Hi, does anyone know where I can get ignition coils for a 650cc Copen, ECU keeps showing misfires, although nothing seems noticeable when driving etc, have changed spark plugs and used injector cleaner, but the fault keeps appearing every 200 miles or so. HELP ☹️
Try a Daihatsu dealer in your vicinity, apart from a breakers yard they might be the only people that can help you. I cannot find the coil packs anywhere except for japan. Are you 100% sure its the coil packs? Maybe the wiring harness has a bad contact www.daihatsu.co.uk
Thanks, not 100% about coil packs, seems to go a few weeks ok then throws the misfire code cylinder not specified, running and idle seems smooth, I would not know where to start looking for loose connection, however I did try cleaning the plugs and sockets on top of the coils.
If this occurred more often you could try to pinpoint one of the coilpacks so you would only have to replace one instead of four. But I'd say: As long as the coil packs are not identified as the faulty parts, I would not buy them
The misfire could also be down to fuel air mixture, vacuum leaks etc. Our yellow "Waspy" gets these errors normally going up a hill as the load comes on and you put your foot down a bit harder. I have checked the vacuum pipes but cant find or hear any splits etc. and the filter is clean. I may look at drilling the rear of the filter housing (like of have seen on here somewhere) to see if that helps air flow. We changed all plugs to iridium and all electrics seem tight fitting. Not sure if the O2 sensor is ok at the top of the engine as it has been replaced by someone as it is a generic lead coupled to the original connector block.
I had the misfire problem, Daihatsu Garage could not diagnose it, it was the Coilpacks, replaced the coilpacks with second-hand ones, and misfire/judder went away - look on Ebay.
I had this problem and my local Daihatsu garage could not solve it either. Eventually the problem was solved by a new set of plugs and a new battery!
Has anyone tried using a different coil pack? You would think any coil pack that had the same internal resistance could be used with maybe a modified plug and a change of mounting system. I find it hard to believe that Daihatsu would have made a completely unique coil pack just for this motor. More likely modified an existing one to suit the mounting location they wanted.
I had installed new plugs and the original problem persisted, replaced the coilpacks with a secondhand set, and instantly cured the problem.
It had new plugs at it's last service, but the issue is still there, it's going into the Daihatsu dealer in a couple of weeks to have the breathing pipes and spring connections on the coil packs checked. Mechanics don't seem to think it's anything major as it only happens occasionally and usually at idle speed,which sometimes seems to go a bit low.
Hi Vince - sounds like the coilpacks, starts slowly, builds up, hard to replicate, but you know it is there, I doubt anything will show up on the Daihatsu Dealer diagnostics. I've been there. It happened to me, it was nothing to do with the connections, it was the coil packs themselves. Fitted some second-hand ones from a breakers yard and hey presto, problem fixed.
