landcruiser engine trouble

Submitted: Thursday, Oct 12, 2017 at 23:41
ThreadID: 135737 Views:1256 Replies:8 FollowUps:6
G'day all.
it seems my landcruiser 76 is making some rather odd sounds and im wanting to draw on the wealth of mechanical knowledge on some suggestions as to what it could be.
it goes like this. whenever i accelerate at any throttle. and when the revs build to just under 2500rpm i hear a rattle that then goes away as suddenly as it comes on. it started as almost a chirp then has manifested itself into a much more audible rattle. also i would like to mention it is most notable in 3rd gear and it didnt get any better when my dad accidentally put 10ltrs of petrol in the tank (it was definitely there prior)
also i think i heard it at just past 3000rpm this afternoon.
any ideas i was thinking injector rattle (has done 100,000kms) but i was under the impression that this would be through the whole rev range ?
Any thoughts experiences even just ideas are greatly appreciated in my quest for a solution.
Cheers jet.
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Reply By: Member - Trouper (NSW) - Friday, Oct 13, 2017 at 16:48

Friday, Oct 13, 2017 at 16:48
Injectors maybe. They can sometimes get the 'rattles up' as you said
Cheers
AnswerID: 614309

Reply By: Athol W1 - Saturday, Oct 14, 2017 at 09:40

Saturday, Oct 14, 2017 at 09:40
Jet
A little more information as to what year model and engine type will help, and also get you a lot more answers.

10% petrol in an older, pre common rail, would be unlikely to have any lasting effect, however it may be a different story in a common rail engine with their extreme high fuel pressures.
Regards
Athol
AnswerID: 614322

Follow Up By: 76lifted - Saturday, Oct 14, 2017 at 12:02

Saturday, Oct 14, 2017 at 12:02
sorry i should have mentioned it is a 2012 v8 pre standard diff locks

in regards to injectors will they constantly make noise or only sporadically in the rev range

Cheers jet
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FollowupID: 884909

Reply By: swampy - Saturday, Oct 14, 2017 at 10:54

Saturday, Oct 14, 2017 at 10:54
hi
petrol in a late model diesel assuming DID can be a death sentence .
Remove pump and injectors and have them tested . Repair if needed .
Drain tank
Flush lines
change filter

When the clearances become to big in the injector a rattle can be heard . Hiluxs do this also .

Remove glow plugs and inspect .
Carry out a compression check also.

Toyota have changed injectors on the Hilux every 2nd year since 2005 . The v8 would be no different .

DID injectors suffer from wear not only in Toyotas .
AnswerID: 614324

Reply By: Member - Roachie - Saturday, Oct 14, 2017 at 13:01

Saturday, Oct 14, 2017 at 13:01
If it's not too late for injector pump, I suggest you consider fitting one of these:

https://www.youtube.com/watch?v=x4LCbGsujdU&t=88s

It's a long video, but I recommend every owner of a common rail diesel watch it.

I have the larger 150 version on the Chevy, but Japanese 4x4s would only need the 95 version.
Roachie
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AnswerID: 614325

Follow Up By: Frank P (NSW) - Saturday, Oct 14, 2017 at 17:59

Saturday, Oct 14, 2017 at 17:59
That's fascinating, Roachie. I never thought of air in the fuel as a pollutant, much less the implications of it.

Where does all this fuel treatment/filtering etc end???
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FollowupID: 884913

Reply By: MUZBRY- Life member(Vic) - Saturday, Oct 14, 2017 at 13:34

Saturday, Oct 14, 2017 at 13:34
Gday
On your next fuel up, put a dose of two stroke oil in with the fuel , it cant hurt , but could do some good with a bit more lubrication.
Muzbry
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AnswerID: 614326

Follow Up By: Les - PK Ranger - Saturday, Oct 14, 2017 at 19:13

Saturday, Oct 14, 2017 at 19:13
It will hurt Muz, IF you put anything but the right 2SO in the diesel !!
Must be full mineral like Castrol Activ 2T JASO FC (low ash), ratio 200:1.
I used to use it religiously, until I happened upon a PDF report about zinc problems long term, even with the right 2SO, so after finishing off the 2nd 20lt I didn't get any more.
No biggy it seems, most of the fuels have enough lube / additives etc it seems, one less thing to worry about.
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FollowupID: 884914

Follow Up By: MUZBRY- Life member(Vic) - Sunday, Oct 15, 2017 at 12:28

Sunday, Oct 15, 2017 at 12:28
Gday Les
I best do a little more homework , thanks
Muzbry
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Reply By: Bob Y. - Qld - Saturday, Oct 14, 2017 at 17:12

Saturday, Oct 14, 2017 at 17:12
It's not harmonics in your exhaust system is it, Jet? Sometimes the exhaust can make noises if there is a fault in the mounting system, or a loose baffle in the muffler.

But then the addition of the ULP shoots my suggestion down I'd say?

Bob

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AnswerID: 614329

Follow Up By: 76lifted - Saturday, Oct 14, 2017 at 23:28

Saturday, Oct 14, 2017 at 23:28
the sounds was present prior to the ULP however we have had a 3 inch straight through turbo back exhaust fitted for abt 20,000kms and have had no issues
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FollowupID: 884919

Reply By: Member - Trouper (NSW) - Monday, Oct 16, 2017 at 11:16

Monday, Oct 16, 2017 at 11:16
As a motor mechanic friend (of 50 years) says to me constantly that we always have a tendency to think the worst. He says always look for the simple less complicated causes first. I always 'try' to think that way but I think human nature is against us. Example: my self installed central locking system started working intermittently after 4 years so I checked connections, checked the fuse, checked master unit in the drivers door, checked remote sensor unit. changed the battery in the remote control. still intermittent fault after a day of frustration. Next day in fustration I rechecked the fuse and replaced it. Bingo problem solved. The fuse on close inspection with a magnifier discovered the fuse wire had a fine crack in it which you could not see with the naked eye. Bugger!!
So there you go.
Jet, I would look at your exhaust. My 1HZ Troopy has a similar chirpy whistley noise at 2600 RPH disappears at 2650 after that. and its coming from the exhaust I'm guessing its been there for 10 years. and yes the injectors were routinely changed 18months ago its no big deal for me I just treat it as 'one of those things'

Cheers.........Jeff
AnswerID: 614364

Reply By: Baz - The Landy - Friday, Oct 20, 2017 at 14:56

Friday, Oct 20, 2017 at 14:56
Something to do with this perhaps?

76lifted - Drowned vehicle

Cheers, Baz - The Landy
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AnswerID: 614462

Follow Up By: 76lifted - Friday, Oct 20, 2017 at 15:08

Friday, Oct 20, 2017 at 15:08
well.......very possibly ;)

however it did come up quite a while later i have had a mechanic look at it and he seems to agree with all those people who said the ULP was a large contributor however after a beach run on monday the revs a which the noise occurs has dropped from near 2500rpm to just a hair over 2000rpm so is abit confusing

Cheers jet
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FollowupID: 885075

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