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Hi there,
I've posted this here because I'm not sure what's wrong with my Prado. I'm hoping someone can help. I've posted in an older thread about this issue but thought I'd start a new one to track progress just in case someone else has a similar problem they're trying to fix.
It's a dual fuel Prado, 250k kms, 1999.
Problem 1: Slight whine/whistle, like a dry bearing from the front of the car. Thinking front Diff or front wheel bearing but haven't ruled out CVs (not clicking when parking though). The noise is present when the vehicle is in motion, gets louder with speed and engine load. Reduces when cruising on a level road, gets louder though once the engine/drivetrain loads, say up a slight incline. Still present when coasting in N. No change swerving left to right and is consistent regardless of road surface and no rotational hum which is typical with a dying wheel bearing. I'm about to have the diff fluids changed, and am thinking of getting the xfer case and gearbox flushed also. The colour of the fluids should tell me what condition the components are in. Any other ideas?
Problem 2: Car vibrates under load at low revs. This happens when cruising and slightly loading up the drivetrain, can't be replicated in the driveway. Disappears on a level road or if you come off the accelerator. No wobble in N at any speed so can't be wheel/tyre related. I did a bunch of reading and thought it was the drive shaft or u-joints. Had them both removed, inspected and re-balanced at a specialist. They said the splines were slightly loose, so reversed the front w/rear and it tightened up, they also said the shaft was slightly bent but rebalanced it and the u-joints were loose, needed tightening and new clips. This has almost completely eliminated the wobble/vibration when running on lpg. Running on petrol though, the car lurches significantly at low revs (1.5k -2.2krpm) when loading up the motor as though it's missing. In the driveway the car is fine reving in N but in D it does shake the car at 2k rpm (lpg is smooth). I think this is a seperate problem to the drive shafts to be honest but manifests in similar situation to the driveshaft issue. Any ideas where to start?
Any advice appreciated. Thanks.
I've posted this here because I'm not sure what's wrong with my Prado. I'm hoping someone can help. I've posted in an older thread about this issue but thought I'd start a new one to track progress just in case someone else has a similar problem they're trying to fix.
It's a dual fuel Prado, 250k kms, 1999.
Problem 1: Slight whine/whistle, like a dry bearing from the front of the car. Thinking front Diff or front wheel bearing but haven't ruled out CVs (not clicking when parking though). The noise is present when the vehicle is in motion, gets louder with speed and engine load. Reduces when cruising on a level road, gets louder though once the engine/drivetrain loads, say up a slight incline. Still present when coasting in N. No change swerving left to right and is consistent regardless of road surface and no rotational hum which is typical with a dying wheel bearing. I'm about to have the diff fluids changed, and am thinking of getting the xfer case and gearbox flushed also. The colour of the fluids should tell me what condition the components are in. Any other ideas?
Problem 2: Car vibrates under load at low revs. This happens when cruising and slightly loading up the drivetrain, can't be replicated in the driveway. Disappears on a level road or if you come off the accelerator. No wobble in N at any speed so can't be wheel/tyre related. I did a bunch of reading and thought it was the drive shaft or u-joints. Had them both removed, inspected and re-balanced at a specialist. They said the splines were slightly loose, so reversed the front w/rear and it tightened up, they also said the shaft was slightly bent but rebalanced it and the u-joints were loose, needed tightening and new clips. This has almost completely eliminated the wobble/vibration when running on lpg. Running on petrol though, the car lurches significantly at low revs (1.5k -2.2krpm) when loading up the motor as though it's missing. In the driveway the car is fine reving in N but in D it does shake the car at 2k rpm (lpg is smooth). I think this is a seperate problem to the drive shafts to be honest but manifests in similar situation to the driveshaft issue. Any ideas where to start?
Any advice appreciated. Thanks.
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