Gunson COLORTUNE G4074 Handbook
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Gunson COLORTUNE G4074 Handbook

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PROFESSIONAL
FAULT CODE READER OBD1 1
COLORTUNE
GASTESTER
EEZIBLEED
PART NO G4074 / G4170 / G4171 / G4172
HANDBOOK

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Summary of Contents for Gunson COLORTUNE G4074

  • Page 1 PROFESSIONAL FAULT CODE READER OBD1 1 COLORTUNE GASTESTER EEZIBLEED PART NO G4074 / G4170 / G4171 / G4172 HANDBOOK...

  • Page 2: Table Of Contents

    COLORTUNE INDEX Page 1. Application Details 2. Colortune Contents 3. General Precautions 4. How Colortune works a. Combustion flame appearance b.The Science c.The practical details 5. Fitting Colortune to the engine 6. Simple engine tests with Colortune 7. Fuel system types 8.

  • Page 3: Application Details

    1. Applications Car and light commercial vehicles (Part No G4074) A thread size of 14 mm has been used for nearly all cars and light vans produced in the last 50 years. One exception is the Ford SOHC Pinto engine (1970's) which was 18mm size (adaptor available) and recently some vehicles have been introduced with smaller sizes due to space restrictions on smaller 16 valve engines.

  • Page 4: Colortune Contents

    2 .Contents The Colortune G4074 1. COLORTUNE plug-14mm size short reach with 16mm (5/8”) hexagonal body size. A hexagon adaptor is provided to adapt to a 13/16” (20.6mm) plug spanner -also suitable for long reach applications. 2. Solid cross section gas seal washer.

  • Page 5: General Precautions

    3. General Precautions. • Testing of vehicles is potentially hazardous.Take every precaution to avoid injury and ensure that you have sufficient understanding of the task being undertaken. Seek advice or follow the guidance of a comprehensive vehicle manual. • Using this product involves working on a car while the engine is running. This is a potential hazard and the user should take every precaution to avoid any possibility of damage or injury.

  • Page 6: How Colortune Works

    4. How Colortune works Understanding the principle by which COLORTUNE works helps in getting the best out of it. That principle is commonly seen in action on paraffin heaters, gas cookers, or anywhere where a fuel is burnt in air to produce heat or energy. Combustion at its most efficient produces a clear blue flame, various other colours result from inefficient mixtures.

  • Page 7: B.the Science

    4.b.The Science • The correctly proportioned mixture is - 14.7 parts of air by weight to 1 part of petrol (hydrocarbon fuel). • If there is perfect combustion, all the fuel will be burnt to produce carbon dioxide and water with no carbon monoxide or unburnt fuel (hydrocarbons).

  • Page 8: Fitting Colortune To The Engine

    5. Fitting Colortune to the engine 1. Before fitting Colortune, start the engine and warm up to normal operating temperatures, preferably by going for a short drive. 2.To assist with flame visibility, park your car in such a way that the engine is in the shade, (or you may use the viewerscope attachment).

  • Page 9: Simple Engine Tests With Colortune

    6. Simple engine tests with Colortune. Idle speed With Colortune installed in a warm engine and the engine running at idle speed, a regular flash of light, with a Bunsen blue flame, should be visible as the mixture is ignited in the cylinder. On systems which have a slow running mixture adjustment, turn the adjustment to explore the range of colour available.
  • Page 10 Full throttle When maximum power is demanded (at full throttle position) it is normal to again have a slightly richer mixture, at most engine speeds there will be a yellow flame. Engines with modern electronic engine management systems which have more precise control would not usually give a yellow flame at full throttle, except at times of rapid acceleration.

  • Page 11: Fuel System Types

    7. Fuel System types The following description of fuel systems is intended purely to identify the various types which may be encountered and to highlight the basic features. While this may be sufficient description for some simple adjustments to be performed, a comprehensive vehicle manual or the General Fuel System Manual should be referred to for further detailed information.
  • Page 12 The slide is attached to a needle running in a jet in a similar way to the variable choke carburet- tor but this does not give a constant depression as the slide position is governed by the throttle position selected at the time, not by a diaphragm. Mixture is governed by the shaped bottom of the slide at lower speeds/light loads, the needle taper and position at mid speeds and the main jet size at all engine speeds when on full throttle.
  • Page 13 control is almost entirely electronic. Fuel injection systems with adjustable idle mixture Single point injection. This system has one injector and one throttle plate through which all air and fuel passes into the engine manifold. Despite this simplicity, the same control systems are required to achieve accu- rate fuel metering.
  • Page 14 tem does not recognize mechanical problems only the effect on electronic items and will show for example a lambda (oxygen) sensor or lambda control system fault in the case of inlet or exhaust manifold air leaks. Multiple, twin and twin choke carburettors. Multiple throttle body injection.

  • Page 15: Engine Fault Finding With Colortune

    8. Engine fault finding with Colortune As Colortune allows you to view the burning of the fuel air mixture, most of the faults observed during its use will be mixture / fuel system related. However, there are other faults which affect efficient combustion and these will also be easier to diagnose.
  • Page 16 ABOVE IDLE SPEED Symptoms Fault details for different fuel systems Yellow Flame at Fixed Choke or carburettor with separate idle circuit - restricted 1000-1700rpm idle air bleed Variable choke - Worn metering needle/jet Yellow Flame Variable choke - Hole in diaphragm. 1200 and above Manifold air leak results in a rich setting to compensate for a weak idle (rich setting then affects whole operating range)

  • Page 17: Warranty

    9.Warranty The Tool Connection Limited has made every effort to ensure that this product is of the highest quality and value to the customer. However, The Tool Connection accepts no responsibility for any consequential loss or damage arising from the use of this product. All technical enquiries regarding this product should be made to The Tool Connection Technical Service Department: ++44 (0) 1926 818181 or returned to:...
  • Page 18 Gunson 05/2005...
  • Page 19 Part of the connection...

This manual is also suitable for:

Colortune g4170Colortune g4171Colortune g4172

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