Engine Tune-Up Chapter 47

Engine Tune-Up A modern tune-up is performed as a part of routine maintenance instead of a drive-ability problem. People used to wait until the vehicle ran poorly to do a tune up  When modern vehicles run poorly, it’s usually a sensor or computer related problem and seldom will a tune-up repair the it!

Engine Tune-Up - Spark Plugs Some vehicle do not schedule a spark plug replacement until 100,000 miles!

Engine Tune-Up - Minor Tune Service and replacement items in a minor tune up include: 1 2 3 4 5 6

Engine Tune-Up - Major Tune Service and replacement items in a major tune up include: 1 2 3 4 5 6

Engine Tune-Up - Diagnostic tools Diagnostic tools used during a major tune up include: 1 2 3 4 5 6

Engine Tune-Up - Performance factors Performance factors affected by a tune up include: 1 2 3 4 5 6

Engine Tune-Up - Rough Idle Both Techs are ASE Certified Master Technicians Technician at the right says a tune-up will not correct a rough idle in most cases. When modern vehicles run poorly, it’s usually a sensor or computer related problem and seldom will a tune-up repair the it! Technician at the left says the rough idle is most likely due to a defective or malfunctioning sensor, actuator, or ECM.

Engine Tune-Up - Information It important to gather engine and vehicle performance information before performing the tune-up

Engine Tune-Up - Temperature It important to bring the engine up to full operating temperature prior to diagnosing an operating condition

Engine Tune-Up - Service Records It is important to maintain a vehicle’s service records

Engine Tune-Up - Safety Rules OBD II automobiles require the battery be disconnected when performing vehicle service and maintenance.

Engine Tune-Up - Safety Rules Four (4) safety rules to follow when performing a tune-up: 1 2 3 4

Engine Tune-Up - Procedures Vehicle inspections performed during any tune-up:

Engine Tune-Up - Procedures Steps in replacing spark plug wires: 1 2 3

Engine Tune-Up - Procedures When replacing spark plugs in an aluminum engine the engine should be warm

Engine Tune-Up - Procedures Tools used to remove and replace spark plugs:

Engine Tune-Up - Procedures Color observed on a spark plug removed from an efficiently operating engine

Engine Tune-Up - Procedures Steps that must be performed before installing a spark plug in an engine

Engine Tune-Up - Procedures Spark plugs must be installed first , ______ ______ before ???????????

Engine Tune-Up - Procedures When installing spark plugs equipped with metal sealing washers the spark plug should be threaded in until it bottoms, then tightened an additional _____ turn.

Engine Tune-Up - Procedures Spark plug wires that are not put on the correct cylinder’s spark plug cause the engine to misfire, run poorly, or not run at all (backfires when trying to start).

Engine Tune-Up - Procedures The suggested replacement interval for one- and two-wire O2 sensors, For three wire sensors

Engine Tune-Up - Procedures The recommended procedure for replacing an O2 sensor

Engine Tune-Up - Procedures A compression test is performed during an engine’s life to check the engine’s mechanical condition without disassembly.

Engine Tune-Up - Procedures Three (3) primary adjustments performed during a tune-up:

Engine Tune-Up - Diesel Tune-Up Diesel engines require periodic maintenance similar to gasoline engines, but don’t have spark plugs to replace or an oxygen sensor to fail.

Engine Tune-Up - Diesel Tune-Up The typical service tasks performed during diesel engine maintenance intervals include:

Engine Tune-Up - Diesel Tune-Up Describe/Define a maintenance interval:

Engine Tune-Up Questions? Refer to the Tune-up chapter (47) in your textbook. Make sure your name, date, and period are on your assignment before you turn it in .