Not like stop and go in traffic or coasting down mountain passes. Synthetic definitely better but my wife read manual of car and followed that. To me, idle time is letting the truck warm up or cool down for a period of time, uninterrupted. Interestingly we choose 4K OCI with conventional oil in wife's old car. This leads many to erroneously believe that liquid cooled housings have eliminated the coking issue.Īs always, the best thing you can do for a turbocharged engine is to choose a quality synthetic oil of sufficient viscosity and change it regularly. YOU COULD BE HAVING ENGINE MISFIRE.DUE TO BAD SPARK PLUGS AND WIRES.ALSO DIRTY FUEL INJECTORS WILL CAUSE ENGINE TO ROUGH IDLE OR IDLE UP AND DOWN.PUT A BOTTLE OF FUEL INJECTOR CLEAN IN A FULL TANK OF GAS.ALSO CHANGE PLUGS AND WIRES.IF TRUCK HAS 30000 TO 60000 MILES ON IT. This has NOTHING to do with the liquid cooled housing. If the block heater has been plugged in for a few hrs, the engine will initially idle at about 650 RPM and increase to high idle after about two minutes. ![]() Is this to prevent coking ?ġ) Modern, liquid cooled turbochargers still coke up.Ģ) A high quality synthetic oil significantly reduces/eliminates coking.ģ) A modern turbo that has some coking will still perform perfectly, they are quite tolerant by design.Ĥ) The turbine wheel gets hot, transfers heat to the shaft, which is lubricated by engine oil, which can then fry. It the engine is started at OATs of about 20F or below and without the benefit of a block heater, the idle will increase to 1000 RPM shortly after startup. ![]() The manual says that after sustained high speeds, as in just getting off the freeway that you should idle the engine for about 30 seconds before shutting it down or it may damage the turbocharger. Clicking this will make more experts see the question and we will remind you when it gets answered.
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