Question about 1998 Volvo V70
The knocking noise of these engines is usually from vacuum pump. Just remove the 6 torx screws from vacuum pump cover with a hot engine and let the oil drain from it overnight. Be careful not to loose any part of vacuum pump - has 2 metal one way valves, one plastic valve and two rubber parts one big seal and a washer. Remember how it was installed and clean those parts with care before assembly. The hose on vacuum pump cover doesn't need to be removed - rub clean cover with cotton cloth. The tractor-like knocking sound was gone on my car!
Posted on May 31, 2012
Weak oil pressure, and or wrist pin clearance.try heavier weight oil.if you use 10w-30 try 20w-50 can band aid the problem..but this may help just about all gm 1500's 2000 up to 2009 have the same problem from the show room floor
Posted on Jun 08, 2010
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Posted on Jan 02, 2017
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