Reply With QuoteHi Keithy,
I have had a lot of experience dealing with misfiring over the years with my 3.5L County on LPG, but that is running carbies and a distributor, so i don't know how much help i can give you with your set up. I will say this though:
- the NGK BPR6ES plugs are the most reliable plug i have used over the years. I did have a regular misfire issue and during that time i swapped from NGK plugs to Bosch plugs (WR7DC+) to try to solve the issue. In the meantime I found that the root cause of the misfiring was a sloppy distributor, which i replaced. Anyway, the Bosch plugs seemed fine for a few years, but then I started having issues with misfiring again after only a few thousand km's of each new plug set. Turns out they are made in Russia now. I have since gone back to using the old NKG plugs (which I had kept) and I have had no more spark plug related misfiring despite them being second hand! I get about 30,000 km out of a set. I gap them at 27 thou (just under 0.7mm). The gap doesn't widen anywhere near as much as yours do though! (Not sure what is going on there...)
- I use the black Bosch inductive core leads from the shelf at supercheap auto. They seem to work well - In the last 8 years i have only ever had 1 dud lead. I replace them at 100,000 km for peace of mind, but I keep them as spares because i reckon they would still be fine. The only issue with them is you need to make sure that they are kept as sperate as possible as where they cross over can cause misfire. I was told years ago by a Rover mechanic and an ignition expert that you need to keep the ignition leads off anything metal or anything black in an engine bay as carbon would commonly be used to colour these black components. Anywhere my leads cross over I either use a lead separator clip thingy or just wrap the lead with some old ignition lead boots.
Anyway, i hope my ramblings have confirmed some of your thoughts with your electrical componnets. All the best with it!
Edward
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