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Message: <blockquote data-quote="8080pbmw" data-source="post: 216395" data-attributes="member: 949">Was at the workshop yesterday, there was a E34M20B25 being serviced.got the tick tick tick noise coming from the engine. So I ask the mechanic servicing the car about it. My guess was the hydraulic tappet/lifters, but my suprise, the tick tick tick noise is actually the fuel injectors. Worn Hydraulic lifters/tapper will sound like tak tak tak as mentioned by dannychew. tick tick tick is the fuel injectors.the solution is to have them replaced but they are costly. so it depends on the owner on how irritating the noise is to him. That owner of the E34 is going to live with that tick tick tick noise.just my 2 sens. hope you find the most cost effective solution. Cheers.</blockquote>