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Old Feb 16, 2025 | 11:23 AM
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Default Check engine light help

Drove the vette last night for only second time , had check engine light blink for a few seconds and came off while I was driving , scanned the car and got code
p0300 any feedback would be appreciated , 2006 z06 28k miles
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Old Feb 16, 2025 | 11:46 AM
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Check to make sure all of your spark plug boots are inserted correctly onto the plug and the coil pack. It's very common for these to come loose, especially at the coil pack.
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Old Feb 16, 2025 | 11:49 AM
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Also the code reader said pending when it read that code not sure what that implies
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Old Feb 16, 2025 | 01:12 PM
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Blinking check engine light means it may damage your cats...the misfire did not occur on the next drive cycle so it will only show pending...other than plugs or wires one needs some advanced diagnostic equipment to accurately diagnose it...what part of Florida are you located ??
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Old Feb 16, 2025 | 01:14 PM
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Broward , the light came on blinked but then turned off and didn’t come back on

Originally Posted by C5 Diag
Blinking check engine light means it may damage your cats...the misfire did not occur on the next drive cycle so it will only show pending...other than plugs or wires one needs some advanced diagnostic equipment to accurately diagnose it...what part of Florida are you located ??
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Old Jun 28, 2025 | 05:13 PM
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Not sure what these values mean


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Old Jun 28, 2025 | 05:21 PM
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Looks like cylinder #1 is your misfiring cylinder…hope you haven’t been driving around for 4 months with a misfire.
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Old Jun 28, 2025 | 07:23 PM
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Car is garage kept drove it few times on weekend but not far , I changed the plugs , should I change cylinder 1 wire or coil?


QUOTE=C5 Diag;1608915344]Looks like cylinder #1 is your misfiring cylinder…hope you haven’t been driving around for 4 months with a misfire.[/QUOTE]
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Old Jun 28, 2025 | 07:30 PM
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I recommend DIY’ers just change plugs and wires…coil packs usually don’t go bad…if you change those 2 parts and you still have a misfire it’s best to seek out a diagnostic shop…you need specialized equipment to check all the other stuff.
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Old Jun 28, 2025 | 10:14 PM
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Originally Posted by Howbtdemcowboys
Car is garage kept drove it few times on weekend but not far , I changed the plugs , should I change cylinder 1 wire or coil?
I just want to clarify, you changed the plugs after you got the check engine light? Or you changed the plugs first and then you got the check engine light?
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Old Jun 28, 2025 | 10:32 PM
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I changed it last month after I saw the light

Originally Posted by TorchRedFred
I just want to clarify, you changed the plugs after you got the check engine light? Or you changed the plugs first and then you got the check engine light?
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Old Jul 1, 2025 | 08:15 AM
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Originally Posted by C5 Diag
I recommend DIY’ers just change plugs and wires…coil packs usually don’t go bad…if you change those 2 parts and you still have a misfire it’s best to seek out a diagnostic shop…you need specialized equipment to check all the other stuff.
how can i diagnose it my self for a bad injector
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Old Jul 1, 2025 | 08:31 AM
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You will need a fuel pressure gauge and a factory level scan too to perform an injector balance test or with an injector “pulser” which you can buy on Amazon…you should also check the resistance across the injector looking for 11-14 ohms…read the procedure below.




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Old Jul 1, 2025 | 09:05 AM
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thank you!!! is there a reason why it didn't set a code ?

Originally Posted by C5 Diag
You will need a fuel pressure gauge and a factory level scan too to perform an injector balance test or with an injector “pulser” which you can buy on Amazon…you should also check the resistance across the injector looking for 11-14 ohms…read the procedure below.



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Old Jul 1, 2025 | 09:22 AM
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Originally Posted by Howbtdemcowboys
thank you!!! is there a reason why it didn't set a code ?

A clogged injector would not set a P0300…the engine computer has no way to determine that your injector is clogged…when there is no combustion the crankshaft slows down and the crankshaft position sensor sees that and sets a misfire code…if you had an issue with the injector wiring that would set a P0200 I believe.
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Old Jul 1, 2025 | 03:46 PM
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Swap the coil if misfire follows there is your issue. If it is coil I would replace all. Been through similar in a BMW 3 Series.
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Old Jul 2, 2025 | 06:41 PM
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Just noticed the cylinder 1 injector clip is missing a washer , could that’s cause an issue , where can I get this washer?
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Old Jul 3, 2025 | 03:27 PM
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Old Jul 3, 2025 | 04:47 PM
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So misfires on 2 and 6 ??
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Old Jul 3, 2025 | 05:42 PM
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Car warmed up and the misfires went away lol idk what’s going on

Originally Posted by C5 Diag
So misfires on 2 and 6 ??
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