Spark Plug Problems. 2.2 JTS - Alfa Romeo Forum
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Spark Plug Problems. 2.2 JTS

Hi all,
I've recently replaced the spark plugs on my 2.2 159. The removed plugs all have an even black sooty coating which runs up the thread. Any thoughts?

My worry is that they are showing a problem with my engine causing it to run 6bhp below the manufacturers 185bhp on a dyno run. The car has 107k miles.

Spark plug model fitted was NGK FR5CP.

I have replaced with the BKR5EIX upgrade recommended by NGK.

I have also removed the old air filter and replaced with PiperCross. Run injector cleaner through the engine and started using a higher RON fuel.

Your thoughts and recommendations guys and gals.
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I wouldn't use the Iridium plugs, mine started to misfire after 6000 KM and Engine MIL flashed.

Solved with new Platinum plugs.
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Brera 2.2

I know this isn't very constructive but after 107k I'd be more than happy with only a 6hp loss
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jts , plug , problems , spark

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