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Discussion Starter · #1 ·
Hi guys, i need help from the 2JZ gurus.
I have a knocking noise on my 150k all stock auto turbo supra since i have the car( i drove 2000 miles with that noise) and it seems to not getting worse.
It appear only with warm engine and idling at 900rpm,the noise disappear at 1200rpm, nothing at cold.
The engine runs great and smooth and no knocking at all when i drive the car.
No smoke either.
I ve just checked and adjusted the valves clearances, replaced the whole timing belt kit and the drive belt tensionner, knocking still here ?
The camshafts and caps were clean, nothing to notice.
I know it s hard to say on video but the knocking seems coming from the head cylinder, nothing from the bottom.
I m wondering if it can be a bearing failure, i m ready to drop the subframe and the oil pan.
Any suggestions ? That thing make me crazy

 

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You can do the bearing test by pulling coil wires one at a time and seeing if the noise goes away. If it does, then you can start thinking rotating assembly issues. Usually you would hear it as you rev too. Just at idle is generally something else but anything is possible. The fact that it's getting worse may lend itself to rotating assembly as well.

I can't really tell much from the video. I hear it but its not like being there. Do you have a way of checking oil pressure? If it's low, you can pretty much guarantee bearing issues.
 

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Something easy to check and to rule out are the Torque Converter bolts. Remove the rubber cover on the trans and rotate the crank to check to make sure all the bolts are tight.
One could have backed out a bit and be hitting the case.
Good luck!
 

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Discussion Starter · #4 ·
You can do the bearing test by pulling coil wires one at a time and seeing if the noise goes away. If it does, then you can start thinking rotating assembly issues. Usually you would hear it as you rev too. Just at idle is generally something else but anything is possible. The fact that it's getting worse may lend itself to rotating assembly as well.

I can't really tell much from the video. I hear it but its not like being there. Do you have a way of checking oil pressure? If it's low, you can pretty much guarantee bearing issues.
Thanks, i ll do that and see what happen, i ll buy a oil pressure gauge to check the oil pressure

Something easy to check and to rule out are the Torque Converter bolts. Remove the rubber cover on the trans and rotate the crank to check to make sure all the bolts are tight.
One could have backed out a bit and be hitting the case.
Good luck!
Thanks, thats pretty easy to check that, i ll do it

I ll let you know guys, thanks again for the tips
 

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Discussion Starter · #7 ·
If you have a 96 or higher you should be able to read realtime oil pressure with a scan tool. Oreilly or autozone would probably be willing to check with theirs if they are cool.
Thanks bro but i can t it s a 93, i will do the coils and torque converter checks this afternoon i ll keep you posted
 

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Discussion Starter · #9 ·
My Mark II with a 1JZ also made a light, intermittent knock, only when warm and low idle. You can briefly hear it in this video I made, the sound is briefly audible at 5:36 https://youtu.be/l0CaDL6AphY?t=5m06s

Sounds similar to me, is yours intermittent also?
Yes it sounds like that, yes sometimes it goes away for 2 or 3 seconds, and did you find what it was?

Otherwise i ve checked the flexplate/torque converter bolts nothing wrong, and i ve disconnected the coils one by one, noise still present whatever i do
I ve checked with the car running on a lift, i can hear it from the bottom also
i really feel it coming from the rod bearings ��
 

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In my experience, rod bearings slap pretty hard of they're spun. That's not to say a more subtle knock is impossible but personally I wouldn't tear apart the bottom end of my engine until I had something a bit more solid to go on. If the sound doesn't go away when pulling coils then I doubt it's the bearings.

Are you confident the sound is from the lower engine and not transmission? Since the auto is notoriously weak I wouldn't rule out shaft rattle in the trans. I have had that before and it sounds similar to the video in the early stages.
 

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Rod knock is very audible and will keep up or get worse as the Rpms rise. Get an oil pressure gauge and see what it is at idle.

Steve
 

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bump

My car makes a semi-similar sound, auto as well. Car runs fantastic, sound appears to be coming around the 2nd or 3rd cylinder. But I have virtually no leakdown and great compression. Baffledm starting to think its normal and we are all just too anal...
 

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Discussion Starter · #15 ·
bump

My car makes a semi-similar sound, auto as well. Car runs fantastic, sound appears to be coming around the 2nd or 3rd cylinder. But I have virtually no leakdown and great compression. Baffledm starting to think its normal and we are all just too anal...
Same thing for me between 2nd and 3rd cylinders, me too great compressions and no leak downs, and sometimes no knocking at all.....i start to think my car is possessed by a poltergeist :0, but i cant say its normal, i ll hit the road to SIV like that and see what happen

A mechanic's stethoscope ($15) can help you track it down.
i have one, that thing is great to chase parasitic noise, but that one is really hard to locate
 

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When I'm trying to track down noises like this I use what's called a chassis ear. I used it to diagnose a differential most recently. We couldn't quite determine if there was an issue in the hub,suspension or diff. Turned out the spider gears were out of tolerance on backlash and shimming. It was TINY but we were able to isolate it by tying the little microphones to different points on the rear end. Then just drive and listen!
 

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Hi guys, i need help from the 2JZ gurus.
I have a knocking noise on my 150k all stock auto turbo supra since i have the car( i drove 2000 miles with that noise) and it seems to not getting worse.
It appear only with warm engine and idling at 900rpm,the noise disappear at 1200rpm, nothing at cold.
The engine runs great and smooth and no knocking at all when i drive the car.
No smoke either.
I ve just checked and adjusted the valves clearances, replaced the whole timing belt kit and the drive belt tensionner, knocking still here ?
The camshafts and caps were clean, nothing to notice.
I know it s hard to say on video but the knocking seems coming from the head cylinder, nothing from the bottom.
I m wondering if it can be a bearing failure, i m ready to drop the subframe and the oil pan.
Any suggestions ? That thing make me crazy

Hey mate

Sorry to revive this, I have the EXACT same issue!
Only hear this knock at low RPM Idle when warm....

Automatic, 2JZ-GTE

Did you find out what the issue was?
 

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I had a similar issue on my 1jz, at idle it would intermittently make a knocking noise, ended up changing the harmonic balancer and the noise went away, but I also noticed on further inspection that the lower timing cover had swelled from past oil leaks and was intermittently contacting the rear of the harmonic balancer while running and warm. Just some things to look at possibly, hope it helps.
 

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I had a similar issue on my 1jz, at idle it would intermittently make a knocking noise, ended up changing the harmonic balancer and the noise went away, but I also noticed on further inspection that the lower timing cover had swelled from past oil leaks and was intermittently contacting the rear of the harmonic balancer while running and warm. Just some things to look at possibly, hope it helps.
Hey mate

I just booked my car in with a shop 2 weeks from now. Hopefully they can find out what the noise is.

I've driven it a few times, and oil pressure is fine, the knocking goes away above 1000RPM, and I flushed the Oil and changed the Oil filter, no signs of debris.

I will be sooo happy if its something simple like the Lower Timing cover hitting the balancer.

Biggest fear is it's a Spun bearing, because I don't want to pull the whole engine out for a rebuild, but I guess we will see.

My friend's a mechanic and he had a look, he said it sounds like a spun bearing, but usually the noise would get worse with higher revs, and spun bearing can affect oil pressure but my oil pressure is perfect, so he's not sure.

So I'm taking it to a specialist Performance workshop to investigate.

@A70Addict, appreciate the reply, because I'm going to ask them to check for this, I did have some leaks that were fixed not long before this noise started.
 
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