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Showing results for tags '3.1l'.
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As the title suggests, the 3.1l LH0 v6 "vin T" in my car makes a noise that sounds like a knock (tap tap tap tap tap) on a cold startup. It sounds like it's coming from the middle of the engine. If I rev it past 2k rpm or so, the noise is no longer audible. I've also noticed that if I get rambunctious with it and floor it when cold (as much as I hate doing that), the noise disappears quickly, suggesting to me that maybe it's a lifter that is not properly pumping up. It's also worth mentioning that the engine is super quiet after warming up besides a little rocker arm noise. The rapping "tap tap tap" goes away after the temp gauge raises up above it's lowest reading.