1972 E9 3.0 CSI - Chamonix

RTHLSS1 said:
Having problems with sparks. Used Denso iridium for a few years now. Replaced them with new ones this season but spark is bad and the engine stalls - especially when sitting for a while.

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Conventional wisdom agrees with HB Chris✓. Most recommend using standard copper core spark plugs as these were originally equipment from the factory.

That said, if you experienced no problems with Denso Iridium plugs, it is unlikely that switching to a different spark plug brand with a comparable heat range and design would make a noticeable difference in engine operation. Without additional information, perhaps your replacement spark plugs have an extremely wide gap that tests the limits of your presumably "stock" ignition system?
 
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Service was done, changed oil to liqui molly classic.

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MOT was done. Went together with my e24 and e46 m3.

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Only did 830 km last season.

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