Low compression in one cylinder. should I change vacuum solenoid and EGR valve or should I not?
Sep 11, 2017 at 10:59 PM
Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
Advertisement
STEVE W.
CAR REPAIR CONTRIBUTOR
15,148 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.