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Old 07-19-2020, 01:44 PM   #1
NW Sam
 
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Lightbulb Check engine light flashing

Hi guys,
Anyone have there check engine light start flashing at them after hard acceleration. My '17 ZL1 did this last night after merging onto the freeway.
The car didn't seem to have any issues accelerating. I got home plugged my scanner into the car. There is a code P0300 Misc Multiple Misfires. Any help would be appreciated.
Thanks, Sam
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Old 07-19-2020, 03:14 PM   #2
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Misfire my man. Look for a cracked spark plug or bad plug wire. I’m assuming you’re running good gas...
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Old 07-19-2020, 05:23 PM   #3
NW Sam
 
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Hi Josh,
I buy ethanol free gas from the local co op, along with several other guys in our car group. I haven't heard anybody else complain about the fuel, but I will ask. I will have to pull the plugs and check them.
Thanks
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Old 07-19-2020, 05:25 PM   #4
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Flashing CEL is always a misfire, and your code confirms it.

Definitely check it out before it gets worse. You can destroy your cat very quickly otherwise.
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Old 07-19-2020, 09:27 PM   #5
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have you made any modifications?
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Old 07-20-2020, 01:35 PM   #6
NW Sam
 
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Rotofab CAI
Tony Mamo Throttle body
Both of these mods have been on the car for 3 yrs.

I am pulling the spark plugs and going to replace.
Thanks for all the help, Sam.
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Old 07-20-2020, 01:51 PM   #7
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Not saying you have the same issue I do but I had the flashing check engine light and now dealer is saying I need 4 injectors. cylinder 1-3-5-7 not fun
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Old 07-20-2020, 05:56 PM   #8
NW Sam
 
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Quote:
Originally Posted by NITEMER View Post
Not saying you have the same issue I do but I had the flashing check engine light and now dealer is saying I need 4 injectors. cylinder 1-3-5-7 not fun
Do you know what code the dealer retrieved from the computer?

How did your engine run, any hesitation or running rough?
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Old 07-21-2020, 08:05 AM   #9
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Quote:
Originally Posted by NW Sam View Post
Do you know what code the dealer retrieved from the computer?

How did your engine run, any hesitation or running rough?
I just had rough cold starts not really any hesitation once it was warm, it has the P0300 code.
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Old 07-21-2020, 09:56 AM   #10
EDFHOBBIES
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Its a bad injector got the same thing going on now rough til warms a bit.. once warm no more codes no more misfire. i did plugs and wires 1st didn't help. seems to be worse if car sits a few days.

you probably will get a stability track light as well.

I'll pull blower soon replace with plus 30's or better and lingenfelter pump..
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Old 07-21-2020, 12:58 PM   #11
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Quote:
Originally Posted by EDFHOBBIES View Post
Its a bad injector got the same thing going on now rough til warms a bit.. once warm no more codes no more misfire. i did plugs and wires 1st didn't help. seems to be worse if car sits a few days.

you probably will get a stability track light as well.

I'll pull blower soon replace with plus 30's or better and lingenfelter pump..
Ye i get the stability track light as well. Im trying to get GM to cover the repair but if they dont I will replace them my self.
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Old 05-03-2021, 02:51 PM   #12
joeyazzata29
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Did you find out what this was? ‘21 SS 1le here only P0300 at track days… I can’t get it to do it on the street
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Old 05-03-2021, 06:09 PM   #13
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I've had this happen a few different ways

1) Spark plug wire not fully seated
2) Connector at the coil pack with recessed pin

The 2nd one was a bastard, it wouldn't happen on dyno and would only happen on street, likely due to different vibrations.
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Old 05-03-2021, 06:51 PM   #14
joeyazzata29
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Quote:
Originally Posted by LiqTenExp View Post
I've had this happen a few different ways

1) Spark plug wire not fully seated
2) Connector at the coil pack with recessed pin

The 2nd one was a bastard, it wouldn't happen on dyno and would only happen on street, likely due to different vibrations.
It’s just really weird that mine will only do it at a track day. It did it once at the end of a straight around 120mph getting off the gas, and once at like 40mph part throttle.

I would think if mine was either of those issues you described it wouldn’t go back to normal and make it all the way home at 85mph by reconnecting the battery?
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