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1997 Nissan 240SX Smoke off the line and effect on Cat Con

Tiny
UPSSOLDIER
  • MEMBER
  • 1997 NISSAN 240SX
  • 4 CYL
  • 2WD
  • MANUAL
  • 175,000 MILES
My car has been running without a main Cat Converter for some time now and I would like to get a new one. The pre-cat is still intact and smells when running on the highway after awhile. Should I replace both Cat's? Also, my car smokes from the tail pipe off the line. It burns significant oil. Will this mess up any new cat converter I try to install? What can I do to fix the smoking problem?
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Thursday, August 13th, 2009 AT 5:44 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

Thank you for the donation,

Significant oil contamination will affect the performance and life of the cat converter, I would do a comp test and check the ring condition, if you have a serious blow by problem due to faulty rings, this should be addressed first.

Mark (mhpautos)
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Thursday, August 13th, 2009 AT 5:57 PM

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