I have a 2003 Nissan Altima,I'm having a code p0303 and replaced the coil,plug and the injector also tested it for compression and it is good..still the code keeps popping up..what else can it be?
Cars & Trucks - Nissan
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Answers & Comments
Need to do a running compression test at idle and 2500 rpm to test for worn cam lobes and valve sealing issues .
What engine > 2.5 or 3.5 L ? What ignition system ? Is the ECU controlling the injectors or coil (s) ? Checking battery voltage to the coil an fuel injector on that cylinder with a voltmeter is what you should do. Not just replace parts . Also checking to see if the ECU is supplying a ground to those circuit's . Video's on youtube showing how to test ECU driver circuit's . Also looking at wiring diagrams so you know which circuit's to test .
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