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08-20-2023, 07:47 PM
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Junior Member
 Join Date: Jul 2010
Location: Goodyear, AZ
Posts: 65
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250 inline 6 cylinder #1 Low...What to check next?
Hello All,
I just compression tested the 250 in my 1978 GMC C15. #1 cylinder tested at 65 PSI. The other 5 cylinders were in the 160s. I poured a little oil into cylinder 1, and the PSI went up 5 to 70psi. I didn't wet test the other 5 since there were pretty high already. I'm not sure what to test next. Any suggestions? |
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