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Engine Knocking! :( Big End Bearing!

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RS Tom-Hundred
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Engine Knocking! :( Big End Bearing!

Postby RS Tom-Hundred » Wed Jan 14, 2015 10:41 pm

Hi guys, really could do with your help please as I've got a serious knocking/rattle that has come on very quickly today! Had a search on here and came back with a few things but nothing that seemed to point straight to it (apologies if it is my searching skills and missed something). Hoping someone will recognise the noise from a video please.

It happens whether I'm is driving or if just revving and not in gear. Doesn't do it on idle but starts after about 2k and gets worse around 3 or 4k. Tried it once above that (was too scared of f*** something up to do it again!) and couldn’t hear it from inside the car cos of other engine/exhaust noise. Only tried it more from inside the engine bay working the throttle so couldn’t accurately judge the revs (and still didn’t want to push it too high)
The noise seems to be coming from the top of the engine and from the right (exhaust) side cam. Also seems to be nearer the front (sprocket) end. Weirdly, it is more of a knock than a rattle like a big end noise but definitely seems higher up and also seems to be more "in time" with camshaft or specific cylinder than at the crank. Also I would have thought there may be some feel in the transmission maybe if so of that it would have been more gradual than not hearing any noise to it being like this tonight.

Just in case it is important, I stopped at some traffic lights suddenly cos someone pulled in front and cut me up last minute! As I was shouting road rage, I must have forgot to put it in 1st gear cos when they changed I tried to pull off and stalled cos it was in 3rd! I first noticed the noise about half a mile later. Can't see how the stalling it first would cause the issue but thought it was worth mentioning just in case :)

Here's a link to the video on Youtube (hopefully)

http://youtu.be/QmD-Z0y7VIM" onclick="window.open(this.href);return false;

Anyone know what the noise is please? Any suggestions or things to try would be greatly welcome :)
Last edited by RS Tom-Hundred on Wed Mar 11, 2015 9:37 am, edited 1 time in total.

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Re: Engine Knocking/Rattle! :(

Postby Trd Shane » Wed Jan 14, 2015 11:47 pm

Auch that don't sound healthy .. Sorry I can shed light on where it is or what it is .. But hope you get it sorted man ... Sounds like it could hurt the wallet ... Keep us updated man .. Hope it's something simple ... No worse feeling than hearing a nasty noise
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RS Tom-Hundred
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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Wed Jan 14, 2015 11:59 pm

Thanks mate :) I was (and still am a bit!) scared of the potential big problem this could be but feel a bit better after talking to my Dad about it and he is optimistic that it sounds like a top end issue rather than a bottom end one from the video and his experience (he is retired recently but was in the trade) so fingers crossed!

Hopefully someone on here will have some suggestions and or a good idea what the noise is and I can start investigating and track it down! Hopefully the fact it came on quickly and that I havent (and wont) have to use the car more will be a positive thing to getting it sorted too :)

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Re: Engine Knocking/Rattle! :(

Postby Gojira san » Thu Jan 15, 2015 1:12 am

Timing belt. +valves/valvesprings. is my guess from the vid. and a mechanic recently mentioned something about a knock related to low fuel quality at high rpm, so if you have been running poor fuel, try a fuel system cleaner, and refil with premium. -no dice? my first stop would be a new timing belt.

Tomorrow, i can show the vid to the smartest mechanic i know. (30+years building racecars a HKS dealer, and a Toyota specialist) if he shakes his head? your wallet is about to get lighter. here's hoping..........


Also, a ECU reflash never hurts when weeding out engine issues.

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Re: Engine Knocking/Rattle! :(

Postby mlcoolj » Thu Jan 15, 2015 6:51 am

maybe itś your vvti cam gear (don´t know if that´s how it´s called...). It´s indeed in the top end front .. these... Image Read somewhere on here that they can rattle when they go...
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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Thu Jan 15, 2015 9:54 am

Gojira san wrote:Timing belt. +valves/valvesprings. is my guess from the vid. and a mechanic recently mentioned something about a knock related to low fuel quality at high rpm, so if you have been running poor fuel, try a fuel system cleaner, and refil with premium. -no dice? my first stop would be a new timing belt.

Tomorrow, i can show the vid to the smartest mechanic i know. (30+years building racecars a HKS dealer, and a Toyota specialist) if he shakes his head? your wallet is about to get lighter. here's hoping..........


Also, a ECU reflash never hurts when weeding out engine issues.


Thanks, that would be great if you can show him and ask him what he thinks :) The belt was changed at the right interval so wouldn't have thought it was that (is there any way to check?) Could be coming from valve or camshaft area though and the frequency is about right for that (rather than more regular like a rod or crank etc) Ive only ever run it on 99 RON fuel (and so has the previous owner from what he said)

With regards to the cam gears, mlcoolj, is there any way to check these or rule them out easily? Will have a search on here for threads related to that though :)

Thanks for all the help :D

There is no engine light on the dash. I haven't got a Toyota reader but I have got a bluetooth OBDII reader that seemed to show some stuff when I tried it a month or so ago (eg. Voltage seemed right but though weirdly the water temperature showed 160°! LOL). If that method doesn't work, is there a way of jumping the connector to show codes? (obviously I will have a search for it but thought I would ask in the meantime :) )
Worth a go to see if it shows anything, so I'll do that first :)

My next plan is to start it and listen to the exhaust to see if there is any missing at that end.
Then do the same at the intake end with the air filter out briefly (as a side note, I've got the air box loose temporarily cos after I took the engine cover off to listen at the noise I dropped one of the bloody bolts down behind it! LOL I haven't run the engine like this though so that's not connected to the issue. Also need to drill the bolt out on the slam panel that holds the air scoop on cos that snapped :( ) Hopefully after listening to both sides it might maybe give a clue as to whether it's exhaust or intake side if there's a missing being heard?

After that I suppose it makes sense to clean the MAF and reset the ECU while the air scoop is off just in case. Does the engine check light usually come on with MAF issues.

Thanks again :)

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Re: Engine Knocking/Rattle! :(

Postby G-TECroscommon » Thu Jan 15, 2015 2:39 pm

would you be able to post a video on youtube and give us the link, some engine are very easy to diagnose by the sound!
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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Thu Jan 15, 2015 2:50 pm

I have mate and the link is in the OP :P

And here now too :)
http://youtu.be/QmD-Z0y7VIM

Cheers :)

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Re: Engine Knocking/Rattle! :(

Postby G-TECroscommon » Thu Jan 15, 2015 4:30 pm

RS Tom-Hundred wrote:I have mate and the link is in the OP :P

And here now too :)
http://youtu.be/QmD-Z0y7VIM

Cheers :)

my bad :roll: i just had a quick skim through the thread :lol:
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RS Tom-Hundred
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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Thu Jan 15, 2015 4:42 pm

Haha, no worries :P Let me know what you think :)

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Re: Engine Knocking/Rattle! :(

Postby Tosh21 » Thu Jan 15, 2015 7:56 pm

It's probably irrelevant to you but I drove without the engine cover on once and a little stone got launched at the block and jammed itself in the oil pump gear and started destroying the belt and made that exact sound. Lucky I got home without breaking it, it was almost shredded by the time I got home! Have you checked that nothing hasn't just come loose?

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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Thu Jan 15, 2015 8:16 pm

Just to update, Ive done a fault code read using my bluetooth OBDII thing and seemed to work cos the voltage was showing on the app and the throttle position was accurate. When I looked for codes there werent any on there.

Thanks Tosh :) I'll take the cover back off and poke a torch down there to have a look but as was spinning over (and as in video) the belt looked ok.

When you say loose stuff do you mean near the belt or just generally around the engine bay?

Or inside the engine? I haven't took the cam cover off yet. Is it an easy job to get it off and do I need a gasket for when I put it back on? Wheres the best place to get these?

Trying to pin point something a bit more solid and then save these type of jobs for daylight hours at weekend probs.

Does anyone know much about the oil control valve filter? I spoke to a guy on another forum with a JDM Celsior and on the VVTi system there is a little filter that caan clog up and stop oil delivery to the VVti stuff - might be worth looking at / replacing for piece of mind anyway?

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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Thu Jan 15, 2015 11:09 pm

Wasted most of rest of night trying to drill the broken bolt out (cos my mains drill stopped working and the battery one was next to useless so think i need a new mains one to do it!)

Also whipped the coil packs off to look in there though and worryingly, they all seem to have oil on! Is this likely to be part of any issue I have or will it just mean I need new gaskets and not connected? I got photos but not great cos its dark and late here. I will upload them in the morning though :)

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Re: Engine Knocking/Rattle! :(

Postby Soiled » Fri Jan 16, 2015 12:08 am

Oil on the coil is quite common, just the gasket weeping. Don't stress unless it's starting to puddle.

I was going to say VVT-I cam gear before I watched the video... then after I watched it I thought... no f*** idea :p I wouldn't rule out a bent rod though.

Take a screwdriver put it to your ear and touch things to try narrow it down. Think this is in the too hard to diagnose over the internet basket.

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Re: Engine Knocking/Rattle! :(

Postby RS Tom-Hundred » Fri Jan 16, 2015 12:25 am

Thanks for the reply :-)

That's good about the plug gasket. I'll check better in the light at weekend :-)

Thats interesting what u say about cam gear. What sort of noise were u expecting to hear for that before u watched the video btw?

Sounds like a plan. I did intend to do that with screwdriver yesterday night but seemed obviously from front right of engine that I didn't bother. Will do it when I do my next round of checks though cos noise can sometimes travel and play tricks :-)


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