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Richard Harston
Richar ... 1/24/2012
1982 Mazda B2200 Sundowner Base 4Cyl2.2L - Engine
Why is my 2.2 diesel hard to start, emit blue smoke out of exuast, miss fire only first start of day after that mormal
start with no smoke, rough idle or missing. I had the engine overhauled about 2000 miles ago
1 Answer
  • Spoon Sports
    Spoon Sports 1/24/2012
    Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles.

    How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.
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