I have a rattle snake in my engine

[A.E]

So this noise is still there, wouldn't say it's gotten worse.

It's a top end rotational noise, sounds abit like timing chain slap lol, but most probably a lifter, question - these engines have hydrolic lifters??

[Sleepy Gonzalez]

No. They use shims in the lifter buckets to adjust the lash. Last checked mine at 200k and the worst were just at maximum clearance limit. No excessive noise.

You could pull the cylinder head cover and check for damage to the camshaft lobes, if something fell in the oil filler or damaged timing belt etc.

My ac compresser developed a tapping noise, with no effect on performance for a couple of years.

Noisy injector?

Have you tried locating the sound using a screwdriver or similar as a stethoscope? You can locate noisy injectors and valves etc that way.

[Clean_Cookie]

i.e put the screwdriver pointy end onto the engine block, and the handle onto your ear. we use it for looking for bad bearings on electric motors. never used it on a car though!!

[Sleepy Gonzalez]

I've only really done it out of curiosity, but you can hear all sorts of different stuff at different points on the engine. A few days ago I used this method to check injector vs lifter noise on the KLZE, which is supposedly bad for HLA tapping. Mine seems fine (although it was noisy the first few starts after being idle for many months), the injectors make more noise. esp the back right for some reason.

Obviously can't do this under load unless you're on a dyno (or crazy!)

Another thing I tried was attaching a $10 micropone to the engine and recording the sounds on my laptop while adjusting the ignition timing with the emanage. It really works! You can hear the sound changing slightly as timing is advanced closer to detonation. Can also hear the gearbox doing it's thing too.

I just reread the original post, which says 4,000rpm under load. If you want to know what pinging sounds like, drive an M101 Daihatsu Sirion on 91RON. I thought it was just my wife's car, but I heard another one driving next to me recently doing the same thing- light mettalic rattling noise proportional to engine speed. Stupid thing needs 98RON to avoid pinging even while cruising. Haven't figured out why yet.

You could try using 98 and see if it makes any difference to your car.

[Clean_Cookie]

Originally Posted by Sleepy Gonzalez

I've only really done it out of curiosity, but you can hear all sorts of different stuff at different points on the engine. A few days ago I used this method to check injector vs lifter noise on the KLZE, which is supposedly bad for HLA tapping. Mine seems fine (although it was noisy the first few starts after being idle for many months), the injectors make more noise. esp the back right for some reason.

Obviously can't do this under load unless you're on a dyno (or crazy!)

Another thing I tried was attaching a $10 micropone to the engine and recording the sounds on my laptop while adjusting the ignition timing with the emanage. It really works! You can hear the sound changing slightly as timing is advanced closer to detonation. Can also hear the gearbox doing it's thing too.

I just reread the original post, which says 4,000rpm under load. If you want to know what pinging sounds like, drive an M101 Daihatsu Sirion on 91RON. I thought it was just my wife's car, but I heard another one driving next to me recently doing the same thing- light mettalic rattling noise proportional to engine speed. Stupid thing needs 98RON to avoid pinging even while cruising. Haven't figured out why yet.

You could try using 98 and see if it makes any difference to your car.

he filled with bp ultimate aparently?

[A.E]

Yeah I use BP98 religiously. I won't use anything else.

I'll pull out the chassis ears if I have to, workshop tool we have.