Completed service on 3.2 diesel, running okay, after about 100km, started to miss on over and full throttle, took filter off and replaced with new one, test run okay, about 10 km later started to surge and not able to get full throttle. Is okay on idle and just above idle but any revs above that it appears that it is starving for fuel.
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Half throttle or less?Then the demands for full throttle are missing,How is the air filter?Check the air filter it may be plugged.And at more open throttle you need more fuel. You may want to service the fuel filter,At full open throttle the vehicle needs to breath and it also needs to exhale.These two component are just the start for a function inspection If these two serviceable componenet are met,and you still have this problem we can move from this and remedy the situation form a plugged exhaust to a TPS having a bad swipe.Also try a airflow sensor cleaning with the MAF (Mass air flow)
check the O2 sensors in the exhaust manifold with a automotive meter not a code reader ,then trade it in for a diesel manual version as these are impressive but 4.7 litre gas guzler at our petrol prices about 10 dollars a gallon in the -uk and around 7/8 dollars here in spain this vehicle you couldnt give away here
hi have you checked the air filter is it dirty , drain the fuel filter , sounds like the timing is out , the fuel pump timing could be one tooth out , all above is a cheap check before starting any where else .
Do you have the shop manual? You need verify the workings of each part and system one at a time. Follow the working line. You stated you checked the fuel pressure. Where was it checked? At which location? Was it checked under throttle? Does the fuel regulator check out? Is the fuel good (any water)? These problems can sometimes be a bear to find. It takes time and patience. Do one thing at a time and verify that it works properly before moving on to the next part/attack plan. Check all ground conections from the block/engine to the frame/body. Once you verify that the fuel delivery is good, start looking at emission related parts and fuel management parts (TPS, MAF, Cold start injector, EGR, etc.)
Not for the home mechanic, but you could try a fuel system service. Basically they add chemicals to your fuel tank via a machine, and these chemicals clean the fuel system... fuel injectors, lines, filter, basically everything... that seemed to help my fuel mileage and also throttle response.
I have a feeling you got a wholed of unleaded fuel or bad fuel
I drive a diesel box truck the station I always took it to the fuelman put unleaded in the diesal tanks and the truck just died it had to have the gas tank completed drained and cleaned out but also ask yourself how many miles are on it and when was last tune up and if you live in a cold climate I recommend a heater block plug