I'm not deliberately abusing the Technical Help section with my old banger* :-) i have tried to make sure i've chipped in to help others where i can too. If i have any more problems after this i'll pollute one of the other forums with my woes :-)
Ok so i'm ready to book my MOT but i can hear a slight misfire at idle.
The car's had various vac leaks and poor idle since i got it (common mk4 petrol fault). The vac leaks are all cured (i think) - i can spray carb cleaner all over the intake components and no change in idle speed now. Just remembered i haven't checked the servo vac pipe.
Which leads me to spark. It's not a horrible misfire so weak spark? It seems to get better with a little throttle.
I've put new plugs in. I've tested the coil pack secondary windings resistances, all the same cyls 1 & 4, and 2 & 3. Can't test primary windings without removing the coil pack (access issue).
Bought new HT leads today but they're the wrong ones so will get them exchanged in the morning. Have run it tonight with the bonnet up, no visible sparks from the existing leads.
I've had to reset the fault codes (too much noise from all the battery disconnections) so it might trip a lamba fault tomorrow. Was thinking reading live values meantime for lambda - spark problem will be low lamba, air problem will be high, i think.
I think i've answered my own question now :-) ah well i've written it all now... Post!
* it hurts to call it what it is, a banger. I've put so much time and effort into it!
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Volkswagen Golf IV - 98 1.6 Misfire new