[ravi shankar]

Hi guys
I have been getting real good advice and feedback here like so many; this is a great forum. I hope u can help me out on this one.
recently had engine rebuilt (with a new timing chain kit, and rings) but the engine knocks and pings.
with premium gas, noise disappears. regular gas, its back. i put seafoam to clean injectors. but still noise there with regular gas.
a mechanic suggested the fuel injectors are leaking.
any other thoughts? advice?

much appreciated!

 

[Blogson]

I don't know how "leaking fuel injectors," whatever that supposedly means, could cause the problem you are having. In pre-ECU days the pinging problem you are having could be caused by improper ignition timing or having a compression ratio which is too high for regular fuel. It is possible that the original computerized engine management system is not the proper one for your rebuilt engine. Other forum members may have other ideas.

 

[skitter]

Sounds like a bad knock sensor.
I suppose there could be air leaking past bad O-rings on the fuel injectors, that could cause it run lean and make a pinging sound. But it seems like that would cause it to idle bad.
No trouble codes or check engine lights?

Knock sensor for a 04 rav4.

View attachment rav4 eng control system knock sensor.pdf
pdf showing the location of a 2az-fe knock sensor

 

[ravi shankar]

codes were fine, idles fine, no lights,a buddy also suggested knock sensor.
thank you

 

[skitter]

Cams and timing chain installed correctly? Timing chain tensioner in good condition? I can't think of anything else.
There was a history of intake noise with the 2.4L engine. I attached a pdf from Jasper engines concerning the intake noise.

View attachment Toyota24EngineNoiseTB.pdf

 

[MNRAV4]

Timing chain tensioner in good condition?

View attachment 54930

I wonder if the timing chain tensioner was installed correctly when everything was put back together? sounds like the timing is advanced too much

if the chain were off one tooth, or the tensioner, which also advaces the timing weren't doing its' job correctly ....

not sure if that could cause the symptoms or not, but it is worth looking into

my opinion is that the leaky injectors is BS, if premium gas cures the problem, it sounds like a timing issue

 

[ravi shankar]

the guy that did it is a good guy with a good reputation
he did put a new timing chain kit and he has done so many engines before, i doubt that on mine he put it off somehow
thank you