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The mkiv Supra Owners Club

Spark plug Problem


JamesRZ

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I have been having problems with my spark plugs for a while now i am running 1.2 bar with bpu. When i first went BPU i used IK22 plugs but after a week developed a misfire took them out and they were scorched on the porcelain and i could feel a lot of movement in the whole plug. I replaced them with IK24's and were fine for about 3 weeks or 600 miles when i got a slight misfire on tick over and load. Then to make matters worse the 2nd turbo blew which i replaced with standard j-specs. Got it back on the road last monday and the misfire got much worse and the exhaust popped when i had my foot down. Last night noticed that there was a high pitched noise coming from the engine so took the plugs out and the 24's have gone even worse than the 22's did. I have done a search and found that 24's are best for bpu but dont want to waste another 40 quid!

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