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Old 06-07-2018, 09:07 AM   #1
s10mk
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Join Date: Jul 2017
Location: herminie, pa
Posts: 313
Symptoms of a burnt exhuast valve?

Hello everyone,
What are the driving symptoms of a burnt exhuast valve? My truck idles and drives very well, and it still has good mid-range power. But recently it developed a high-load/ high rpm miss. I did a compression test, and cylinder 5 has 75 psi of cranking pressure, cylinder 2 has 95 psi of cranking pressure. The rest of the cylinders all have 120 psi while cranking. I then did a leak down test, and cylinder 5 is clearly leaking out of the exhuast valve. While cylinder 2 appears to be leaking past the rings, I also squirted some oil in number 2 and compression jumped from 95 pounds to 115.

I guess my question is, what would these issues "feel like" while driving?
Thank you!
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2009 GMC Sierra 1500
2006 Buick Lacrosse
1987 Chevrolet V10
1972 Chevrolet c20 350/350
1967 Chevrolet Biscayne ls3 swapped
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