Hilux 4x4 Forum

Hi Guys

I have posted this on another forum, but thought I would post it here as well as we have many guys here that know the D4D's well. I have had the vehicle for just over 3 years now and close to 100k km on the clock.

"I have been experiencing a new noise from the engine in the last few months. Have been to Barloworld Tygervalley (BWTV) and after having the vehicle with them for a day and then also sending it to Motor Masters Engineering. Initially they thought it was piston slap, tappets, etc and that is why they sent it to the engineering shop. Engineering shop apparently confirmed no piston slap and everything sounds normal.

BWTV did hear the sound I was referring to, but their final answer was that they are not sure what it is and that seems to be the last of it. OK, so we dont know what it is, so its not a problem.....
Waiting for ToyotaCare to sort out their stuff as they will also be fixing gearbox whine and will then get them to confirm what the sound is and what they plan on doing about it.

Now the sound..it is very difficult to explain. It is more evident at between 1500 and 2100rpm and sounds like a cat that wants to say "FFFFFFFFFFFFFFF....foetsek!" It is also like it is heard more when the engine works more, like a bit of an incline at normal speed and constant throttle, not accellerating heavily as then you just hear the "tractor" sound over the FFFFFFFFFFF.

I 1st though maybe like a turbo pipe or something that has a leak, but according to BWTV that is not it....

This sound familiar to anyone? Any suggestions on where I can take the vehicle to have a 2nd opinion in Cape Town, Northern Subs?
I will also try and get an audio recording and see if the issue is audible.

This is on 2010 Fortuner, 3.0 D4D 4x4"

Thanks!

Just a thought... is there not possibly a crack/leak on the intake side causing a suction noise?

Sounds like a suction noise to me as well, did you check all vacuum pipes?

Thanks for the suggestions guys. To be honest this is not my strong point , so will see if I can recreate the noise with someone depressing accellerator and me having my head in the bonnet trying to figure out where it comes from :)

One would think that this would be something BWTV or at least the "engineering shop" would have checked as well.

Not familiar with those motors but from your description it could be suction (vacuum hoses etc as mentioned) or pressure - AFAIK there should be a turbo boost relief valve to relieve excess boost - perhaps this is faulty and discharging boost air. Are all the intake pipes secure (hose clamps etc.), no leaks on the intake manifold where boost pressure could be escaping ....??