Whats Wrong With My Engine ? Top End Rattle

[Guilt-Toy]

Was driving the rb25/30 today and it started to make this sound that sounded like a tingy sound in the exhaust

Then the car started missing for a bit then it came good again.. Then it started missing and i got home.

When i switched it off for 2 minutes and turned it back on again the miss went away and it idled happily for 2 minutes without any issues. So i sat the revs on 2500rpm and it started making this really loud noise right at the top of the engine near number 5 then started missing again.

There is no smoke commin from the oil cap when missing or not... It sounds like a really high pitched tap / clacking sound.

Anyone got any ideas what it could be ???

Im starting to think its the intake lifter on cyl 5

Every time i switch the car off and turn it back on again the miss goes away untill its reved.. if you let it miss for about 20 seconds or so sometimes the miss goes away again.

Could it be coil packs or a plug or something ? how would that explain the clucking sound?

Any ideas would be appreciated

[Cubes]

Grab a decent sized screw driver and shove it hard up against your ear while you listen around, injectors various parts of the head etc.

It may be worth while ripping the coil cover off so you can get in there and have a good listen exactly where the noise is coming from.

Good luck.

I had a strange rattle noise coming from the front of my motor recently, had a listen around, tightened up the fan belt and discovered my alt bearings are on their way out

It was a relief to know it was only the alt.