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Installed 2002 5.7 L into 1998 silverado 5.7 L used all 1998 sensors on new motor, injectors included service engine light soon is on and flashing code PO303 changed injectors back to the orgs off the 2002 motor now light is flashing and code PO301 comes up on my obd2 installed new plugs wires cap rotor swaped coils ing mod and cam pos sensor crank pos sensor knock sensor and module im useing org pcm from 1998 motor still cant get rid of the misfire any info would be most app
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P0304 is a diagnostic trouble code (DTC) for a misfire on cylinder 4. This could be caused by a variety of issues, including a faulty spark plug or oxygen sensor. However, a rough idle and a misfire could also be caused by other issues such as a vacuum leak, low fuel pressure, or a malfunctioning fuel injector. It's best to have a professional diagnose the specific cause of the issue.
P0316 FORD - Misfire Detected On Startup First 1000 Revolutions
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Engine fails to start - Engine runs rough
Possible causes
- Crankshaft Position (CKP) sensor harness is open or shorted - Crankshaft Position (CKP) sensor circuit poor electrical connection - Faulty Crankshaft Position (CKP) - Ignition System - Fuel Injectors - Running out of fuel - Fuel Quality
Cauases or fault codes are not cut and dry, but here are the possible causes of codes P0316 and P0306 which are related codes.
P0316 - Engine Misfire Detected on Startup
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Engine fails to start - Engine runs rough
Possible causes
- Crankshaft Position (CKP) sensor harness is open or shorted - Crankshaft Position (CKP) sensor circuit poor electrical connection - Faulty Crankshaft Position (CKP) - Ignition System - Fuel Injectors - Running out of fuel - Fuel Quality - Faulty Engine Control Module (ECM)
P0306 - Cylinder 6 Misfire Detected
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation
Possible causes
- Faulty spark plug 6 - Faulty ignition coil 6 - Ignition coil 6 harness is open or shorted - Ignition coil 6 poor electrical connection - Clogged or faulty fuel injector 6 - Injector 6 harness is open or shorted - Injector 6 poor electrical connection - Improper spark plug 6 - Insufficient cylinder 6 compression - Incorrect fuel pressure - Intake air leak
When a misfire occurs, engine speed will fluctuate. If the engine speed
fluctuates enough to cause the Crankshaft Position (CKP) sensor signal
to vary, The Powertrain Control Module (PCM) or Electronic Control
Module (ECM) can determine that a misfire is occurring.
When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.
Symptoms: - Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation
Possible Causes: - Improper spark plug at cylinder #5 and #6 - Insufficient compression at cylinder #5 and #6 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #5 and #6 - Fuel injector #5 and #6 may be faulty - Intake air leak at cyli
Possible Solution: - Perform Injector Service - Replaced Spark Plug #5 and #6 - Replaced Injector #5 and #6 - Replaced Ignition Coil #5 and #6
Try swapping the injector on that cylinder with the one next to it and see if the misfire changes to the other cylinder.If it does then you have a plugged or bad injector.It it still stays on that same cylinder then check compression on the number 6 cylinder.Let me know what you find out.Good luck.
the flashing light indicates to the driver that the engine is under severe misfire wich could lead to damaging the cat. Have the codes pulled by autozone or advance they do it for free. Then start there but it sounds like it could be your oxygen sensor
When the check engine light flashes, It's not giving out codes. It is telling you that the engine is misfiring on 1 or more cylinders. New plugs and wires might fix your problem.
Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.
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