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| Irregular spark https://ausmini.com/forums/viewtopic.php?f=2&t=95935 |
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| Author: | zulu_warrior1976 [ Tue Aug 22, 2017 9:05 pm ] |
| Post subject: | Irregular spark |
Hi All, My 1275 is miss firing badly and I'm having difficulty determining the problem. Fuel is 98 and is fresh Carbies are set up correctly New plugs New leads New points Dizzy has been checked and looks fine Coil has been replaced No evidence in dizzy cap of tracing The only thing left to replace is the rotor.... Is there anything else I might have missed??? 
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| Author: | A-7 850 [ Tue Aug 22, 2017 9:59 pm ] |
| Post subject: | Re: Irregular spark |
maybe vacuum leak in brake booster or faulty pcv valve ? |
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| Author: | zulu_warrior1976 [ Tue Aug 22, 2017 10:24 pm ] |
| Post subject: | Re: Irregular spark |
It seemed to develop slowly over the course of 2 weeks with a minor miss every now and then. Then one day just started runnin like a wooly goat. |
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| Author: | 9YaTaH [ Wed Aug 23, 2017 11:25 am ] |
| Post subject: | Re: Irregular spark |
zulu_warrior1976 wrote: It seemed to develop slowly over the course of 2 weeks with a minor miss every now and then. Then one day just started runnin like a wooly goat. There's the problem...it should run like a Morris Bull  Take off the vac pipe to the booster and see if there is fluid sitting there...when boosters fail it is usually shown as white smoke out the back... |
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| Author: | sitnlo62 [ Wed Aug 23, 2017 11:46 am ] |
| Post subject: | Re: Irregular spark |
Do a compression test, Might be a valve! |
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| Author: | timmy201 [ Wed Aug 23, 2017 11:47 am ] |
| Post subject: | Re: Irregular spark |
If you have any loose connections to the coil it'll give you irregular sparking. I have had dodgy spade connectors, and dodgy wire crimping which caused me issues Have you got the dwell set correctly? |
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| Author: | zulu_warrior1976 [ Wed Aug 23, 2017 12:00 pm ] |
| Post subject: | Re: Irregular spark |
Hi all, should be able to provide an update tonight and will investigate the excellent suggestions that have been made. Thank you all so much. Z |
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| Author: | ausdino [ Wed Aug 23, 2017 1:23 pm ] |
| Post subject: | Re: Irregular spark |
Cracked distributor cap ? I've been caught with this one before. |
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| Author: | zulu_warrior1976 [ Wed Aug 23, 2017 1:29 pm ] |
| Post subject: | Re: Irregular spark |
ausdino wrote: Cracked distributor cap ? I've been caught with this one before. It looks ok. Will have to double check that. Sent from my iPhone using Tapatalk |
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| Author: | zulu_warrior1976 [ Wed Aug 23, 2017 2:17 pm ] |
| Post subject: | Re: Irregular spark |
Hi All, Just spoke to the mechanic.... He's checked everything and changed everything that has been mentioned in this post so far. Still backfires like a mofo. I ran through everything that the kind mini forumites have suggested and they've all been checked. Both he and I are at our wits end.... Is there anything else it could be? |
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| Author: | timmy201 [ Wed Aug 23, 2017 2:20 pm ] |
| Post subject: | Re: Irregular spark |
Blocked fuel filter? Empty float bowl? Do you have a tacho? Is the needle affected by the misfire? |
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| Author: | zulu_warrior1976 [ Wed Aug 23, 2017 2:25 pm ] |
| Post subject: | Re: Irregular spark |
timmy201 wrote: Blocked fuel filter? Empty float bowl? Do you have a tacho? Is the needle affected by the misfire? No tachometer. Bowl levels look fine. Blocked fuel filter... will check that. Thanks Timmy Sent from my iPhone using Tapatalk |
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| Author: | timmy201 [ Wed Aug 23, 2017 2:33 pm ] |
| Post subject: | Re: Irregular spark |
It might be worth checking the tappet clearances, and compression just to be sure. A cheap tacho only needs 3 wires - ground, neg coil, pos coil so it's very easy to wire in temporarily. Otherwise a good timing light with a tacho will tell you if it's jumping around. If the dwell is too short the coil won't be charging up fully. |
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| Author: | zulu_warrior1976 [ Wed Aug 23, 2017 3:08 pm ] |
| Post subject: | Re: Irregular spark |
timmy201 wrote: It might be worth checking the tappet clearances, and compression just to be sure. A cheap tacho only needs 3 wires - ground, neg coil, pos coil so it's very easy to wire in temporarily. Otherwise a good timing light with a tacho will tell you if it's jumping around. If the dwell is too short the coil won't be charging up fully. Compression is 180 consistent across all 4. Will check the other suggestions Thanks Timmy Sent from my iPhone using Tapatalk |
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| Author: | whiteysi8876 [ Wed Aug 23, 2017 3:56 pm ] |
| Post subject: | Re: Irregular spark |
replace the condenser in the distributor |
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