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Cold Issues in 5th
Ok, I have search high and low to find someone with the same issue I am having with no luck. I have a 05 250 6.0 PSD that is VERY cold natured. If the temp outside is below 40 I plug it up to shorten the symtoms. I am running 5W40 Rotella full syn oil with a recent oil and filters change (about 1,000 miles ago).
On to the issue. When I start it the engine seems to hunt with some missing. Once it gets to the high idle stage of the warm up it seems to smooth out. I then begin to drive it. I have a pretty long hill to pull from the start as I am going up this hill the engine still seems to hunt with high and low surges. Not very hard surges but noticable. Keep in mind the exhaust temps are to operating range but, the engine is still not there at this point (10 minute warm up at around 30 degrees with block heater on all night).
Once I make the hill and the truck shifts into overdrive the truck seems to miss. I have had several people ride with me and all seem to have adifferent opinion of what the truck is doing. This feels like the engine is missing, the transmission is sipping or the turbo is cutting out. All these would describe the condition. If I give it more throttle it just gets worse and if I keep throttling it becomes violent. I can drop completely off the throttle and get into it again (making it down shift) and the problem goes away unitl it shifts back into overdrive. It will do this until the engine begins to warm up. Any thoughts????