by Talktheroo on Thu, 10 Mar 2016 9:10 +0000
This is just a general comment about exhaust modifications.
Most of the Toyota designed diesel engines rely on back pressure of some kind.
The 1251 fault code is not one to be to worried about, and the restrictor plate, if you have one fitted, has nothing to do with this fault code.
The code that you will get if there is a problem with the restrictor plate is a P0400 fault code. This normally happens to plates that are smaller than the 7mm hole.
You do get more boost with this plate fitted as there are more exhaust gases passing through the turbine, mainly in low rpms.
With the Toyota electronic system (ECM and sensors) it's pretty good and reliable.
If there is something wrong you can usually see it through the DLC or the readings when you are doing a diagnostic test on the vehicle. MAF sensor error would throw a P0100 or related fault code. If it's the SCV, it will show up as a high out of specification reading. An example, above 2000mAs and the common rail pressure will be jumping around as well.
If you have a problem with the nozzle vane position sensor, it will throw a fault code P2563 or related code.
P0046 for a DC motor problem, or related.
Physical mechanical signs of problems with the turbo are oil leaks or not normal noises coming from warn bushes.
So, before you go ahead and spend a small fortune on a problem, it might be a good idea to get a diagnostic done.
Some companies that I deal with for turbo problems and supply.
Turbo Australia, Brisbane. GCG, Sydney. I do believe BDG sell them, as well. So get onto Matt and see what he can do for you.
Always replace your gaskets with new ones when replacing a turbo assembly. I like to use the genuine Toyota gaskets.
It's fairly uncommon for Toyota turbos to cause problems on the 1KDs. Usually it's a modification not done right, or a service problem where the engine oil has not be changed out, at least on the service book schedule. Every one has a different experience and I except that. This is my experience.
The Roo.
Passing through country and seeing country are two different things.