Infiniti QX4 service since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
3.1. Schedule of routine maintenance
3.2. Specifications
3.3. General information about settings and adjustments
3.4. Check of levels of liquids
3.5. Check of a condition of tires and pressure of their rating, rotation of wheels
3.6. Replacement of impellent oil and oil filter
3.7. Check of a condition and replacement of the hoses located in an impellent compartment
3.8. Service of system of cooling (oporozhneniye, washing and filling)
3.9. Check, service and charging of the storage battery
3.10. Check of a condition and belts of a drive of auxiliary units
3.11. Replacement of spark plugs, check of a condition of VV of electroconducting
3.12. Replacement of a filtering element of an air purifier
3.13. Check of a condition and replacement of brushes of screen wipers, pro-cleaning and adjustment snuffled supply of washing liquid
3.14. Survey of components of a suspension bracket and steering drive, check of a condition of protective covers of power shafts
3.15. Check of brake system
3.16. Check / adjustment of installations of turns of an idling / corner of an advancing of ignition / quality of an air and fuel mix
3.17. Electric equipment check
3.18. Check of serviceability of functioning and service of systems of heating and air conditioning
3.19. Greasing of locks, loops and emphasis
4. Engine
5. Cooling and heating systems
6. Power supply systems and managements
7. Start and charge systems
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment



3.11. Replacement of spark plugs, check of a condition of VV of electroconducting

The spark plug consists of the central electrode, an insulator with the case and an electrode (ов) masses. Between the central electrode and an electrode of weight the spark igniting an air and fuel mix slips. It is not necessary to apply spark plugs, distinct from the recommended. The recommended type of candles is defined among other things by kalilny number.

Kalilnoye number characterizes degree of thermal loading of a candle. The kalilny number of a candle is lower, the degree of its thermal loading is higher. Thus the candle takes away heat thanks to what possibility of kalilny ignition of a fuel mix is excluded better. The candle with the high thermal characteristic has that shortcoming that its temperature of self-cleaning lies above. It is more inclined to formation of a deposit, in particular when the engine in operating time often does not reach the working temperature, for example movement in the city, short movings in the winter.

The correct kalilny number of a candle is defined by the manufacturer of the car. There are candles with one or several electrodes of weight, with various length of a carving and its diameter. At replacement of a candle it is necessary to establish only the candles corresponding to instructions of the manufacturer of the car.

Average service life of a candle is various. Thus the serious role is played also by a material of electrodes. Chrome - a nickel alloy is characterized by very high heat conductivity and resistance to impact of corrosion. The best heat-removing properties silver whereas platinum electrodes differ high anticorrosive properties and firmness against an obgoraniye possesses. Service life of candles makes from 20 000 to 100 000 km of run, depending on a material of electrodes and their quantity.

Depending on a design of the engine of a candle distinguish as landing consolidation in a head of cylinders.

At flat landing the sealing ring which is usually fixed on the case of a candle is used and to removal is not subject. Candles of konusny landing in application of additional sealing elements do not need and differ in more compact sizes.

Service life of spark plugs with the covered layer of platinum the central electrode much above than at candles of other types.

By correctness of functioning of spark plugs efficiency of return of the engine considerably is defined. It is important, that on the engine candles of the corresponding type (on the Infiniti QX4 models candles with platinum electrodes are regularly established) were established.

Need for unplanned service of spark plugs arises extremely seldom provided that actually the engine is in good repair. In order to avoid casual damage of electrodes, it is not necessary to make cleaning of candles without use of the special equipment.

In most cases for replacement of spark plugs existence of a special candle head (with the elastic loose leaf inside) complete with a ratchet drive is necessary, and also a set for a safe detachment of tips of VV of wires from shafts of spark plugs the special tool though its application and is not strictly obligatory also is issued. Use of a dinamometrichesky key will allow to achieve the correct effort of a tightening of candles.

Before turning out candles their adjusting niches it is necessary to blow the compressed air for the purpose of prevention of hit of garbage in cylinders — it is simplest to use the ordinary bicycle pump).

Check of a condition of candles gives good idea of an engine condition. If on an insulator of the central electrode completely there are no traces of any deposits, it says about repauperization of an air and fuel mix, or that excessively "hot" candle (heat removal from an insulator to the case on "hot" candles is used occurs much less intensively, than on "cold").

Presence on electrodes of a black deposit testifies to mix reenrichment and if the deposit thus still has an oily consistence, it is necessary to think also of more detailed assessment of degree of wear of internal components of the engine.

The raid of a golden or gray-brown shade on an insulator confirms serviceability of a condition of the engine and correctness of configuration of an air and fuel mix.

Verify the turned-out candle with the card of conditions that will allow to estimate the general condition of the engine qualitatively.

Card of conditions of spark plugs

Typical damages of spark plugs

Coal deposits

Symptoms: Availability of soot indicates reenrichment of a fuel and air mix or weak intensity of a spark. Causes ignition admissions, complicates start and results in instability of operation of the engine.
Recommendations: Check, whether the air purifier is hammered, whether fuel level in the poplavkovy chamber is not too high, whether the air zaslonka is jammed and whether contacts are not too worn-out. Try to use candles with longer insulator that increases resilience to pollution.


Symptoms: Zamaslivaniye of a candle is called by wear of maslootrazhatelny caps. Oil gets to the combustion chamber through worn-out directing valves or piston rings. Causes ignition admissions, complicates start and results in instability of operation of the engine.
Recommendations: Make mechanical restore


Symptoms: Porous, white insulator, erosion of electrodes and absence of any deposits. Leads to reduction of service life of a candle.
Recommendations: Whether check there corresponds to requirements of Specifications kalilny number of the established candles, whether the corner of an advancing of ignition is correctly exposed, whether too poor fuel and air mix moves, whether there are no leakages of vacuum of the inlet pipeline and whether valves are jammed. Check as level of a cooler and whether the radiator is corked.

Too early ignition

Symptoms: Electrodes are melted off. The insulator has white color, but can be and is polluted owing to ignition or hit admissions in chambers of combustion of extraneous particles. Can lead to an engine exit out of operation.
Recommendations: Check kalilny number of the established candles, a corner of an advancing of ignition, quality of a mix (whether it is not too grown poor), whether the system of cooling is corked and whether the greasing system normally functions.

Electrocarrying-out luster

Symptoms: The insulator has yellowish color and the polished appearance. Speaks about sudden temperature increase in combustion chambers at sharp acceleration. Usual deposits are thus melted off, taking a form of a varnish covering. Leads to ignition admissions at high speeds of movement.
Recommendations: Replace candles (colder, at preservation of a manner of driving).

Short circuit of electrodes

Symptoms: A waste of products of combustion gets to interelectrode space. Firm deposits accumulate, forming a crossing point between electrodes. Leads to ignition refusal in the cylinder.
Recommendations: Remove deposits from interelectrode space.

Normal state of a candle

Symptoms: Gray-brown color and easy wear of electrodes. Kalilnoye number of candles corresponds to type of the engine and its general condition.
Recommendations: At replacement of candles establish candles of the same type.


Symptoms: Soft brownish color of adjournment on one or both electrodes of a candle. A source of their education are applied additives to oil and/or fuel. Excessive accumulation can lead to isolation of electrodes and cause admissions of ignition and unstable operation of the engine at acceleration.
Recommendations: At fast accumulation of deposits change maslootrazhatelny caps that will prevent oil hit in combustion chambers. Try to replace fuel brand.


Symptoms: A rounding off of electrodes with a small congestion of deposits on the working end. Color normal. Leads to difficulty of start of the engine in cold damp weather and to fuel consumption increase.
Recommendations: Change candles on new, the same type.


Symptoms: Insulators can appear chopped off or burst. Also inaccurate equipment of adjustment of a candle gap can lead to damage of an insulator. Can lead to damage of pistons.


Symptoms: After ignition admissions during a long period of adjournment can be loosened at preservation of working temperature in the combustion chamber. At high speeds of adjournment in flakes come off the piston and stick to a hot insulator, causing ignition admissions.
Recommendations: Replace candles or smooth out and establish into place the old.

Mechanical damages

Symptoms: Can be caused by hit of extraneous materials in the chamber of combustion or arise at piston blow about too long candle. Lead to refusal of functioning of the cylinder and to piston damage.
Recommendations: Remove from the engine extraneous particles and/or replace.

In candles with one lateral electrode into the forefront there is a factor of correctness of installation of the interelectrode gap by which size intensity of an iskroobrazovaniye and, as a result, correctness of ignition of a mix and development of process of its combustion in all modes of operation of the engine is defined. Installation of interelectrode gaps should be made according to instructions of manufacturers of candles.

Originators of the real Management are solidary with manufacturers of Infiniti and do not recommend to make attempt of restoration of regularly established candles with platinum electrodes by cleaning of the last and correction of an interelectrode gap.

Measurement of size of an interelectrode gap on candles of adjustable type is made by means of special щупа wire type.

At adjustment it is necessary to turn in only a lateral electrode — attempts of deformation of the central electrode are fraught with irreversible damage of an insulator. The nozzle for correction of provision of an electrode usually enters into a set щупа.

If to measurement of a candle gap it is applied usual щуп lezviyny type, it is possible to consider a gap adjusted correctly when an edge (I) щупа pass in it with easy resistance.


  1. Before installation of a candle make sure that the carving tip (shaft) is densely screwed, and a carving on the case and an external surface of a candle are well cleaned.
  1. Manually acquire one of new candles in the corresponding opening in the engine. Having made sure that the candle is not warped in a carving, tighten it with demanded effort (in the presence of near at hand dinamometrichesky key). For simplification of procedure of a nazhivleniye of a candle pull on its shaft a piece of a flexible fuel hose — the probability of failure of a carving as at the slightest zakusyvaniye the hose will start to be turned simply is thus excluded. Operating in a similar manner, establish all remained candles.
  1. Before connecting to spark plugs of VV of a wire, execute procedures of service of the last (see below).
  2. Connection to a candle of VV of a wire is carried out by rotary progress of its tip — the last should sit down on a candle shaft (pay attention to marking of wires) densely.

Check of a condition of candle wires

Check of a condition of VV of electroconducting should be made regardless of that, replacement of spark plugs was made, or not.


  1. Check begins with external survey of isolation of wires at the working engine. Tire out the car in a dark room, start the engine and make sure of lack of an iskroobrazovaniye on wires. Iskroobrazovaniye is a sign of breakdown of isolation. Try not to touch moving components in an impellent compartment. Make necessary marks on replacement of defective wires, then let's to the engine cool down.
  2. Check of candle wires is made serially in order to avoid violation of an order of their connection at assembly. Usually on isolation of firm wires there is the corresponding marking. In case of absence that, put it independently by means of an adhesive tape and a marker.
  1. Disconnect VV a wire from a spark plug (best of all use the special tool). At all do not pull for a wire, only for its tip.
  1. Attentively examine internal walls of a tip. Corrosion is usually shown in the form of a fragile korkoobrazny raid of white color.
  2. Pull a tip back on a shaft of the candle, make sure of density of its landing. In case of need again remove a tip and turn in plugs in a rubber cover.
  3. Pure rags wipe a wire on all its length, having completely removed from an isolation surface dirt and greasing traces. Examine wire isolation on existence of cracks, traces прогара and other damages. Try not to bend a wire under acute angles in order to avoid violation of integrity of veins of the conductor in isolation.
  4. Check a condition of contacts of wires from the ignition distributor — again pull only for a tip.

Replacement of VV of electroconducting should be made a set, even in case of failure only one of wires.

Even at an excellent condition of system of ignition, at for start-up in crude weather there can be failures — in case of need spray system elements vlagopogloshchayushchy spray — ask in shops of automobile accessories.

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3.10. Check of a condition and belts of a drive of auxiliary units
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3.12. Replacement of a filtering element of an air purifier