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nah - I'm pretty sure these Volvo injectors tick. When I switch over to LPG, it stops ticking. Dunno if Volvo ones are a bit louder than general. I thought stethescopes were used to make sure a particular one is actually ticking coz you cant just isolate one with the naked ear above the noise of the engine and the other injectors ticking. Maybe they are so loud on the Volvo because they are right in front of you or positioned so the engine refects the sound somehow making them seen louder. Dont yours tick also?
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