1. The purpose of running this injector balance test is to determine which injector is restricted, inoperative, or delivering fuel differently than the other injectors. Replacing a complete set of injectors can be expensive. a. Describe the step involve in conducting injector balance test. b. Based on the recorded data on the power balance test in Table 1. Explain the condition on each injector. Table 1 Data collected from power balance test. Injector 123 Initial pressure (psi) 45 45 45 Second pressure 32 36 25 (psi)

Unit pump injection system is an integrated fuel injection system, combining a fuel injector and a high pressure fuel pump in a single unit. O True False

gasoline volatility is being discussed. technician A says gasoline blended for summer use is more volatile than winter gasoline. technician B says in high altitude areas, fuel must be blended to have higher volatility.

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1- What is “valve overlap” and how it's affect the performance of the engine

Q 152. quick tests to a GM hot film mass airflow meter on an engine with idling problems are being performed. technician A taps on the meter lightly with a plastic mallet. technician B unplug the meter. who is correct?

Coolant condition can be tested with all the following tools EXCEPT: Select one: a. Hydrometer b. Barometer c. Refractometer d. Electronic tester

Which of the following statements regarding the “Pre-Emission Inspection Check” Of a diesel powered vehicle that is subject to Opacity (Smoke Meter) testing is not true? The governor (if equipped), the exhaust system, and the emissions control devices must all be checked.   The exhaust system must be checked for any missing sections which would prevent collection of a valid exhaust sample.   Vehicles not meeting requirements cannot be inspected. This is not considered an inspection or rejection and no fee is to be charged.   The governor, if originally equipped, must be checked for presence, connection, and operation.

An O-ring at the base of a fuel injector ______.   provides thermal insulation to allow the formation of vapor bubbles   increases potentially damaging vibrations   dampens vibrations and seals the injector of vacuum leaks   seals the injector to its upper mounting position

Answer and give correct reason. I will rate accordingly.