My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

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Josh19922
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My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » January 1st, 2019, 8:35 pm

My 5vz-fe 3.4 v6 sounds like a Diesel at 2500 3000 rpm in gear and out of gear anyone else had this problem and found a solution? I have posted on fair few forums can seem to find a correct answer just hoping someone has had the same issue

Video 1
https://youtu.be/b-HAbwTvXVA

Video 2
https://youtu.be/IzzRfRh_S0Y

Peter Aawen
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Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Peter Aawen » January 2nd, 2019, 8:58 am

Sorry Josh, not a Prado owner, but in the interests of giving you something to start with, I can't really hear anything untoward on either of the vids, altho it's often extremely difficult to pick up specific noises on youtube/different devices & besides, I'm becoming increasingly deaf anyway.... :o

Still, I'd guess that the first place to look for that sort of noise would be the exhaust system; so start at the exh manifolds/heads & inspect the whole thing very carefully for any indication of leaks, then work your way down the pipes to the very end! Pay particular attention to the head/manifold gasket areas & any 'v' joins where the collectors or pipes meet, as well as any expansion joints &/or the muffler itself.

If that doesn't reveal anything, you might be reduced to getting an assistant to hold it at the offending revs while you go over EVERYTHING with a mechanics' stethoscope (or a long screwdriver with the blade held on the spot you're listening to & the blunt end of the handle pressed firmly into or just behind your ear!) Probe EVERYTHING - injectors, fuel rails, plugs, rocker covers above each valve, alternator, a/c comp, water pump channels & rad hoses, radiator inlet & outlet, thermostat cover, water pump bearing, block alongside each piston/cylinder, sump under each con rod & main journal.... You might be surprised at what's actually making the noise that concerns you & what other noises you hear; sometimes noises come from the oddest of places & for the weirdest of reasons.... altho frequently the obvious possibility is correct!

Sorry I can't be of more help, but welcome to the Forum anyway! :thumb:
An Ex-Service person is someone who thought enough about their country & how great it is, how lucky we are to live here, to write a blank cheque made out to 'The People and Commonwealth of Australia' for the value of 'Up to & including my Life!'

Josh19922
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Posts: 6
Joined: January 1st, 2019, 5:30 pm

Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » January 5th, 2019, 6:31 pm

Thanks peter still a mystery

Josh19922
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Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » January 5th, 2019, 6:32 pm

Ok guys, after 2 days of looking haven’t been able to source the issue but another sound has arrived. When starting, it takes a little longer to fire and once it does there is a loud tick for about 3 seconds. People have suggested big end bearing, but since the noise started I've done about 15hrs driving, so I'm almost sure the bottom end bearing would have given way by now. Also, the engine is ticking louder than normal, almost sounds like it’s missing, but no loss of power. I hope this might help source the issue.

Josh19922
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Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » January 6th, 2019, 8:18 pm

Ok guys done my compression test today believe it or not all cylinders are between 190 180 psi its a lot better than expected for a car that has 326 Thousand kms it’s also rules out any valve or rod damage. engine noise still a mystery

Peter Aawen
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Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Peter Aawen » January 6th, 2019, 8:47 pm

I guess that's some good news, altho it doesn't really help too much in the diagnosis process, does it?! Just thinking about it tho, one other thing that can make 'diesel like sounds' in an EFI engine is faulty or failing injectors... generally they only make little ticking noises when they start, but when you finally have one go really bad, you'll be bloody horrified at the banging noises they can make!! First time I heard one go I thought it'd tossed a rod right thru the block! :eek:

Have you had it in to a Toyota dealer/specialist technician?? Wasn't there a recall for this sorta thing fairly recently? :purplex:





Edit: Going out on a limb just a bit, you haven't had a 'mate' put a longish zip tie around the drive shaft, have you?!? :sillywink:
An Ex-Service person is someone who thought enough about their country & how great it is, how lucky we are to live here, to write a blank cheque made out to 'The People and Commonwealth of Australia' for the value of 'Up to & including my Life!'

Josh19922
I'm new, be nice!
Posts: 6
Joined: January 1st, 2019, 5:30 pm

Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » January 9th, 2019, 10:54 am

Haha no zip tie but thanks for the idea haha could possibly be injectors but don’t want to play around with them I think it just needs to go in to the shop and hopefully they only find something small

Josh19922
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Re: My Prado 5vz-fe 3.4 v6 sounds like a diesel... anyone else? Any answers?

Unread post by Josh19922 » February 2nd, 2019, 6:35 pm

Ok guys, found the solution, not good news.

The issue: the cams have picked up alloy on the bearing journals and have way too much bearing clearance, heads can’t be fixed so I’ll be up for a new set of heads or a new engine!

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