Hi, I have searched all the threads I could find, but can't find anything similar to the noise my 2007 D4D Prado (automatic) is making, which has done 160,000km.
The problem is an intermittent heavy diesel knock when the engine is hot and cold.
Sounds something like a big end knock/rattle, or no oil in the engine, on light to medium loads at 1200 to 1500rpm and around 2000rpm.
It's most noticeable at low speeds, especially going up my driveway for example.
On a good day it will run perfectly all day, for hundreds of kms, but if I switch if off and start it again (could be 1 minute or 60 minutes) it might start knocking, or not. I guess on average it will start knocking once every 3 or 4 starts, and once it starts it will keep knocking at low revs.
To stop it, I pull over and restart the motor, and most times it will be OK from then on.
Apart from that, it has plenty of power, does not blow black smoke, no noise at higher revs, and is economical (I think) 12L per 100km towing a 1200kg camper trailer at max speed limits.
I have had the injectors scanned, but apart from a fluctuating No 1 injector which gives me a rough idle, all appears OK. And of course when I got the mechanic to look at it, the engine ran perfectly.
My thinking is it could be a faulty solenoid, sensor or check valve on the common rail, because it is either good or bad, however the knocking sound is quite slow, which makes me think it's just one cylinder, which would point to the No 1 injector? I can put up with the rough idle, but no the knocking.
Has anyone come across a similar problem? I'm tearing what is left of my hair out. Any advice would be much appreciated.
The problem is an intermittent heavy diesel knock when the engine is hot and cold.
Sounds something like a big end knock/rattle, or no oil in the engine, on light to medium loads at 1200 to 1500rpm and around 2000rpm.
It's most noticeable at low speeds, especially going up my driveway for example.
On a good day it will run perfectly all day, for hundreds of kms, but if I switch if off and start it again (could be 1 minute or 60 minutes) it might start knocking, or not. I guess on average it will start knocking once every 3 or 4 starts, and once it starts it will keep knocking at low revs.
To stop it, I pull over and restart the motor, and most times it will be OK from then on.
Apart from that, it has plenty of power, does not blow black smoke, no noise at higher revs, and is economical (I think) 12L per 100km towing a 1200kg camper trailer at max speed limits.
I have had the injectors scanned, but apart from a fluctuating No 1 injector which gives me a rough idle, all appears OK. And of course when I got the mechanic to look at it, the engine ran perfectly.
My thinking is it could be a faulty solenoid, sensor or check valve on the common rail, because it is either good or bad, however the knocking sound is quite slow, which makes me think it's just one cylinder, which would point to the No 1 injector? I can put up with the rough idle, but no the knocking.
Has anyone come across a similar problem? I'm tearing what is left of my hair out. Any advice would be much appreciated.
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