148000 kls recent loss in power , more noticable on takeoff and going up hills around the same time the electronic engine fault light appeared also slightly harder to start also around this time 205/65 tyres fitted not 205/55 as recommended
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I can think of two possibilities.
1) The air mass meter could be defective, or covered in dirt, and not providing the right fuel mix under a load heavier than normal driving.
2) The monolith in the Cat may be breaking up and blocking the exhaust system, which would again be more noticeable under load.
Both possibilities are usually accompanied by reduced acceleration and a drop in performance but when the problem starts these things may not be detectable.
Your catalytic converter sounds like its clogged...When clogged it restricts exhaust and puts excessive back pressure on motor causing loss of power ,especially when engine is under load.(going up hill).ONE WAY TO SEE IF THIS IS THE PROBLEM IS TO LOOK UNDER VEHICLE WHEN PROBLEM OCCURS...tHE EXHAUST PIPE BEFORE THE CATALYTIC CONVERTER WILL BE GLOWING DUE TO RESTRICTION....
i have heard that the new turbo for these trucks was made for a cleaner fuel overseas. our fuel is dirty and clogs them which in turn would make it sluggish on takeoff. try finding a way to clean the carbon out.
sounds like a clogged fuel filter. you need to have the engine pressure checked for leaks, you can rent the pressure checker at autozone, it connects to ur radiator and u pump pressure into the cooling system if u find water leaking around the head u know u have a blown head gasket. if ok then check the cylinder compression should beable to rent this also. it screws into the spark plug holes has a gauge on it. alternator problem w/ the light is probaly you need to tighten the belt.hope this helps!!!