The Ford Barn - View Single Post - Compression test and Vacuum test readings need help

Jim Brierley · 12-09-2019, 11:26 AM

3 and 4 being lower could mean the head gasket is leaking between the two. Try re-torquing the head first, may need a new gasket? A leak-down test would be more conclusive. If that is the problem, it could also cause the vacuum readings you have.

12-09-2019, 11:26 AM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Compression test and Vacuum test readings need help 3 and 4 being lower could mean the head gasket is leaking between the two. Try re-torquing the head first, may need a new gasket? A leak-down test would be more conclusive. If that is the problem, it could also cause the vacuum readings you have.