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Old 05-31-2012, 05:13 PM   #1
2L82RUN
 
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Blinking CEL?

I've recently noticed I'm getting a blinking CEL at times while driving. It's not setting a code of any type and doesn't seem to affect performance at all. Does anyone have any idea what is going on? I'm running 8-9psi with a boost cam. Any ideas welcomed
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Old 05-31-2012, 05:22 PM   #2
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Hmmm.....

So you have a CEL but no codes are showing up on your scanner/sct/whatever you use?

Might be the light malfunctioning...?
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Old 05-31-2012, 05:22 PM   #3
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code reader would be a smart investment
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Old 05-31-2012, 05:23 PM   #4
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Quote:
Originally Posted by xx_ED_xx View Post
code reader would be a smart investment
By saying it's not throwing codes I'd assume he means nothing is appearing on his scanner.

If he doesn't have a scanner...


lol
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Old 05-31-2012, 05:27 PM   #5
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Yep. Have a scanner. No codes setting. CEL will blink for up to 30 secs or so and then go away. Hasn't stayed on to this point. Owners manual mentions a blinking CEL and refers to a misfire. If that's the case it may be the cam but I never noticed it blinking until the past week or so
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Old 05-31-2012, 05:35 PM   #6
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I had a cel come on for a while then go off. When it was on I read the code and it was the o2 sensor. Then it would go away and come back on for a day or two and disappear. As of right now no cel....
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Old 05-31-2012, 05:37 PM   #7
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If the CEL is flashing there is a code PERIOD. Get a scanner that can read it
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Old 05-31-2012, 05:42 PM   #8
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What rpm do you idle at?

Does RPM drop sharply after you stop accelerating?
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Old 05-31-2012, 05:49 PM   #9
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flashing cel is a p0300 random misfire
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Old 05-31-2012, 05:49 PM   #10
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Check your plugs, I worked on a silverado with a 5.3 had a small cam and a couple of other minor supporting mods with an occasional flashing cel without and codes, found 3 fouled plugs...just a thought, same engine family with similar problem as you are describing
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Old 05-31-2012, 05:52 PM   #11
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Quote:
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flashing cel is a p0300 random misfire
Thanks. That's what I was looking for. I was setting p0300 after cam install on occasion. Tuner advised it was due to the cam lope and computer throwing the code thinking it was a misfire. He tuned the code out so that's probably why I'm seeing it blink now without setting the code
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Old 05-31-2012, 06:07 PM   #12
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there is a table in the ecm that is time between crankshaft targets vs rpm if the car takes to long between events it thinks there's a misfire. when the car lopes because of the cam it takes too long between targets and sees a misfire and since there's no rhyme or reason to the lope vs cyl # it thinks its random, not isolated to a cylinder. if the code is deleted then you loose that diag capability completely, rather those thresholds need to be raised in the idle region and left alone elsewhere so the code can still function.
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Old 05-31-2012, 06:44 PM   #13
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I had the same error and was a ignition cable not properly connected to a spark plug.
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Old 04-15-2013, 11:20 AM   #14
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Quote:
Originally Posted by 2L82RUN View Post
Thanks. That's what I was looking for. I was setting p0300 after cam install on occasion. Tuner advised it was due to the cam lope and computer throwing the code thinking it was a misfire. He tuned the code out so that's probably why I'm seeing it blink now without setting the code
I also have the same issues after installing cam... blinking CEL and after 30 seconds its gone.

What was your solution ? Did you change anything ?
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Old 04-15-2013, 01:38 PM   #15
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i agree, random misfire code
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Old 04-16-2013, 09:17 AM   #16
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Talk to your tuner. Does the car actually feel like a miss or does it seem fine? If it seems fine you are likely OK just need to revisit the tune on the car. If the car actually feels like its missing you can be doing damage to the cats. That is the intention of the light flashing instead of just steady on.
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Old 04-16-2013, 09:40 PM   #17
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I was getting a blinking cel and no codes. I got a scan gauge ll and it shows codes that the computer has found as well and its throwing a p0650 which is cel light malfunction. No issues with performance whatsoever. It doesn't blink all the time either. Just once in a blue moon. that p0650 code has never showed on a regular scanner nor thrown the cel light before. Food for thought.
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Old 04-17-2013, 03:48 AM   #18
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Thanks guys

Just took a look yesterday on the plugs and wires...all fine and in good condition, car drives fine and have power.

After disconnect the plugs and wires yesterday no blinking CEL... i will watch it for the future

Yeah we also didnt find a code on the scanner

Maybe i will proof it at my tuner on saturday with another scanner if we find a code
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