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Hello, I hope some old timer or young protégé might know why my car at around 40mph starts miss firing. It is a Bosch Z43 points distributor with advance and retard vacuum pipes. Only happens when driving,static on my drive, I can rev the car right through its rev range in neutral. I do not seem able to cross reference it, to convert to electronic ignition. It is left hand single points. The codes are VW Audi 052 905 205 Q and Bosch 0 231 194 003. I have tested the vacuum and advance with a vacuum pump, and all is advancing and retarding satisfactorily.Any ideas most welcome?
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Might be worth asking in the technical section (in the ‘build’ section) if you don’t get much response, but is it definitely a misfire?
I'm in no way an expert, and hopefully someone qualified can offer assistance, but I’ve had stuff miss and run rough because of blocked jets or fuel starvation at higher revs, which feels a bit like a misfire too. It sounds a little odd if it’s starting at that speed, I’d expect a misfire to be worse under load so more when accelerating hard.
Not much help, sorry, hope you get it sorted
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jpr1977
Club Retro Rides Member
Posts: 656
Club RR Member Number: 18
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What state are the plugs and particularly leads in? They can be a bit precious when the leads are 'tired'...
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As above, as you put more load on the engine the charge gets denser and needs more energy for the spark to jump across the plug, if it can find somewhere of lower resistance it will, plugs, leads rotor arm and cap would be my starting point.
Last winter I sorted out our neighbours elderly polo, it was running really rough and finally wouldn't start, all the plug leads were rigid and brittle, The old boy was ready to scrap it, £40 of service parts (the air cleaner looked like it had been down a coal mine too) transformed it.
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I owned one of that vintage back in the day (I do not however consider myself to be an old timer, they pan for gold my book).
Check those points, they have a habit of slipping unless the spring washer under the main screw is in very good condition. Failing that, all the usual issues as described by others.
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Hello an old timer here! I would be checking the condition of the points first if this has not been done already or just replace them and the condensor. Set the points gap to 0.40mm and check and adjust ignition timing.
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rodharris83
Club Retro Rides Member
Day Dreamer...
Posts: 760
Club RR Member Number: 4
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After owning a Mk2 Golf 1.3 I wouldn't rule out an issue with the Carburettor. The Pierberg 2eX carbs are notoriously bad... linkI'm'm not saying it's definately the issue, but from experience I know they cam cause bad running issues. |
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Oct 12, 2021 14:12:58 GMT
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i had one of these. there's a rubber gasket under the carb that fails and randomly gives you vac leaks and lean running, also as described above the jets block up often, but can be easily removed and cleaned.
So set the points gap, then set timing with a old skool timing light, make sure it has a decent fuel filter that's not blocked. Change the plugs and pull the vacuum advance line off [pull the carb end off] and give it a suck and listen for engine note changes, if the note doesn't change then the diaphragm in the dizzy is probably rotten or the mech is seized.
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Last Edit: Oct 12, 2021 14:20:23 GMT by legend
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