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How do I fix a oil leak that I cant find where its coming from.

Tiny
PARKS55
  • MEMBER
  • 1991 NISSAN 300ZX
When the oil leak began there was a lot of black smoke coming from the exhaust The car when started after I clean the spark plugs runs fine for bout half and hour then it starts to sound like it has a miss in the engine then the black smoke comes from the exhaust. What can be the problem with the engine. I bought a new engine seal kit for it and was wondering if changing the seals would fix the problem.
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Thursday, December 8th, 2011 AT 6:29 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Black smoke usually indicates a rich fuel mixture. As far as the oil leak, you can get a dye to add to the oil. Drive the vehicle and then check for the leak with a black light. The dye will glow.
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Thursday, December 8th, 2011 AT 6:35 PM
Tiny
DKBLUE300ZX
  • MEMBER
  • 1 POST
Easy enough to see a leak off a manifold, try placing cardboard under the engine area so the drippings will probably show. The black light system does work on small crack leaks like on a transmission case or a cracked engine block, good luck.
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Monday, January 23rd, 2012 AT 10:07 PM

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