Nissan Patrol, Ford Maverick

1988-1997 of release

Repair and car operation



Nissan Patrol and Ford Maverik
+ Cars of the Nissan Patrol and Ford Maverick series
+ Diagnostics of malfunctions
+ Settings and routine maintenance
+ Engine
+ Systems of cooling, heating and air conditioning
+ the Power supply system and production of the fulfilled gases
- Systems of decrease in toxicity of the fulfilled gases
   System of ventilation of a case
   System of a retsirkulyatsiya of the fulfilled gases (EGR) - models of 3.0 l
   Control system of quality of a mix during a deseleratsiya
   Control system in temperature of soaked-up air
   System of catching of fuel evaporations (ECS)
+ Systems of electric equipment of the engine
+ Transmission
+ Coupling
+ Brake system
+ Forward and back bridges, running gear and steering
+ Body
+ Onboard electric equipment




Control system of quality of a mix during a deseleratsiya

For performance described below diagnostic procedures the manual vacuum pump with the vacuum gage is required.

Action principle

Deep depression in the inlet pipeline at a sbrasyvaniye of turns of the engine (deseleratsiya) leads to emission in the atmosphere not burned down in combustible gases and oil, to increase of issue of hydrocarbonic connections. For the purpose of decrease in level of issue of hydrocarbonic connections the carburetor is equipped with the device of pauperization of a mix at a deseleratsiya (BCDD) (see an accompanying illustration).

On reaching depth of depression in the inlet pipeline of a certain value the valve of management of BCDD opens perepuskny the air channel therefore the volume of the fuel injected into the carburetor through a cast jet is reduced. Completeness of combustion of a mix that conducts to reduction of issue of hydrocarbonic connections thus raises.

In order to avoid an engine detonation after a final stop, model with RKPP are equipped with the electromagnetic BCDD valve which blocks operation of the valve of management of BCDD.

Check of the valve of management of BCDD

In usual conditions the valve of management of BCDD does not need checks and adjustments, however if need for adjustment nevertheless arises, act as it is described below.


 PERFORMANCE ORDER

  1. On models from RKPP disunite the electric socket of the carburetor.

Rassoyedineniye of the socket of the carburetor disconnects electromagnetic BCDD valves and fuel interruptions of supply (locking), preventing their operation in view of what during performance of this check the engine can not hold single turns.

  1. Completely weaken a damper of fast idling (if that is provided).
  2. Remove the top cover of an air purifier and connect the vacuum gage to the inlet pipeline.
  3. Lift engine turns to value 3 000 ÷ 4 000 in a minute, then release a gas pedal. At an otpuskaniye of gas frequency of the sound published by a mouth of the carburetor should change. Such change of frequency indicates operation of the valve of management of BCDD.
  4. Repeat verification of the last paragraph, watching vacuum gage indications during change of frequency of sounding. On models of 4.2 l the device should register depth of depression of 570 ± 50 mm of mercury., on models of 3.0 l - 580 ± 50 mm of mercury.
  5. If change of frequency of sounding does not occur, or depth of depression exceeds nominal rate, remove from the valve of management of BCDD a rubber stopper and turn the adjusting screw clockwise. If frequency on the former does not change, remove the BCDD valve from the carburetor and make sure of operation of its plunzher when giving depression. In case of need replace the BCDD valve.

Do not press the adjusting screw!

  1. If change of frequency occurs at depth of depression below nominal, remove a stopper and turn the adjusting screw counter-clockwise, achieving demanded result.
  2. Execute adjustment of a damper of fast idling.

Check of the electromagnetic valve of management of BCDD

 PERFORMANCE ORDER

  1. Disunite the electric socket of the carburetor.
  2. Submit tension of the battery on electromagnet plugs in the carburetor socket (see an accompanying illustration).
1 — 4,2 l
2 — 3,0 l
  1. Click of operation of the electromagnetic valve in the carburetor should be distributed. Otherwise replace the valve.







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