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You have two separate issues here. First, you have what I would think is leaking valve seals. When you slow down, there is a great amount of vacuum build up inside the intake track. With leaking valve seals, this will pull oil past them and down into the intake track. This gets pulled into your engine when you speed back up and causes the blue smoke. ...


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Well after having no luck in trying to resolve the issue myself, we finally took the vehicle in. The technician was able to only get one code after trying to get it to reproduce the issue. Fuel Pressure Sensor fault. We had it replaced, a week latter now and still running strong. The technicians explanation was that the fuel pressure sensor pump starts to ...


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you might need to check the relays in the fuse box, without forgetting the fuel regulator.


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I essentially gave up and took it to a mechanic. The fuel pump was dead. What happened was my fuel pump was dying. It was providing around 5psi of pressure when it needed around 9-14psi. Overall, I had the mechanic replace the pump & regulator and the truck is working normally again. I had some codes on my computer for the EGR system and the MAP sensor. ...


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This is a typical problem for when your glow plugs are wearing out, or not heating as they should. If they are not heating properly, but are still heating, you'll not get an error code. Getting them replaced would be the first thing I'd look at doing.


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My first guess on this would be Glow/Heater plugs or the circuit wiring or relay, but since you say it's not showing on diagnostic checks it would lead me to believe it's a mechanical failure. Have you had a compression test done? That would be my next move.


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I think that something blocking fuel lines, maybe hose bend. After some time under pressure of fuel pump it unblocks and fuel rail pressure returns to normal. Not sure that ECU has fuel pressure sensor, so it is just a theory but it worth to check fuel pressure first


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What if bobber (fuel level sensor) in your fuel tank is squeezing fuel hose when tank is about 100% full? In this case you get fuel pressure drop and lean fuel mixture (that causing missfire). Go to service and aske them to open you tank, remove fuel pump system and investigate it.



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