3RZ 2.7L Question

[PrezidentRedz]

I have a 2000 Taco 3RZ 2.7L and it has about 73thousand miles on it, when its cold the motor knocks kinda bad! any idea what it could be??? i was thinking the timming chain maybe! but it doesnt do it or atleast bad when it warms up?
any suggestions would help alot.
Prezident Redz :!:

[TURNER]

mine does the same thing, no idea what it is or why it happens, but i do know that it only for a minute so i dont really worry about it. it also only happens in the morning, even if my truck sits at work all day in the cold it wont do it when i start it up to go home. i would imagine that as long as you dont flog on it before its warm it not that big of a deal, but you should let your junk warm up anyway

[moe.taco]

A cracked/leaking exhaust mainfold is your culprit. I had the same problem a couple years back. I put an LCE header on and haven't heard that sound since.

Pete

[PrezidentRedz]

Umm ill check in to it, i would love to get a header but dont have to finaces to do that yet!, i normaly let it warm up, but some times im running late for work and got to bolt out the door, i guess i can get Toyota to look @ it. and see what they say since it shouldent cost me any money!

[Bsmi16490]

The mainfold on my 22re did the same thing, I may have a used 2.7l manifold I can get my hands on if yours is cracked

[TURNER]

i figured my was cracked, ill replace it eventually....

[PrezidentRedz]

ok ill see what i can look @ it. hey bsmi6490 can you PM me of you find that manifold. and let me know what kinda shape its in. thanks guys. so I maybe im asking a dumb question. but why would a crack cause the motor to knock???