I have taken my car to the Hyundai dealership and 2 different mechanics and nobody can figure out what is going on. After driving at least 8 miles on the freeway, my car starts bogging out when I get off the freeway. When I go from a complete stop and try to go again, the car jumps and makes a grinding noise, then black smoke blows out the back. I have to romp on the gas to get the car to go. My oil doesn't seem to leak, but it burns through oil quickly.
How long has your 2010 Hyundai Elantra had this problem?
Noticed it 4 months ago after changing spark plugs, valve cover, and gaskets
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Hello, sounds like there could be more than one possible cause of concern here.
First, I would recommend checking ignition spark, fuel pressure and delivery and air intake systems to see If there is an engine performance concern related to this issue.
Second, I would suggest checking oil consumption. How do the spark plugs look? Are they soaked in oil? Is there a possible concern causing compression issues?
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