hey my RB20DET has been making a tapping noise recently heres some facts
-always there hot or cold
-quicker with reving
-is silent when off the accelerator
-sometimes i get an ECU error on my consult screen (34) knock sensor usually only for the first 5 mins on very cold mornings but sometimes during normal conditions....
-i wired the fuel pump straight to the battery so its on full blast all the time, there was not much noise before this if any...
-revs are a bit strange sometimes at idle it will just go up and down between 1k-2k rpm sometimes will go down to 400rpm when stoping
-if i give it some just after it starts i will get a screeching noise for a few seconds sounds like fan belt but its a little different
-its not that loud if you rev at idle, heaps louder under load
-misses randomly sometimes
-i can't be sure but sometimes it feels like the engine is being held back, like the handbrake is being pulled... not sure about this though
basically trouble started after fuel pump relay died and i wired it straight to the battery this may not having anything to do with it, cause i was also doing some very hard thrashing at the time....
i have listened to it at idle with a screwdriver but i can only hear the fuel rail and injectors ticking which is normal i guess.
i was thinking that the increase in fuel pressure could be making them noisy but not sure...
could be lifters i guess but the sound should be there on and off the throttle which it is not?
any ideas?