2011 Tacoma 4.0 v6 intermittent knock

I've got a 2011 Tacoma that makes a helicopter knocking sound intermittently. no cel codes. only seems to do it when its warmed up, It seems to be from front of engine. any ideas? thanks.

 

bad EGR valve?

 

I too just got this last night. Traveling about 50km/h, Rpms around 1500. The knock was quite loud and constant with the revs. Went away after a minute Shut off the truck and fired it back up. Drove 3 km and it came back while accelerating, I rolled down the window and it was a loud knock, again 1500-3000 rpm constant with rpms. I've read there is loud toyota tick, but this however is a loud knock.


Running 5-30 syn, 91 octane, 6000 miles on the dial

 

Automatic transmissions? Probably this:

http://www.tacomaworld.com/forum/2nd-gen-tacomas/230991-2012-v6-dcsb-engine-knocking-1500-rpm.html

Have fun dealing with Toyota.

Oh, to the person that said "EGR", there is no EGR on the 4.0L. EGR function is handled by VVTi, using valve overlap.

 

Saw that thread too. My dealer is pretty good with going above and beyond to fix anything so I'll let them know.

Would it matter that I did my own oil change? I used a toyota filter and RP 5/30 synthetic.

 

My six speed taco did something like this with a vengeance. It would only happen after the engine was fully warmed up, shut off, and left to sit for ~10 minutes. Then after restart when driving with any rpm over 1400 or so it went whack whack whack for about a mile. Not a harsh banging noise like rod knock, more like piston slap on steriods, but very very loud. I never made the connection back then but it did sound much like a helicopter.

Never did figure out what it was. I only put 26k on it before I sold it. Engine never used any oil either, although it was losing about a quarter litre of coolant somewhere every six months or so.

 

Subd

 

There Was a partial blockage in the oil filter. New filter so far runs great

 

What brand of filter ?

I use the OEM filter and have never had a problem like that

 

More to the point, what caused the blockage? Was it a bad oil filter? Was it debris from inside the motor?

I've noticed on my 4.0L that, using OEM filters, if the truck sits for a week or so, and I start it up, it takes a second for the oil light to go off. The anti-drainback valve isn't doing it's job, I guess.

 

Mobil1 filter. Thought I used the toyota one but guess I should read it next time. As soon as I put the toyota one on, the light instantly turned off on a cold start where as before it took a couple seconds.