1978 Buick Skylark

1978 BUICK SKYLARK
35,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
GRAMPDOC
  • MEMBER
  • 1 POST
Where to start for diagnosing engine oil blowing back through hose to and into breather filter. PCV valve seems to be functioning, and engine seems to be running fine. Also, compression test seems to check out within specifications. The engine has an EGR valve and a four port "switching?" device. I have a vacuum tester and additional vacuum gauge, dwell meter, and multitester, but I don't have a functioning inductive timing light. Thank You.
Jul 21, 2009 at 4:33 AM
Advertisement
Avatar
HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
You might see if there is agasket on the oil cap or just get a new one. there should be a little vacuum on the valve cover. Check the hose to the pcv and see if it is partially blocked as that used to happen. Otherwise change the breater filter every 12,000 miles as these had poor bffling inside the valve cover.
Oct 31, 2009 at 5:51 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.