Quote:
Originally Posted by Luckyed
All the AOS failures I have seen resulted in white smoke. Is it common for the issue to sometimes result in black smoke?
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Yes, it can IF the manifold vacuum and planets align well enough to add fuel trim, resulting in excess enrichment, which leads to black smoke.
People think that every AOS fails the same way, thats not the case- symptoms and exact failure varies. I have seen AOS' fail and the engine never smoke at all, just make a vacuum squeak past the front main seal, and turn on the OP light, then fail like the original poster's has.
Because people don't know all the modes of AOS failure we see cars that are thought to have completely failed, and all they needed was an AOS. I have received these cars after plucking them off dealer lots 3,000 miles away, and fixed the issue in less than 1.5hrs.
That guy was told that he needed a 22K engine, I fixed it for 400 bucks.