January 1st, 2009, 7:37 pm
Posts: 4523
Location: No Longer In The Shetland Islands
Post Re: Miss fire
Well, my 123ignition gave up the ghost two weeks ago, after 16+years and close to 200k miles. I've bought a new one from ECAS and there's an additional piece of paper that states that the standard 123 will fail if a 'super coil' is used, so maybe it's a thing with Luminition too. I don't have a 'super coil' fitted.

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November 27th, 2019, 3:41 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1099
Location: Exeter, Devon
Post Re: Miss fire
I would be surprised if it was the lummy itself. Could be a connector of course. Or plugs even. Coil, HT leads. Then there fuel and air leaks. Tappets are sounding tappity. :D

I'll start looking properly. :)

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


November 27th, 2019, 6:22 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Miss fire
Roger,
not sure if I've already asked this, but has the carburettor been rejetted yet?

Any hesitation/ 'almost' misfiring due to a weak mixture on the primary choke will be much more pronounced in cold weather.

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November 27th, 2019, 7:52 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1099
Location: Exeter, Devon
Post Re: Miss fire
Hi Ken

Yes you did back in late February. It has a dyane cowl and pipework. You suggested 110 primary jet.

Not convinced its fuel, but you never know. :)

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


November 28th, 2019, 12:04 am
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
Posts: 1406
Location: South-Limburg
Post Re: Miss fire
is the little injection pump on the carb working?


November 28th, 2019, 9:24 am
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1099
Location: Exeter, Devon
Post Re: Miss fire
That appears to work ok under normal driving conditions. This only happens if I open the throttle a little bit.

I only noticed it because i was trying a new ignition system and it was running badly. I swapped it back to compare and there it was.

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


November 28th, 2019, 10:14 am
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1099
Location: Exeter, Devon
Post Re: Miss fire
I think I may have resolved this, this morning, but we wIll see. :)

For the new ignition system I am currently fighting with, I have coil on plugs (VAG bosch 036 905 715).I used the same ground point on the bulkhead, as the regulator ground. When on the old system (lumenition), I noticed the max voltage had risen slightly when reving the engine. I decided to move the cop ground to the gearbox, and make good the regulator ground.

Result

The mis fire has gone, and I have a rock solid idle!

Still the new system to sort though. I've ordered some resistor type spark plugs. :D

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


December 8th, 2019, 1:29 pm
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Firing on two.
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Joined: March 5th, 2009, 6:23 pm
Posts: 1929
Location: Near Monmouth
Post Re: Miss fire
Hi Roger,
Which ignition system.?
Need a cop driver design/circuit??
Have 2 cop units with connector plugs only 2 wire.
About < 1 ohm each, loath to try them in the 123 ignition as they state min off 1.5 ohms
Any hints

Cheers
Peter


December 8th, 2019, 3:03 pm
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