1HDJ78R 2003 troopy. vibrating noise under bonnet

Probably need a bit more to go on.

In gear 1st or higher? At 60kmh etc? Just when you give it a rev?

I would be checking the fan belts to see if they are tight.

Also check your fan is ok and not collapsed in the hub - or any of the other pulleys especially the tensioner pulley.

Might also be a bubble in a front tyre - so check for consistent wear pattern on your tyres.

Also had a wheel come loose once and when slowing down there would be a rattle. Bit hard to tell when stopped as the weight of the car kept the tyre pretty solid. Ended up getting someone else to drive the car slowly while I walked alongside - didn't take long to find the wheel was loose.

Hope that helps.

Serendipity

Take it into Toyota. They have had a small device that is fitted into fuel line & should be covered under warrenty. A good friend was the 1st in Oz to trial it. On cold mornings the fuel hammer used to drive him mad.
Cheers Craig......

Troopy,

That noise comes in about 1,200 revs, but soon disappears as you increase revs. I've got an '02 model, and it's done it since new. The retro fit is a small black canister in the fuel line, that bolts to inlet manifold.

Gives it a bit of character, I reckon.

Bob.

I agree with Crackles and Bob that it is most likely normal - it's vibration from the injector pump that gets transmitted to the metal fuel pipe that sits on the firewall. Toyota in their wisdom decided to leave the dampener off the 2001- early 2003 1HD-FTE 70 series just to save a couple of dollars in the commercial models.

I had the little black vibration dampener fitted by Toyota under warranty in 2005, and most of the sound went away - still hear it a little bit at low revs.

When my 2004 HDJ79-1HDTFE reached approx 50-60000 kms a very harsh vibration noise seemed to be coming through the firewall area. When I went to Toyota they said nothing to fix as it already had a fuel damper fitted. Recommendation was to try all rubber fuel hose from pump to metal fuel lines at lower RHS floor area near chassis to tank. this did alleviate problem vibration noise which at times around town was absolutely annoying.

I have now reconnected all original lines and the noise come back immediately so I have disconnected fuel pipe bracket from the firewall at the RHS of firewall as it drops down under the vehicle to the fuel tanks. Low and behold the noise is lessened by I would say about 60%, so i will try disconnecting the fuel pipe bracket at the LHS of firewall and see what occurs.

I will probably acquire a studded rubber cushion mount to fit under these brackets or If not enough room will try to insulate the brackets some other way. I have driven other 79 series with the same noise, some worse than others at varying kilometres. The same damper setup on the same engine in the 100 series doesn't seem to have these problem noises, but they are a lot better insulated firewall/underfloor areas being a passenger carrying vehicle and not commercial.

Cheers Kev.