1992 Mazda 929 Smoke When Accelerating

MAZDA 929
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VINZON213
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  • 1 POST
I have a 1992 Mazda 929. I noticed that a lot of smoke comes out when the car is just starting to pick up speed but smoke stops coming out when its already running fast. What could be the problem?
Jan 8, 2007 at 1:30 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Sounds like valve seals but try changing the PCV valve and see what happens to the smoke-I've been here before 323/626

Do you see the smoke a lot while decelerating if so remove spark plugs and read it. wet with oil means the combustion chamber is leaking. You can do a compression and leak down test to id the problem

Do you consume a quart of oil less than 500 miles-
Jan 8, 2007 at 7:07 PM
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COSMO
  • ✓Experienced Mechanic
  • 347 POSTS
Yah try changing the PCV valve...if you have a 3.0L sohc engine in it, you might have a leaking valve seal (s). Its not uncommon with the older 3.0L to do this.

Cosmo....Mazda TEch
Jan 8, 2007 at 10:14 PM

Suggested Repair

Replace the PCV valve first and see if the smoke stops. If oil smoke continues, especially while decelerating, inspect the spark plugs for oil and perform compression and leak-down tests to check for leaking valve seals, which are common on older 3.0L engines.

Conversation Summary

The owner of a 1992 Mazda 929 reports smoke when the car begins to pick up speed that stops once it is running faster. Experts recommend trying a PCV valve replacement first. If the smoke persists, they suggest checking the plugs for oil and doing compression and leak-down tests for leaking valve seals.

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