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Help diagnosing white smoke, rough idle, loss of power
2001 F350 7.3 dually automatic 4X4
I coud use some help diagnosing my truck. It blows white smoke out the tailpipe upon start up. Once it warms us it seems to go away. It burns oil, about a quart every 1,000 miles or so. It idles rough and I have noticed a loss of power and drop in mileage.
I've had two shops look at it and have gotten conflicting diagnoses from both. One said the #2 cylinder was bad - failed compression test (it was around 200 lbs. while all others were in the >300 lbs. range). I had another tell me the #2 injector was bad and the ICP sensor was bad.
They want $1K to replace the injector, $2200 to replace all four on that side. I don't want to (can't) put that kind of money into the truck if the rings and/or valves are bad. I've asked them if they could help diagnose it further, i.e. check to see if the rings and/or valves are bad. They don't want to. Just want to replace the injector(s) and the ICP and "go from there". If the rings are bad I will probably just park it for a better financial day and then put in a short or long block.
I think I'm going to have to take over diagnosing myself from here. I don't have the Enginuity software so it was probably worth it for them to diagnose the injector/ICP.
How would you recommend I proceed? My thoughts were to do a compression test. However, if it turns out to be bad how do I know if it's the rings or the valves? I realize a leak down test is used to diagnose the valves (I believe) but I have no idea how to do one and don't know if I have the tools/equipment to do it. Any advise would be greatly appreciated. Thanks.