1990 Honda CRX burning oil

1990 HONDA CRX
162,600 MILES • 4 CYL • FWD • MANUAL
Avatar
CHEEZWIZEATER
  • MEMBER
  • 1 POST
When i drive my car and if i rev it too high i get a smell fo burning oil for about a minute and a half and then it goes away. How do i know on a leakdown test if it is the piston rings leaking or valve seals?
Oct 26, 2009 at 5:30 PM
Advertisement
Avatar
MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Hi there, A leak down test will show the condition of the compression rings but not the efficiency of the oil control ring, and it wont show faulty valve stem seals, rule of thumb is, if it smokes when first started then clears up this is normally valve stem seals, oil burning under power or over run, that is high road speed then back off the throttle is usually rings as there is not the volume of oil passing through the stem seals to show up for very long. When the engine sits hot, the thin oil can run past the worn stem seals and sit on the valve this builds up for a time till the oil thickens up and this oil is burnt in a puff of smoke on start up.

Mark (mhpautos)
Oct 26, 2009 at 6:43 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.