Engine Tune-Up - PowerPoint PPT Presentation

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Engine Tune-Up

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Engine Tune-Up By Jonathan Rollins ... Grasping the spark-plug wire boot, ... separate the sensor from the wiring harness by unplugging the connector. – PowerPoint PPT presentation

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Title: Engine Tune-Up


1
Engine Tune-Up
By Jonathan Rollins
2
  • Tune Up Procedures are done as part of a
    routine maintenance rather than to correct a
    drivability problem.

3
Wear safety glasses!
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 problems
  • Check for trouble codes on computer controlled
    vehicles
  • Replace spark plugs
  • Service the ignition system, including checking
    secondary components
  • Replacing the air and fuel filter
  • Changing oil and lubricating the chassis
  • Testing and servicing emission control system,
    and resetting the reminder circuit
  • Adjusting the fuel system if applicable
  • Cleaning the throttle body and idle air bypass on
    fuel injected engines
  • Road 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 system
  • Testing and replacing spark plug wires
  • Testing and replacing fuel pump
  • Replacing drive belts
  • Replacing brake, transmission, and other fluids
  • Replacing or rebuilding the throttle body
  • Rebuilding or replacing the distributer
  • Adjusting 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 acceleration
  • Fuel consumption
  • Exhaust emissions
  • Smoothness of engine operation
  • Ease of starting
  • Engine service life

9
General Tune-Up Rules
  • It 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 rules
  • It 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 protection
  • Set parking break
  • Place vent hose on exhaust pipe
  • Disconnect battery

14
Typical tune-up procedures
  • Battery problems-dirty case top, corroded
    terminals, and physical damage
  • Air 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 burning
  • Black 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 sensors
  • One and two wires need to be replaced at
    50,000-60,000 miles
  • Heated 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 adjustment
  • Idle speed adjustment
  • Ignition timing adjustment

22
Diesel engine tune-up
  • Diesel engines require periodic maintenance
    similar to gasoline engines but dont have spark
    plugs to replace or an ignition system.

23
Typical service tasks performed during diesel
engine maintenance intervals are
  • Replacing the air filter element
  • Cleaning, draining, or replacing the fuel filters
  • Adjusting engine idle speed
  • Adjusting accelerator and governor linkage
  • Inspecting the engine and related systems
  • Adjusting valve and injector timing
  • Changing engine oil and oil filter
  • Servicing emission control systems
  • maintenance intervals are specific periods ( in
    miles or months ) for component service.
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