Ian Kinder (Bagpuss) - Joint Peak District AO Posted October 14, 2018 Posted October 14, 2018 Hi @Terryathome what makes you think your misfire is caused by the coil packs? I'd check the condition of the HT earth- should be on a crimp on the back of the cylinder head like this: The HT earth is the single black wire in the blue crimp. Also check the condition of your earth connections near the washer bottle. You could always run a temporary cable from the battery -ve to this stud on the back of the head to rule earths out. Also, check the security of the wires into all the coil pack and fuel injector connectors. Omex don't replace these when they make your loom and some have found breaks on these. I've secured all mine with cable ties to reduce the strain on the joint. Do you avoid repeated starts when the engine is cold? The S2000 is prone to fowling the plugs? I also had a loose crimp in my ECU connector (loom side) which was one of the two ignition coil feeds going to the coil pack. Waggling the wires on pin 1A or 12A may reproduce the cut out your getting.
Dave Eastwood (Gadgetman) - Club Chairman Posted October 14, 2018 Posted October 14, 2018 Yeah, my near roasted cat was caused by a poor crimp on 12a.
Terryathome Posted October 14, 2018 Author Posted October 14, 2018 From all the googling I've done it seems that the coils packs seem to be the problem. The only problem I have is that I haven't looked at all the things you have mentioned that could be giving me the intermitant misfire. Intermitant did I hear, yes it would be in my first mind to check the connections and have already in my mind to check a whole lot of stuff. You have just added a whole lot more, cheers for that. It's garage Sunday so will be in there giving it some. By the way have sourced some coils and will have them middle of this week. Even if they don't form the solution having spares can't be a bad thing can it. Been accused of hoarding in the garage but if I keep going will be able to build another car. Oh hang on, I am lol. 2
Dave Eastwood (Gadgetman) - Club Chairman Posted October 14, 2018 Posted October 14, 2018 Definitely no harm in spares! i hate to throw this one at you too, but I also had an intermittent miss-fire, (after the cat over heating incident). Happened mainly at high revs at first, would just occasionally miss a couple of times, typically while overtaking, above 5 or 6k rpm. Then, on a run out after a Curborough meet, it started getting worse, instead of just missing a couple of times, it old miss for longer and longer bursts, acting like a hard cut rev limiter almost, and the rpm it happened at started creeping down. Pulled over to the start of the road, tried to restart and it wouldn’t. Turned out that it was the cam sensor - another of the re-crimped, re-used connectors. One of the wires at the cam sensor end had actually gradually worked loose, and when I’d stopped, had finally pulled completely free. The F20C won’t run at all without a cam sensor on the Omex system.
Terryathome Posted October 14, 2018 Author Posted October 14, 2018 Car was tuned without cat but had to put it back on for mot needless to say it's going to be the first job to take it off. Now that you mention your symptoms they are very similar to mine. Still got the coils just in case. Breakfast first, full Monty to give me strenght to wrestle the cat off. 1
Ian Kinder (Bagpuss) - Joint Peak District AO Posted October 20, 2018 Posted October 20, 2018 Any luck finding or fixing this annoying fault yet @Terryathome?
Terryathome Posted October 21, 2018 Author Posted October 21, 2018 Yup it's fixed, well I think it is. Went for a blast, not a hint of misfire at all. Had the spare coils in the boot just in case but didn't need them. Checked wires, connections, coils, spark plugs even the filters on the injectors. Not checked fuel pump connections or water in the tank yet, just a thought. Will bite me in the A*** when I least expect it to.
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