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returning to shop friday evening started losing power on freeway.made it back to shop and parked over weekend.Mon. mornining went to start. turned key on and noticed absense of buzzing noise .tryed to start several times and only made a little firing noise .has been running rouggh at start up and light blue smoke on acceleration until hot then ran good.at dealer now.thanks for any replies in advance.
Let us know what the dealer found. What year truck? How many miles? Did you try and start it even though no buzzing sound? What did it do at that time? Did you drive it to the dealer or tow it? Was there a diagnostic trouble code on the dash? How did the engine turn over? Was it sluggish or normal? The more information the better.
2005 F550 with IMT service body and crane.turned over normally,no indication on dash.had it towed to dealer.talked to tech at dealer buzzing is injectors heating.went in MON. night. WED. afterrnoon service told me they were having trouble communicating and had to replace injector control module.he also said tech thought it had bad injector and wanted to cold start in morning.