Question about 2002 Chevrolet TrailBlazer
Need schematic and directions for replacing a bad injector
I have Chevy Equinox 2008, I replaced injectors rrecently, I have just some notes:
-Some times you just need to replace injector filter (a small cone)
-Take Care of washer when you plced back the injector put some Engine oil around it
- take Care of lables for Injector wire for the right place if there are no lables put them by your self befor disconnecting injectors
Posted on Oct 15, 2012
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect the powertrain control module (PCM) grounds for being clean, tight, and in the proper locations. Refer to Engine Controls Schematics .
Search for bulletins.
Test the engine coolant temperature (ECT) sensor for being shifted in value. Connect a scan tool. Compare the engine coolant temperature against the intake air temperature (IAT) on a cold engine. The ECT and IAT sensor values should be within ?± 3?°C (5?°F) of each other. If the ECT sensor is out of range with the IAT sensor, check the resistance of the ECT sensor. Refer to Temperature Versus Resistance for resistance specifications. Replace the ECT sensor if the resistance is not within the specification. If the sensor is within the specification, repair the ECT signal circuit for high resistance.
Inspect the mass air flow (MAF) sensor installation. A MAF sensor that is incorrectly installed may cause a hard start. Important: The embossed arrows on the MAF sensor indicate the direction of the intake air flow. The arrows must point toward the engine. Install the MAF in the proper direction. Refer to Mass Airflow Sensor/Intake Air Temperature Sensor Replacement .
Inspect the camshaft position (CMP) sensor for proper mounting and/or a bad connection. A long crank time occurs if the PCM does not receive a CMP signal.
Inspect the fuel pump relay operation. The fuel pump should turn ON for 2 seconds when you turn ON the ignition. Refer to Fuel Pump Electrical Circuit Diagnosis .
A faulty in-tank fuel pump check valve allows the fuel in the lines to drain back to the tank after the engine stops. Refer to Fuel System Diagnosis .
Inspect both injector fuses for being open. An open injector fuse causes four injectors and four ignition coils not to operate. Replace the fuse. Inspect the injector circuits and the ignition coil circuits for an intermittent short to ground.
Inspect for incorrect fuel pressure. Refer to Fuel System Diagnosis .
Inspect for a restricted fuel filter. Refer to Fuel System Diagnosis .
Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
Test both injector fuses for being open. An open injector fuse causes four ignition coils and four injectors not to operate. Replace the fuse. Inspect the ignition coil circuits and the injector circuits for an intermittent short to ground.
Inspect for proper ignition voltage output with J 26792 Spark Tester. Refer to Electronic Ignition (EI) System Diagnosis .
Remove the spark plugs and check for the following:
Correct heat range
Refer to Spark Plug Inspection in Engine Electrical.
Determine the cause of the fouling before replacing the spark plugs if the spark plugs are gas, coolant, or oil fouled. Refer to DTC P0172 or P0175 for diagnosis of the rich condition. Refer to Spark Plug Inspection in Engine Electrical for diagnosis of coolant or oil fouled spark plugs.
Inspect for bare or shorted ignition wires.
Inspect for loose ignition coil grounds. Refer to Electronic Ignition (EI) System Diagnosis .
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Put a long screwdriver directly on the
injector while the car is running. Hold the handle up to your ear. You
should be able to hear a rhythmic clicking sound. If you do, your injector is
good. Hearing a clunk-clunk type noise means you have found your problem. Hearing silence or unusual clicking
patterns means either the injector, wires or plunger may be bad or sticking.
You will either have to clean or replace them.
---------- To know more about fuel injectors and troubleshooting.Please click on the link below:---
Many a times you get black smoke from exhaust due to faulty injectors.Check fuel injectors. Leaking injectors create an overly rich air/fuel mixture and cause black smoke. Take the valve cover off and look at the exhaust part of the injector, when it is running. Each time the injector fires, you should see oil exhausting from it. If you see oil coming out, then the injector is good. When replacing a bad injector, take the glow plug out and crank the engine to get any oil out of the cylinder.----------------- This should help.Thank you.
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