No compression on one cylinder number seven

LEE KELLEY

MEMBER
2009 CHEVROLET SILVERADO
5.3L
V8
4WD
AUTOMATIC
170 MILES

My Stabilitrak and traction control lights are on check engine lights flashing and I have no compression on one cylinder number seven. Does that mean that the engine is bad or good? The Stabilitrak and all that stuff be sending a code into limp mode.

Sunday, September 30th, 2018 AT 5:18 PM

5 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

Did you perform a compression check in all the cylinders? What were the readings?Hope this helps and thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/how-to-test-engine-compression

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Sunday, September 30th, 2018 AT 5:27 PM

LEE KELLEY

MEMBER
4 POSTS

Yes that all have around 110.

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Sunday, September 30th, 2018 AT 6:28 PM

LEE KELLEY

MEMBER
4 POSTS

This speech to yes they all have around 110. Could the Stabilitrak and traction control light flashing on and off make the truck going limp mode and do something to cause no compression?

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Sunday, September 30th, 2018 AT 6:29 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

No, having the Stabilitrak on would not cause a loss of compression. Try a wet compression test by adding a little bit of motor oil into the affected cylinder. If you do this and the compression goes up a little you will know the piston rings are the problem. Hope this helps and thanks again for using 2CarPros.
Danny-

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Sunday, September 30th, 2018 AT 8:22 PM

LEE KELLEY

MEMBER
4 POSTS

I am sorry I did the compression test I did not have it in all the way or something I re did it this evening all the cylinders have between 1: 10 and 1: 20.

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Monday, October 1st, 2018 AT 4:49 PM