4 Spark plug replacement Most new engines do not require spark plug replacement for up to (100,000 miles)
5 Normal service and replacement items in a minor tune-up are… Perform a visual inspection for obvious problemsCheck for trouble codes on computer controlled vehiclesReplace spark plugsService the ignition system, including checking secondary componentsReplacing the air and fuel filterChanging oil and lubricating the chassisTesting and servicing emission control system, and resetting the reminder circuitAdjusting the fuel system if applicableCleaning the throttle body and idle air bypass on fuel injected enginesRoad testing before and after tune-up to check engine performance
6 Service and replacement items in a major tune-up are… Perform a scope analysis of engine systemTesting and replacing spark plug wiresTesting and replacing fuel pumpReplacing drive beltsReplacing brake, transmission, and other fluidsReplacing or rebuilding the throttle bodyRebuilding or replacing the distributerAdjusting the valve train (some engines)Replacing weak sensors: oxygen sensor, cam position sensor, crank shaft position sensor, ect
7 Six of the diagnostic tools used during a tune-up are… scan tool, an exhaust gas analyzer, a compression gauge, a multi meter, an oscilloscope, a vacuum gauge, and other tools
8 Some performance factors affected by a tune-up are… Engine power accelerationFuel consumptionExhaust emissionsSmoothness of engine operationEase of startingEngine service life
9 General Tune-Up RulesIt is important to gather engine and vehicle performance info before performing the tune-up because this gives you clues on what you need to investigate or replace.
10 It is important to bring the engine up to full operating temperature prior to diagnosing an operating condition because when the engine is cold you cannot obtain accurate test results.
11 Its important to maintain a vehicles service records because if a problem occurs you can check your record to correct the trouble.
12 Tune-up safety rulesIt is important for the battery to be disconnected before maintenance so it does not accidentally crank the engine or electrical fire.
13 Tune-up safety rules to follow Wear eye protectionSet parking breakPlace vent hose on exhaust pipeDisconnect battery
14 Typical tune-up procedures Battery problems-dirty case top, corroded terminals, and physical damageAir cleaner problems –clogged or contaminated filter, inoperative air flaps or disconnected vacuum hoses.Belt problems- looseness, fraying, and slippage.Low fluid levels- engine oil, brake fluid, power steering fluid, ect.Deteriorated hoses- hardened or softened cooling system, fuel system, and vacuum hoses.Poor electrical connections-loose or corroded connections : frayed, pinched, or burned wiring and terminals.
15 Three important steps in replacing spark-plug wires are… To remove the spark-plug, first check that the spark-plug wires are numbered or located correctly in their clips. Grasping the spark-plug wire boot, pull the wire off the plug. Twist the boot back and forth if it sticks Ignition coils must be numbered before plugs can or located correctly in their clips. grasping the spark-plug wire boot, pull the wire off the plug. Twist the boot back and forth if it sticks. Ignition coils must be removed before plugs can be replaced. Be sure engine is cool before removing spark-plugs. Removing a spark-plug from a warm aluminum head can damage the threads in the spark-plugs holes.
16 Tools used to remove spark-plugs Swivel ratchet, an extension, and a spark – plug socket.
17 The correct colors for the tip and insulator Grayish or brown= properly burningBlack or wet= not firing or engine problem
18 If the spark-plug wire is not put on the right cylinder spark-plug, the plug will not fire.
19 Oxygen sensorsOne and two wires need to be replaced at 50,000-60,000 milesHeated three-wire oxygen sensors should be replaced at about 100,000 miles
20 Recommended procedures for replacing a sensor Disconnect the negative battery cable. then, separate the sensor from the wiring harness by unplugging the connector. Never pull on the wires them selves, as damage may result.
21 Three primary adjustments performance during a tune-up Pick up coil air gap adjustmentIdle speed adjustmentIgnition timing adjustment
22 Diesel engine tune-upDiesel engines require periodic maintenance similar to gasoline engines but don’t have spark plugs to replace or an ignition system.
23 Typical service tasks performed during diesel engine maintenance intervals are Replacing the air filter elementCleaning, draining, or replacing the fuel filtersAdjusting engine idle speedAdjusting accelerator and governor linkageInspecting the engine and related systemsAdjusting valve and injector timingChanging engine oil and oil filterServicing emission control systemsmaintenance intervals are specific periods ( in miles or months ) for component service.