Tips on how to Diagnose Engine Complications Diagnosing a Rough Running Engine or Cranks But Will not Start1Scan the vehicle along with your OBD-II scanner to examine for any diagnostic codes. Use your repair manual to help you in identifying the codes located by the scanner.2Check the voltage coming from the alternator with all the multimeter, this really should be in between 13 and 14 volts. Low voltage may cause electrical components to fail.3Check the spark plug wires. That you are looking for a disconnected, broken Auto diagnostic tool, cracked or oil-soaked spark plugs. Replace any broken or damaged spark plug wires.4Remove the spark plugs and examine for any fouling (soot or ash on the plug) or damage. Replace any fouled or damaged spark plugs.5Check the spark of the vehicle working with the spark tester connected towards the spark plug wire.
Replace the ignition coil in the event the voltage coming into it really is at 12 volts plus the spark is still weak.6Check the compression in the car employing the compression tester screwed exactly where the spark plug is supposed to go. Evaluate your compression benefits to that in your repair manual. Rebuilding the engine are going to be necessary if the internal compression is low.7Connect the fuel pressure tester for the schrader valve on the fuel rail and test the pressure with the fuel within the technique. Evaluate your fuel pressure reading for the manufacturer specifications listed in your repair manual.8Check the fuel filter and fuel lines for restriction if the fuel pressure is low. If there's no restriction in either of those, replace the fuel pump.9Use the scanners "function" tests to manually operate the electronic controls and verify operation of other sensors. These controls are: Idle air control and Throttle position sensor.
The sensors to verify operation are: Oxygen sensors, Mass air flow sensor and Manifold absolute pressure sensor.10Test the block from the engine for damage working with the block testing kit per the guidelines.Diagnosing an Overheating Engine11Check the degree of the coolant. There will be a high and low mark on the coolant tank.12Check the vehicle for a coolant leak and repair when the coolant level is below the low mark.13Check the temperature distinction among the upper and decrease radiator hoses. If there's a drastic difference, then begin by altering the thermostat.14Open the radiator cap and watch for a steady GM MDI, but slow flow of the coolant. This test will verify operation with the water pump and show if you will find any restrictions in the technique.15Check all hoses for kinks and breakage. Replace them as needed.16Check that there's energy obtaining towards the radiator fans. They may only get power at a specified temperature. Your repair manual will inform you of that specified temperature.17Use the OBD-II scanner to confirm that the coolant sensor is reading the correct temperature if the cooling fans aren't acquiring any power.18Tap the cooling fan motors lightly with a hammer if they may be receiving energy, if they move slightly this verifies that they are in have to have of replacement.
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