ok well i just picked up a 92 yota pickup. I have noticed that it has an inconsistant knock. it does it mostly at partical throttle and goes away when i give the truck more throttle. i have been driving the truck like this since i bought it a month ago and it has not gotten better or worse. have noticed after a while of driving it that at 4k the truck has run out of power. could just be cause its stock and the cam does not make power after 4 but just want some input from people who have more knowledge.

thank you for reading.

dave

 

update. Low oil pressure think oil pump is weak. has good pressure at start up then after a few mins the pressure drops to first quarter mark and below. but the truck still sputters no matter what. so i think an o2 sensor is bad but at least there is no knock at all when the pressure is good.

 

any suggestions on best oil pump to get, price and durabilty wise?

 

That's normal pressure on the stock gauge. Hook up a manual gauge to verify oil pressure. Your oil pump will not cause the engine to lose pressure after a few minutes. Either it's a faulty gauge (normal for the 3VZE) or worn main bearings. My engine is in good shape with plenty of oil pressure however the factory gauge shows just under a 1/4 of the way at hot idle.

 

Actually, as the engine warms, the oil will thin slightly and bearing clearances will grow slightly.

You might try a step or two heavier weight oil and see if that alleviates the noise. If so, start preparing for a rebuild... in my opinion.

 

Have you pulled codes on the engine yet? Do that first.

What type of knock are we talking about? The fuel pressure regulator can make a helluva ticking noise....

 

mileage??? Have you replaced anything since you bought it??
try a thicker grade oil, that should get her to stop being so mouthy!! Also, she should def be "picking up" at 4 grand...

 

i run 10w 30 in it at the moment...i have only had the truck for a few weeks now and i have done nothing to it. the truck has 177k. and its strange because it only makes the noise a partical throttle then goes away when i step on it a little more. i am going to put the truck on the scanner tomarrow because it sputters at idle and when im trying to cruise.

thank you guys for helping me out..i love the truck and just want to try and make the ol girl happy again

 

and to answer your question TN is a deeper knock then a tick..but it makes no knock at all at idle...purrs but has a stutter

 

I'm still going to suggest going to a heavier weight oil, maybe 15w40 or even 20w50.
It's sounding more and more like rod "little end" bushings/bearings from what I'm reading, if it is a knock and not a tick.
Out of curiousity, would you describe it as a real quick 'double' knock or a single knock?

 

a single fast knock then goes away with more pedal

 

but actually now that i think about it, it could be either haha

dianosing bottom end issues is a pain

 

i had similar oil preasure problems when hot or at least thats what the gauge tells me, i switched to 20w 50 and it seams to have helped that problem considerably. as for the power mine seams to top out at about 4000 as well

 

any knocks kenbo? or just low pressure?

ya it just seems to not have anything left after 4k. you running 31 10.5's too?

 

ok guys i jump te1 and e1 and got the code...it flashed 5 times then paused and flashed 2 times...how do i decode that? or does anybody know what those codes are?

thank you

also picked up 20w50 oil and thats my next thing inline

 

ok figured it out...code 52 which is knock sensor..could that be my knocking after all? and would that cause my stuttering also?

 

Most likely it's the pigtail that runs from the wiring harness to the knock sensor...

 

is that expensive? haha

 

thank you so much for the help TN. i just looked it up and it said like 13 bucks for the wire.

think that was my problem all along?

 

The wire is easy; it's taking the top end off that's a PITA~

That code wouldn't explain your knocking sound, however...