Quote:
Originally Posted by Clifford Pope
Thanks. I have found a few reports on other internet forums, mainly in US, of suppressor capacitors causing misfiring.
My car is the LH 2.4 system - no contact breaker, no ballast resistor, but presumably the effect would be the same?
It seems odd that the effects have been so specific - cold start, misfires 10 seconds into a journey, corrects itself after a further 10 seconds, then runs perfectly. If I idle the engine for the 10 seconds first, or take my time going down the drive or stop to shut the gate, it doesn't do it.
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I would assume it would have a similar effect, might be worth cleaning the main LT connections and tightening the spade connectors to be on the safe side.
Given those symptoms, i'd suggest (as above) cleaning the connections as it would appear there is resistance somewhere but also that the capacitor is probably breaking down internally - not completely as yet, just a minor short circuit that gets "cleared" by use, maybe a bit of water ingress into the capacitor that gets burned off. Cold engines need a better spark to fire the mixture consistently so that part fits as well, it could even be the capacitor is continually breaking down but on the warmer engine, it isn't noticeable.
Have to say it's the first time i've come across this, however given that the newest suppression capacitors (assuming OE fitment) will now be approaching 22 years old, highly possible this is beginning to happen.
The change to distributorless ignition around 2000 or so more or less made them redundant as the loom could be designed to reduce interference, also audio units were better insulated from interference and so on so i'd say the answer now would be if you don't experience interference on the stereo then lose the suppression cap and if you do, buy a new replacement. Looking back, they would probably have been OE fit on many cars from ~1980-2000 so this problem is likely to become more obvious with a simple solution.
