Deep ticking coming from valve cover

[lazyfcker]

(91 240sx ka24de automatic ) before my car ticked from around the valve cover figured it was the injectors...Now i still hear this noise and when i rev a little and release the throttle cable it makes a deeper tick like something is clunking in or around the valve cover, or when im about 45mph and just hold that speed you can again hear this clunk noise coming from the engine i always heard it but it was quicker and quieter (people told me it was something like the pully or some crap like that) but it would stop if put in overdrive to lower the rpms (so in conclusion sounds like when im in mid rpms or releasing throttle it wants to make this noise) i dont have any idea what it could be, so i came to you mechanics hopefully yall can help. Go ahead and hit me with the bad news.... i also think it might be timing or something stuck in the cams. please help.

[NISTECH]

by description it leans toward rod knock, but it would be more of a low frequency ratle on light throttle or on decel from low rpm. try bringing the car to a steady throttle around 1000 to 1100 rpm and listen for the noise, this is done while not driveing. If you get a steady low frequency rattle noise it could be crank or rod bearings, you need to be able to determine for sure though if its coming from top end or bottom end. If you determine its bottom end thats likely what it is. you can isolate which [crank or rod bearing] by pinching of the PCV fresh air inlet off the valve cover. If after a few seconds of pinching off the hose the noise goes away its a rod bearing.

[lazyfcker]

by pinching the pcv valve connecting to the valve cover, do you mean more less taking it off or what? thanks

[NISTECH]

no I mean take a pair of pinch off pliers or needle nose pliers and pinch the line so no air can go through it.

[lazyfcker]

ok i just did what you told me to do and when i put it at 1000-1100 rpms it didnt make the noise, but i had someone sit in the car and tell me the rpm's where between 3000-3500? has me lost. And i cant really tell the exact location of the noise but sounds around the back of the head (piston 4) thanks for any replies.

[NISTECH]

1000-1100 rpm would be just barely off idle.

[lazyfcker]

i know i just had to barely tap it to get to that rpm being my car idles at 800. And when at idle or 1000-1100 rpm it doesnt make that noise. any ideas?

[lazyfcker]

bump?

[NISTECH]

I am still thinking its a rod or something like that by reading your initial post. Its really hard to be sure though without hearing it first hand.

[lazyfcker]

yea its really starting to confuse me, because someone else was telling me i'd notice a pretty good change in power but it seems the same, i might take it to a shop to look at sometime this week. i'll keep yall updated.