I need some help. My truck is at the dealer right now because when it is cold out, below 30 degees, it smokes when started and the colder it is, below 20 out, the more and the longer it smokes white and diesel smell. 2 years ago they replaced the injectors and everything was perfect. Last winter I had the fuel pump and regulator replaced. When picking it up from them the injectors blew the tops off of the left bank. They thought it was the fuel pump and replace it along with all new injectors(thought there might me metal in them from pump). After doing the replacements, while mechanic was test driving, it did it again. Blew white smoke, bad running and quit. Mechanic then found out that the return line on left bank had bottomed out, its on the back of the left head causing no fuel return, the banjo fitting on the outside back corner of the head, and fixed that and put new injectors on left bank. When I got it back it started to puff white smoke when cold but not during the spring summer and fall. We couldn't get it to do it when I would take it back cause it was always too warm. Told to bring it back when it got cold again.
Fast forward to this last week. Took back to dealer cause starting to smoke white and diesel smell when cold, the colder it gets, the longer it smokes and runs rough. All the injector check out ok with tech 2 as did last year. He finally took all the glow plugs out and did a compression check and on the left bank, 2 of the cylinders have 80 lbs lower compression when cold than all the rest. He said that they were still above minimum by 100 lbs.
Now the kicker. When plugged in over night and its cold out, block warm the compression is normal with the rest. Double checked and still the same.
Does any one have any clues as to why the difference on those 2 cylinders show difference compression? Could excessive back pressure on the injectors and blowing the tops off have caused something in the cylinders to cause the lower compression back last year when this started.. When I say it smokes when cold and smokes more and long the colder, say up to 2 minutes when at 18 degrees, and then like someone threw a switch, it quits smoking and runnning rough (I forgot to mention that earlier).
Does anyone have a clue, ideas, thoughts or help. Would really appreciate some help!!!!!!!
Thanks
Fast forward to this last week. Took back to dealer cause starting to smoke white and diesel smell when cold, the colder it gets, the longer it smokes and runs rough. All the injector check out ok with tech 2 as did last year. He finally took all the glow plugs out and did a compression check and on the left bank, 2 of the cylinders have 80 lbs lower compression when cold than all the rest. He said that they were still above minimum by 100 lbs.
Now the kicker. When plugged in over night and its cold out, block warm the compression is normal with the rest. Double checked and still the same.
Does any one have any clues as to why the difference on those 2 cylinders show difference compression? Could excessive back pressure on the injectors and blowing the tops off have caused something in the cylinders to cause the lower compression back last year when this started.. When I say it smokes when cold and smokes more and long the colder, say up to 2 minutes when at 18 degrees, and then like someone threw a switch, it quits smoking and runnning rough (I forgot to mention that earlier).
Does anyone have a clue, ideas, thoughts or help. Would really appreciate some help!!!!!!!
Thanks
