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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

94 Toyota Supra TT, Big Time Smoke Screen
Q: I have a Ď94 Toyota Supra twin turbo. I bought the car salvaged with 52,000 miles on it and I thought it was a good deal. But as soon as 53,000 miles came on, it gave me the biggest headache ever. There was smoke coming out of the exhaust. When I say smoke, I donít mean little puffs, I mean tons and tons, even to the point where you canít see what's behind you. Now there is oil coming out the exhaust along with the smoke. The engine wonít go any higher than 3000 RPMís and it makes a hissing noise. Got any suggestions? The Toyota dealership said it was the turbos, but I donít believe them.

A: It sounds as if the dealer is telling it to you right. Your description of power loss and heavy smoke from the exhaust is a good indicator that one of the turboís oil seals has failed. The turbos have engine oil pumped to their bearings for lubrication and cooling. Because of their location if the oil seal for the bearing fails it will pump engine oil into the turbo housing. Usually the oil seal that fails is on the intake side of the turbo. This type of failure is reasonably easy to identify by the amount of oil found in the air tubes from the turbo to the intake manifold. That is where the easy part ends and the check book goes to work. Do not try running the engine with a failing turbo. The oil being pumped into the engine can damage the oxygen sensor, catalytic converter and possibly the engine if it should run out of oil. One last note, if you do have to replace one or both turbos, be sure to replace the oil feed lines. They are notorious for becoming restricted and choking the oil supply off to the turbo which equals early turbo failure.

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