evinX Posted January 17, 2017 Share Posted January 17, 2017 (edited) Hi all, every monday after the cars sat for the weekend i get this wobbly knocking sound from the top of the engine near the cams. Cant figure it out. Any ideas? Im thinking tappets but i dont know too much about engines, Been happening for months usually on mondays after is been sat for the weekend. *Goes away when revving *Comes back as soon as the idle goes stable *Intermittent, somewhat the same intervals as the clicking i had with the Automatic tensioner *Car pulls fine *Oil is clean, recently changed, no metallics https://www.youtube.com/watch?v=z_eSYTZF5Zw&feature=youtu.be https://www.youtube.com/watch?v=Idgaf1Tt9BY&feature=youtu.be Any ideas? Thanks Kev Edited January 17, 2017 by evinX (see edit history) Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 (edited) Edit. Edited January 17, 2017 by evinX (see edit history) Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted January 17, 2017 Share Posted January 17, 2017 Not tapids that something's knocking. How is it with higher revs? Try starting it without fanbelt too. Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 It goes away with higher revvs and as it settles back to idle it starts again Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted January 17, 2017 Share Posted January 17, 2017 It goes away with higher revvs and as it settles back to idle it starts again Could be something really simple. Check it in the daytime too. Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Thats the funny thing. Rest of the week i dont hear it at all. Got home many times...started in daylight and its gone Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted January 17, 2017 Share Posted January 17, 2017 (edited) I have the same thing with 1J and I went on a wild chase trying to figure it out. Noise is only experienced on idle, goes away with throttle. Fine when cold, but starts to appear when at operating temperature. Doesn't always occur, sometimes it runs fine! No negative effect on performance that I've been able to see. Symptoms are not reminiscent of what is found with a spun bearing or proper bottom end damage. IE: Sound is not tied to RPM. To date I've done the following: - Tested oil pressure -> Absolutely bang on as specified via the repair manual. No oil pressure loss as would be expected from bottom end bearings. - Switched oils -> Went from 5w30 to 5w50 to see if thicker oil would make it quieter. No difference - Checked over every bolt on the engine, made sure all was torqued to spec and nothing loose. - Double checked the valve clearances (all within spec). Although it was noted on my cam lobes there were a few wear marks. - Compression test showed that everything was healthy. - Removed Aux belt and sound still persisted, so not the auxiliaries or tensioner making the sound. - Went over every part of the engine with a stethoscope. Listening to the head and the block I could only hear the noise very faintly behind the engine noise. Strangely though, on the metal timing cover that sits behind the cam pulleys, the sound was loud and clear. My best explanation for that is that the sound resonated from it's source to that metal plate and is most vibrant there as the metal sheet is thin. Holding the metal cover with my hands dulled some of the noise, but I doubt that it would be solving the issue, just covering it up. - I then made a knock sensor headphone system that fed into an audio software on my laptop. After examining the sound waves, I could not find the noise appearing on the knock sensors, the valvetrain and pistons sounded ok. I probably did a couple of other tests but can't remember them now. Either way, I started to lose hope in diagnosing this issue. Internally, it seemed likely that it could only be a loose piston wrist pin or worn camshaft creating these noises. I was super close to completely taking apart the engine and investigating this At the same time as doing the above, I was looking up old youtube video's and threads about this issue and contacting people asking them if they ever solved the issue. I actually got a few responses, some saying they never solved it but have driven 30k+ miles on the engine and it's still going strong. One claimed that installing a new cambelt & tensioner setup got rid of the sound and another said a new set of camshafts fixed it for him. So far I can confirm that the sound is nothing catastrophic, performance does not seem affected in my case. My rough plan is to give my current 1J a rough 6 months for the summer season, if it survives, when it starts getting cold I will take it apart for a rebuild and hopefully I will find the source of this issue for once and report my findings somewhere. I'll also try the cambelt/tensioner change suggestion in the meantime. Also there are some people that have said that a slightly worn crank pulley or crank timing gear which has movement on the key they locate on can also creates this issue. Edited January 17, 2017 by Mike2JZ (see edit history) Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Ok great to hear its nothing serious...im on 200k plus kilometers now. So expect some wear and tear. On the other hand, bad news as we cant find the source of this. That metal plate near the cams...its very pronounced in that area...any chance of being the injectors making noise. I feel as though i can hear it from the rear driver side of the engine to....injectors run along that area. Kev Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted January 17, 2017 Share Posted January 17, 2017 Ok great to hear its nothing serious...im on 200k plus kilometers now. So expect some wear and tear. On the other hand, bad news as we cant find the source of this. That metal plate near the cams...its very pronounced in that area...any chance of being the injectors making noise. I feel as though i can hear it from the rear driver side of the engine to....injectors run along that area. Kev Checked injectors on mine and all running smoothly. Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 17, 2017 Share Posted January 17, 2017 Cam belt tensioner/pulley is a possibility. Just off to search a thread.... perhaps early stages of this? http://www.mkivsupra.net/vbb/showthread.php?303109-Strange-resonant-rattle&highlight=cambelt Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Cam belt tensioner/pulley is a possibility. Just off to search a thread.... perhaps early stages of this? http://www.mkivsupra.net/vbb/showthread.php?303109-Strange-resonant-rattle&highlight=cambelt Last year i replaced the Tensioner bearing and Hydraulic tensioner, that noise would idicate straight away that somethings not right in that thread, but the sound i have is very low pitched and seems like a vibration from something turning, being pronounced Quote Link to comment Share on other sites More sharing options...
Scooter Posted January 17, 2017 Share Posted January 17, 2017 Did you "grenade pin" the tensioner or just bolt it back in extended? Or perhaps the idler pulley needed thread lock (I can't remember if it does!) Something may have worked a bit loose, just something to check if it gets worse Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted January 17, 2017 Share Posted January 17, 2017 You did the tippex test on the crank pulley yes? Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 You did the tippex test on the crank pulley yes? Yep, plus it had a new one fitted last year Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Just went out for a drive, warmed her up, pulled on the drive with the stethescope, sweet as a nut. Cant hear anything like that, I did at one point hear 1 knock but it just dissapeared, everything else is smooth. I even heard the tappets/ buckets inside the rocker covers clicking away smoothly. Seems to only happen at night when im at work and shes on idle, and the temperature outside has dropped. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted January 17, 2017 Share Posted January 17, 2017 Maybe do a daylight vid too Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Maybe do a daylight vid too No point, daylight or night vision wont make a difference to the sound the engine produces, i captured the noise pretty well in the first vid Quote Link to comment Share on other sites More sharing options...
Stonkin Posted January 17, 2017 Share Posted January 17, 2017 Had a listen to your vids and the noise sounded identical to what I had with one on mine once. This was the thread http://www.mkivsupra.net/vbb/showthread.php?105787-Help-engine-making-knocking-noise!&highlight=knock the Videos I put up are not available anymore but I remember the noise well, sounds exactly the same. Despite mine being trailered off and inspected, no fault was ever found. So its not a huge help but just incase there is anything in that thread that may give you some ideas Quote Link to comment Share on other sites More sharing options...
jza800 Posted January 17, 2017 Share Posted January 17, 2017 (edited) I had the same knocking sound on my 2jzgte engine, and only on idle when hot, if i raise the idle alittle bit it dissapers, Mine was the timinggear on the crankshaft that had some play on the keyway, not much but it was enough to make that sound.. put new on and the knocking sound was away.. Edited January 17, 2017 by jza800 (see edit history) Quote Link to comment Share on other sites More sharing options...
evinX Posted January 17, 2017 Author Share Posted January 17, 2017 Ok cheers lads, going to look into the cambelt tensioner and crank pulley woodruff key, anymore suggestions welcome Quote Link to comment Share on other sites More sharing options...
RZtwin Posted February 9, 2019 Share Posted February 9, 2019 Anyone figure this out yet? Quote Link to comment Share on other sites More sharing options...
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