1999 Hyundai Elantra GLD black/grayish smoke

Martin Mladenovski

Asked by Aug 14, 2013 at 08:58 PM about the 1999 Hyundai Elantra

Question type: Maintenance & Repair

I recently went on a vacation trip with a camping trailer attached to my Elantra and I noticed that it lacked power in the uphill
sections. Also about a kilometer into the journey the car started spewing black smoke from the exhaust. I came across a forum
thread which stated that the oxygen sensor in the exhaust is to blame but can that really be the reason why it's lacking power? If
not what's the problem?

1 Answer


Black smoke from the exhaust is always an overly rich air/ fuel mixture. In other words too much fuel. The lack of power is because the spark plugs are gasoline fouled and not firing correctly. You're also killing your catalytic converter. Check your air filter first. Then check your fuel pressure regulator, and also check for leaking fuel injectors. HTH. -Jim

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