Honda Civic/Acura Integra

from 1994 launch

Repair and operation of the car

Diagnostic of a condition of the motor with use of the measure of vacuum

Unfortunately, there is easily mistaken it to interpret when it resulted from the leituras taken through the measure of vacuum, and therefore, they have to be analysed together with the data obtained during the realization of other proofs of diagnosis.

Reading indications of indicative of measure of vacuum it is necessary to pay the attention not only to an absolute value of a detour of an arrow, but also to the speed of his movement. The majority of measuring instruments of the production of import shows the depth of depression in inches of a column of mercury. At the same time it is necessary to think what all the demands standard supply with themselves for a case of the realization of checks in the null height above the sea level. The increase in a relief in each one 300 m after m it leads a mark of 600 to lessen of leituras of instrument approximately in 25 mm.

The vacuum measure adheres straightly to the entry oil pipeline – not to the case of regulator. The trace that during the realization of check all the hoses remained tied, - otherwise it cannot be considered the well-read instrument fiável.

Before initial measurements, heat the motor up to the temperature of normal work. Support wheels you put that you were antishowing and lift the brake of parking. Transfer transmission to the situation "P", begins the motor and let his work in turns of normal one waste time.

Before the launch of motor attentively they check supporter's blades to existence of slits and other damages. Try not to bring any more near to a krylchatka of a hand and the instrument of measuring. Also avoid to assume a position I fight before the car!

Consider indications of the measure of vacuum. In the depth of middle depression in the oil pipeline of entry of the useful motor it will be quite stable (without the breaks of the enemy lines of the arrow) and to do approximately 432÷560 of mm of mercury. In the next paragraphs the scheme of the interpretation of the taken leituras happens:

1. The low indications stability can be an evidence of holes through the placing between the oil pipeline of entry and a head of cylinders, or between the oil pipeline and the case of a regulator. Also the probability of the violation of the tension of a hose of vacuum, failure (towards the delay) the moment of ignition or violation of the installation of phases of the distribution of gas is not excluded. Check the installation of a corner of an advancement of the ignition through an estroboscópio, then in series exclude any other possible causes, executing the checks enumerated in the present Chapter, alone after him it does sense in order that GRM discovers drive for aims of the check of the fairness of the combination of adjusting etiquettes.
2. If the result of the measurement turns in 76÷203 of mm of mercury. the lowest standards also at the same time if they carry out of fluctuation, violation of the tension of the placing of the oil pipeline of entry near to the entry port, or the bad functioning of an injector of the injection of the fuel can appear the reason of such a detour.
3. Regular detour of an arrow of the instrument of measuring below the stable indication in 51÷102 of mm of mercury. with the high degree of the probability it confirms leaks of valves. Check the pressure of compression in cylinders.

5. Frequent vibration of an arrow of the indicator inside variety in 102 mm of mercury. in the only turns of motor, resulted from the emission of smoke of a tube of leak, speech of the use of the captures of direction of valves. If it begins the arrow vibrating in the increase in turns of the motor, check the existence of signs of leaks of the placing of the oil pipeline of entry and a head of cylinders. The degree of estimate of a spring flash of lightning valvate, valves of repercussion of the existence of aspects of a progar and attempt of revealing admissions of the ignition.

7. In the presence of fluctuations of an arrow of the instrument of measuring in the spacious variation they check the pressure of compression or execute the test of holes for ends of identification of the incorrect cylinder or violation of the tension of the placing of a head of cylinders.
8. If the arrow of the instrument of measuring in spite of the fact that a slow speed to "walk" in the spacious variation of a scale, checks passability of the system PCV and the composition of the mixture of wasting time, also one secures of the lack of holes through the placing of the carburator / case of a regulator and the oil pipeline of entry.
9. Appreciate the speed of the return of indications of the measure of vacuum to a reference value when size is closing a valve of butterfly after the rise to the frequency of the rotation of the motor up to approximately 2.500 revolutions per minute at the expense of a bystry priotkryvaniye of the door. The indication in the beginning will reduce practically to the zero, soon to increase on the valuable characteristic of normal turns of wasting time approximately in 130 mm of mercury. and again to return to the indication of the only turns. If the depth of the depression is restored slowly and does not form the very launch in the moment of the sharp close of a valve of butterfly, it is necessary to check if the piston rings are used. In a long delay of the return of passability of check of indications of the system of the production of the carried out gases (the scarf or the catalytic converter very often are blockaded) – he is only the most simple desconectar to section suspected the system of the launch and to repeat the check.