2002 engine light blinking
Joined: Nov 2001
Posts: 34,623
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From: Schiller Park, ILL Member: #317
The only (correct) reason for the SES light to "blink/flash" would be a serious misfire. And this will be accompanied by misfire codes, including P0300 (random multiple misfires) and a P030x (x = 1-8, which would be the cylinder specific misfire code).
If there are no codes present but you're seeing a flashing SES light, there's either a wiring problem or a PCM hardware/tuning problem.
If there are no codes present but you're seeing a flashing SES light, there's either a wiring problem or a PCM hardware/tuning problem.
Joined: Nov 2001
Posts: 34,623
Likes: 2,541
From: Schiller Park, ILL Member: #317
So then you ARE seeing a P0300 code. You said this was not happening in post #1, so I assume the situation has changed?
In any event, you have a misfire.
Do you have access to a scanner that shows cylinder specific misfire data? That would be helpful, but not entirely necessary to begin diagnostics. You can also look at fuel trims (if you have a comprehensive scanner) for anything out of sorts on one bank or the other. Additionally, there should be some freeze frame data on that P0300 code to help you determine when (and under what conditions) the code was triggered; that also might help with the diagnostics. Otherwise, first step would be a basic check of plugs and wires (for fouled plugs and/or failing wires leading to weak spark/lost spark), as well as obvious/easy checks such as the air filter and MAF for debris/grime and/or obstructions, etc.
In any event, you have a misfire.
Do you have access to a scanner that shows cylinder specific misfire data? That would be helpful, but not entirely necessary to begin diagnostics. You can also look at fuel trims (if you have a comprehensive scanner) for anything out of sorts on one bank or the other. Additionally, there should be some freeze frame data on that P0300 code to help you determine when (and under what conditions) the code was triggered; that also might help with the diagnostics. Otherwise, first step would be a basic check of plugs and wires (for fouled plugs and/or failing wires leading to weak spark/lost spark), as well as obvious/easy checks such as the air filter and MAF for debris/grime and/or obstructions, etc.
Joined: Nov 2001
Posts: 34,623
Likes: 2,541
From: Schiller Park, ILL Member: #317
Knock sensor is not the reason for your misfire, that's a separate issue. Knock sensors are located underneath the intake manifold and would require manifold removal to be replaced.
Address the P0300 as outlined above.
Address the P0300 as outlined above.
