Loud Rapid Tapping noise on WOT or neutral rev around 5,000 rpms !!!!!!!! HELP
Ever since I bought my car (about 2 weeks ago) when I would go on WOT or close to it, around 2500, and again around 4,000-5,000 right before my auto would shift I could hear a loud fast paced tapping noise coming from the back of the engine near firewall(or so i think). When i would rev it in neutral i could hear it and it would be worse.
So i figured Id do a crank case flush, and then put some expensive High millage oil in it and some oill additive to help lifters,valves etc..)...Right after i turned the car on after this oil change I could hear that same tapping noise during idal for about 10 seconds and then it went away. Now after driving it w/ the new oil change It only makes the rapid tapping noise around 5,000 rpm before shifting on WOT. undernormal driving conditions you wont hear this unless accelerating very fast. Although even after the oil change when i put my car in park/neutral and rev it the tapping noise can be heard around the 2,500 - 3,8000 range. Quite odd. I have addes some fuel system cleaner to my fuel to cleanup and injectors, valves, etc.. I am quite concerened Do you guys have any ideas?
centripical force. The faster something spins if out of balance the more predominant it becomes at higher speeds/rpms. Same theory if your working on a lathe and it isnt perfectly aligned. once one end becomes out of sync it only gets worse the faster and more you use it.
I was thinking it was a lifter, but when reving in park, the sound doesnt seem to be coming from the valve covers more from rear of engine or that general erea. Anyways my car has almost 80,000 miles.
I was thinking it was a lifter, but when reving in park, the sound doesnt seem to be coming from the valve covers more from rear of engine or that general erea. Anyways my car has almost 80,000 miles.
Well actually Im not positive actually now I belive it is a valve train related, as the tapping isnt as rapid as the engine RPM (which would mean engine rotary related) it is more of a every 6 kind of tap thus leading me to think its a valve train related. Im most likely going to have to take it to a shop to have the valve seals looked at (whcih i think is causing the tapping, since at one point the head gasket was replaced which may have caused damage).
How much do you think it will cost to have a valve replaced by a pro? Is it possible for me to do it on my own with normal tools?
I'm thinkin' exhaust leak, which is more common .. .
If you've got to replace a valve or valve spring, you may as well get the heads done and replace the camshaft. It won't cost that much more . ..
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Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
what do you mean by get the heads done and camshaft? Have what done on them?
Replacing 1 vavle is not a good idea, you should replace them all, as the labor required is not much more. If you have to replace another valve in the near future, it'll will cost you the same amount, and they tend to have failures at the same time.
secondly, while the engine is wide open, you may as well replace the entire valvetrain, as the vave failure may be related to the springs or lifters.
Once the engine is torn down this far, it's really not much more to replace the springs and lifters, or for that matter the roller rockers.
and while you're replacing those items, you can get a hotter cam, as well, as it's only 250-350 more dollars.
The bottom end should be solid, so you may as well just rebuild the top end to suit your needs. It's a 1500-2500 dollar job, what's a few more hundred dollars?
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Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
Could one of the pistons be misfireing if it's not in sync with the engine RPMs?
Just a curious question. do you notice a lack of performance?
I was thinking Engine Ping, need better fuel
or maybe a heat shield loose rattleing.
lifter sounds liek it could be that too.
Damn tapping noise can mean a billion things mayber it's mouse hiding in there with a tiny hammer pissing you off lol.
Loud Rapid Tapping noise on WOT or neutral rev around 5,000 rpms !!!!!!!! HELP 
