There is no such thing as a "tune-up" on cars and light trucks manufactured within the last 30 years.
Definition of the word "tune" is "to adjust for peak performance."
There is NOTHING that can be adjusted on EFI engines. It is all in the computer. Pre-adjusted by the folks that programmed the computer.
What WAS a tune up? Replace points, plugs, and condenser. Replace wires if necessary. Then, adjust dwell and timing to specs. Carburetor to be adjusted for fast idle, curb idle, and idle mixture. Choke linkage cleaned and lubricated. Choke operation checked for closing when cold and opening as the engine warms up. Vacuum lines to be inspected and replaced as necessary.
Now, how much of this is left? Carburetor and choke are long gone. Points, condenser, and even the distributor are gone as well. Replaced by sensors and programming. Still spark plugs and a few vacuum lines, but not much more. Adjustments are long gone. Can't adjust timing, dwell, or idle speed.
I repeat. There is no such thing as a tune up on cars 30 years old or less.
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