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I have a Flashing check engine light, (po307) “Service

Customer Question
traction control” “service stabilitrak” lights...
I have a Flashing check engine light, (po307) “Service traction control” “service stabilitrak” lights up as well,
I have spark from coil and plugs have been replaced, please advise
Submitted: 8 months ago.Category: Chevy
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Answered in 2 minutes by:
12/12/2017
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago
kalamykid
kalamykid, Shop Owner/ Tech
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The first thing you should do would be to do a compression test on cylinders 3,5 and 7 so you have something to compare cylinder 7 with. Also with the plugs out look at the color of the plug for cylinder 7 and tell me what it looks like or send me a pic of it so I can see how the cylinder is burning.

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Customer reply replied 8 months ago
Ok, I will have to pick up a compression gauge ,You thinking possibly internal engine issue?
Customer reply replied 8 months ago
I will pull plug and take a pic, need to go run an errand first
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Either you have lo compression, an injector that is not spraying fuel into the cylinder, or the coil is not getting a signal to fire. The compression test and pic of the spark plug will give me a better idea where to start the testing to repair this problem,.

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Customer reply replied 8 months ago
Ok, will do, I have spark at coil
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

That is good, Now we just need to check the other three possibles.

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Customer reply replied 8 months ago
No 7 Plug is wet with fuel, compression is 90
Customer reply replied 8 months ago
Number 3 is 105 and number 5 is 103
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

You will need to pull the valve cover off and inspect the rocker arms, and valve springs.

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Customer reply replied 8 months ago
What’s your thinking
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

I am hoping that you have a broken valve spring, and the valve is not closing all the way.

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Customer reply replied 8 months ago
Ok if that’s not it , what’s next?
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Replace the injector for cylinder 7 and see if the old one was leaking to much fuel into the cylinder.

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