No compression on one cylinder number seven

170 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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LEE KELLEY
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  • 4 POSTS
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.
Sep 30, 2018 at 10:18 AM
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DANNY L
  • ✓Experienced 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
Sep 30, 2018 at 10:27 AM
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LEE KELLEY
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Yes that all have around 110.
Sep 30, 2018 at 11:28 AM
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LEE KELLEY
  • MEMBER
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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?
Sep 30, 2018 at 11:29 AM
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DANNY L
  • ✓Experienced 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-
Sep 30, 2018 at 1:22 PM
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LEE KELLEY
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  • 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.
Oct 1, 2018 at 9:49 AM
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