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VX calias L77 engine metallic noise

Jamc

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Hey guys, I seen some old posts on this, but still doesn't answer my question.
So I've had this engine knock or pinging, metallic noise, it only seems to do it at around 1800 to 2000 rpm
Only seems to do it when it is at operating temperature, I've had it at my mechanics several times now on the computer, even when he tries to pull timing out nothing seems to change, but the weird thing is, some days it's not there, my mechanic found a broken insulator on one of the spark plug leads, thought he had fixed it, noise wasn't there for a 2 weeks, then it came back, I'm so lost as to what to do, it's driving me nuts.
Could it be in the tune itself, my mechanic suggested to me to uploading another completely fresh tune into it, could it be the tune thats corrupted, has anyone else experienced this bizarre problem.
 

mpower

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get a second opinion. (that's not the internet).
 

Asmodai78

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does it sound like a metallic chirping sound, being an L77 it could be your lifters starting to fail
 

Jamc

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does it sound like a metallic chirping sound, being an L77 it could be your lifters starting to fail
Wouldn't say a chirping metallic sound, don't know hard to explain the sound
 

Jamc

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Maybe one of the other spark plug insulators has had it ? Has someone checked that out?
All spark plug leads were changed brand new, at the time of finding the other dodgy one
 

Jamc

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I also forgot to mention the noise goes away when I added Octane booster with BP98, and always run it on BP98
 

gtrboyy

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What is mileage on it? Tuned or all stock?

Some ls will make hell of a lifter racket or engine noise that it can set off knock sensor.

Hop on youtube look at ls lifter tick/ls dod lifters or exhaust leak clips.
 

Jamc

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What is mileage on it? Tuned or all stock?

Some ls will make hell of a lifter racket or engine noise that it can set off knock sensor.

Hop on youtube look at ls lifter tick/ls dod lifters or exhaust leak clips.
180000 kms and it is tuned, mild cam, extractors, otr, high flow cats, ok I will have a look
 
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