flashing check engine light

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Apr 6, 2005 | 04:21 PM

Greg Fell

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From: Morton IL

flashing check engine light

P0300 is turned off ('Does Error set SES' = 'Off', 'error mode' = 'Type X = turned off')

any idea's what this could be? if i remember correctly, when i was messing around with the car, and i turned this back on, it would just set a check engine light...not sure how to track this down.

the light flashes occasionally for 10-30 seconds at 1500-1900ish RPM's.

Apr 6, 2005 | 04:39 PM

kpowr82

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Flashing SES generally means misfire on multiple cylinders. Not sure if that is the only code that causes the light to flash though. Maybe someone else can chime in.

Apr 6, 2005 | 04:57 PM

Greg Fell

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From: Morton IL

if you turn off P0300 should it still cause a flashing light if it misfires?

Apr 6, 2005 | 07:50 PM

MeanWS6

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flashing has something to do with CATs

Apr 6, 2005 | 08:18 PM

Turo

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It's damn near impossible to guess what it could be. Get the code pulled, Autozone does it for free, then let us know what the code is and we will be able to help you better.

Apr 6, 2005 | 09:45 PM

Greg Fell

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From: Morton IL

I have a corvette (can read codes with its PCM) and atap...no codes.

I do not have cat's either, and the back O2's are turned off.

Does anyone have any knowledge to this?

Apr 6, 2005 | 11:13 PM

soundengineer

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Quote:

Originally Posted by MeanWS6

flashing has something to do with CATs

um...NO

if it flashes it is a Misfire as stated directly in your GM owners manual for your vehicle....

P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0304 Cylinder 4 Misfire Detected
P0305 Cylinder 5 Misfire Detected
P0306 Cylinder 6 Misfire Detected
P0307 Cylinder 7 Misfire Detected
P0308 Cylinder 8 Misfire Detected

you will have to find out what code is being thrown for sure...but this is the list.
go to any Advanced auto and ask them to read your codes for free...it will tell you an exact code.... or if you have autotap or hptuners or EFI live you can read it too...

a few simple things to check....
Spark plug wires...commonly melted by aftermarket headers
spark plugs...sometimes thay go bad...foul out...even sometimes short out if you accidentally put it in too tight and crack the ceramic on the plug
coil paks...no spark or bad spark...but usually not a misfire code

sometimes a plug will work its way lose or a wire can come loose...or sometimes during a change you really just dont get it back tight....

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