Kippei 3rd Gear June 29, 2015 Share June 29, 2015 During the last servicing, I request for a full servicing since immediately i got my 2nd hand car. I requested for a Denso iridium but it turn out to have a NGK copper plug installed inside. Fine... little did i realise the spec for the plug is a bit off in the spark position parameters. Its +1mm more. I always wondered why my car got this weird pulsing engine vibrating where it thud harder than usual. After changing to the correct spec denso spark plug, I can feel a bit of HP increase and also the weird pulsing vibrating is gone. Morale of the story, always check what your workshop have done to your car. ↡ Advertisement Link to post Share on other sites More sharing options...
Yeobh 4th Gear July 31, 2015 Share July 31, 2015 Servicing Spark Plugs - You're Doing It Wrong! (The Trainer - August 2015) ↡ Advertisement Link to post Share on other sites More sharing options...
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