Expert Minds

Which product should be recommended for removing fuel varnish from a throttle body? (Ans - Aerosol throttle cleaner Counterman A says the heater control valve regulates the flow of coolant through the heater core. Counterman B says all A/C compressors use pistons to pump refrigerant through the A/C system. Who is right? (Ans - Counterman A only A/C condensers: (Ans - Are usually located in front of the radiator; receive high pressure refrigerant gas from the compressor; Cool the refrig...

All the gauges in the instrument panel are inoperative. Technician A says to check the sending units. Technician B says to check the fuse for the instrument panel. Who is right? Technician A only Technician B only Both Technicians A and B Neither Technician A nor B Interface device - ANS) What diagnostic device is shown in the photograph? a. Interface device b. Scan tool c. Laptop computer d. Scope adapterBlue - ANS) The code "BL" on a wiring diagram means what wire color?

A driver says that the front end of his car vibrates up and down while traveling at most road speeds. Tech A says that too much runout of the front wheels could be the cause. Tech B says that a static out of balance of the front wheels could be the cause. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B (Ans - C. Both Techs are right. Too much runout or static out of balance in the front wheels will cause a vibration A vehicle has front wheel shimmy at low ...

When replacing steering or suspension parts, which precaution is needed to be performed? Fasteners tighten to factory specifications Most parts need to be replaced in pair (left and right side) The front wheels should be in the straight-ahead position when the final parts are tightened All of the above (Ans- All of the above A steering dampener looks like a ___________. Bump stop Shock absorber Pulley Straight long steel rod (Ans- shock absorberWear indicator ball joints indicate th...

Deactivating restraint systems requires how long a waiting period before repairs can proceed? A. 60 seconds B. 30 minutes C. 3 hours D. time listed in repair manual (Ans- D. time listed in repair manual 30 minutes is the average time, but this may vary so always consult the service manual. Technician A says that while salvage airbags can be used, new OEM parts are preferred. Technician B says that salvage parts must never be used in the airbag system. Who is right? A, B, Both or Neith...

Which of the following is the correct way to adjust tapered roller bearings? A. Torque and the back off OEM specification B. Torque to OEM specification C. Adjust to a minimum of .150 " (3.80mm) end-play. D. Torque to 50 ft lbs. (Ans- Torque and then back off OEM specification. It is typical to torque the bearing while rotating the wheel and then back off the nut a certain amount. A vehicle has a crooked steering wheel when driving down the road. Technician A says this could be caus...

Technician A says that any imperfection found in a phenolic caliper piston warrants replacement. Technician B says that a phenolic caliper piston should be protected with a block of wood when installing it into the caliper bore with a C-clamp. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B (> - The correct answer is B. A phenolic piston should be protected to keep it from being damaged when a C-clamp is used. Technician A is wrong because m...

When checking the foot valve primary and secondary ports for leakage what is the allowable pressure difference? (Ans- It should not exceed a 5 pounds per square inch difference. At what pressure should the stoplight switch illuminate on air brake systems? (Ans- 6 pounds per square inch or less. When checking the stoplight switch what is the allowable leakage? (Ans- There should be no leakage. When checking the relay valve what is the allowable leakage at the exhaust port of the valve? ...

The compressor is rapidly cycling on and off on a CCOT air conditioning system. Technician A says this condition can be caused by a low refrigerant charge. Technician B says this could be caused by a faulty clutch cycling switch. Who is correct? (Ans- Both technicians are correct. Technician A says while performing a retrofit from R-12 refrigerant to R134a refrigerant, the refrigerant must be recovered into a dedicated cylinder, they cannot be mixed. Technician B says R-12 refrigerant fu...

Which of the following would be the correct tool to bench test a highpressure common-rail injector? A. Digital multi-meter (DMM) B. Test Light C. Fused Jumper wire D. Voltmeter (Ans- A. Digital multi-meter (DMM) (A DMM set on the Ohms scale can be used to measure the resistance of the coil) A diesel engine fails to reach operating temperature. Which of the following is the most likely cause? A. Stuck open thermostat B. Stuck closed thermostat C. Slipping fan drive belt D. Slipping fa...