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Check engine light flashing then goes away

Asells
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joshc64311 Enthusiast

joshc64311

Posted
Posted (edited)

how did you know to replace it? Light hasn't come back on. I did check the plug wires. Some seemed a bit loose.

I pulled the plug and it looked good, than changed the plug wires to aftermarket with 1/4 of the ohm resistance of stock and it still would pop up going up hills, so I found a new coil off of gmpartsdirect.com for $30 if I remember correctly and the problem has never came up again been 10k miles. I made a post about it on here

Search, Cylinder 5 misfire help might help

Edited by joshc64311
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j13smiley
j13smiley

Flashing light still indicator for misfire? It was on older gm cars. ..

swathdiver
swathdiver

A bad cell in a battery that otherwise passes all tests can cause all kinds of gremlins.  So can corroded ground wires.   Make sure your battery and alternator are within specifications and

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Asells Enthusiast

Asells

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Posted

I pulled the plug and it looked good, than changed the plug wires to aftermarket with 1/4 of the ohm resistance of stock and it still would pop up going up hills, so I found a new coil off of gmpartsdirect.com for $30 if I remember correctly and the problem has never came up again been 10k miles. I made a post about it on here

Search, Cylinder 5 misfire help might help

Well atleast I know what to look for if it pops up again. How did you know it was cylinder 5 though?
joshc64311 Enthusiast

joshc64311

Posted
Posted (edited)

Well atleast I know what to look for if it pops up again. How did you know it was cylinder 5 though?

Scan tool the code should be stored , if I were you I'd pull that plug,that would narrow it down quickly and eliminate some stuff

Edited by joshc64311
Asells Enthusiast

Asells

Posted
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Posted

Scan tool the code should be stored , if I were you I'd pull that plug,that would narrow it down quickly and eliminate some stuff

No codes stored on mine. But I will pull the plug. What should it look like? I have about 30k miles.

joshc64311 Enthusiast

joshc64311

Posted
Posted (edited)

No codes stored on mine. But I will pull the plug. What should it look like? I have about 30k miles.

Similar to this. This one has 30k on it

post-141011-0-61994900-1503621376.jpg

post-141011-0-43627500-1503621394.jpg

post-141011-0-61994900-1503621376.jpg

post-141011-0-43627500-1503621394.jpg

post-141011-0-61994900-1503621376.jpg

post-141011-0-43627500-1503621394.jpg

post-141011-0-61994900-1503621376.jpg

post-141011-0-43627500-1503621394.jpg

Edited by joshc64311
  • 1 year later...
Frankielozano214 Senior Enthusiast

Frankielozano214

Posted
Posted

So I just had the same thing happen to my truck 2014 Silverado crew cab, 74000 miles check engine light flashing but goes away did it several time today first time. I recently had a tune done on the truck and turn off the afm and changed the cam n lifter to regular lifters. The check engine doesn’t stay lit

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
1 hour ago, Frankielozano214 said:

Feel lose of power when going up a incline even on freeway... any help would b appreciated 

Flashing CEL is not a good thing.

 

I would have it checked for stored codes and see what is up.

 

If the light is flashing : A

malfunction has been detected that

could damage the emission control

system and increase vehicle

emissions. Diagnosis and service

may be required.

To help prevent damage, reduce

vehicle speed and avoid hard

accelerations and uphill grades.

Frankielozano214 Senior Enthusiast

Frankielozano214

Posted
Posted
1 hour ago, JimCost2014 said:

Flashing CEL is not a good thing.

 

I would have it checked for stored codes and see what is up.

 

If the light is flashing : A

malfunction has been detected that

could damage the emission control

system and increase vehicle

emissions. Diagnosis and service

may be required.

To help prevent damage, reduce

vehicle speed and avoid hard

accelerations and uphill grades.

I tried going to a small shop

they said they couldn’t check it if the check engine light was on 

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
1 hour ago, Frankielozano214 said:

I tried going to a small shop

they said they couldn’t check it if the check engine light was on 

Go to an O'Rielys, Auto Zone, any parts store, they will scan it for free.

 

Codes are stored, they just have to retrieve them.

 

There are numerous scan tools for around $100.00 that you can buy and do it yourself. I just bought A Blue Driver OBD2 scan tool off of Amazon for $100.00 and change.

Frankielozano214 Senior Enthusiast

Frankielozano214

Posted
Posted
3 minutes ago, JimCost2014 said:

Go to an O'Rielys, Auto Zone, any parts store, they will scan it for free.

 

Codes are stored, they just have to retrieve them.

 

There are numerous scan tools for around $100.00 that you can buy and do it yourself. I just bought A Blue Driver OBD2 scan tool off of Amazon for $100.00 and change.

I stopped by o’rielys they said they couldn’t check it if it didn’t have check engine light on, smh. I might try a different store tomorrow. Thanks

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
4 hours ago, Frankielozano214 said:

I stopped by o’rielys they said they couldn’t check it if it didn’t have check engine light on, smh. I might try a different store tomorrow. Thanks

No problem, surprised that no one is being any help to you.

 

You don't by chance still have On Star active, if you do they can check it for you.  

Frankielozano214 Senior Enthusiast

Frankielozano214

Posted
Posted
9 hours ago, JimCost2014 said:

No problem, surprised that no one is being any help to you.

 

You don't by chance still have On Star active, if you do they can check it for you.  

Actually I do I’ll try that I didn’t know they can check it too

JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
8 hours ago, Frankielozano214 said:

Actually I do I’ll try that I didn’t know they can check it too

Yes sir, as long as you have an active (the correct one) subscription, they will have full access to your truck.

 

Were they able to help?

Frankielozano214 Senior Enthusiast

Frankielozano214

Posted
Posted
2 hours ago, JimCost2014 said:

Yes sir, as long as you have an active (the correct one) subscription, they will have full access to your truck.

 

Were they able to help?

Well it actually flashed then stayed on code is p0308 a misfIre cylinder #8 hopefully nothing more then that, recent got it tuned now truck runs like shit, and to get the afm tune off since I deleted afm

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