Low compression in one cylinder. Should I change vacuum solenoid and EGR valve or should I not?
Monday, September 11th, 2017 AT 10:59 PM
1 Reply
STEVE W.
MECHANIC
13,480 POSTS
How low is low? Have you done a leak down test to determine what is causing the low compression?
Until you know what is happening changing anything would be a bad idea. Especially as loss of compression in one cylinder usually means an internal engine issue, not anything external.
Do a cylinder leak down test on the low cylinder and see where it leads.