Question about 1998 Volvo S70

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1998 S70 TDI hesitancy and smoke above 60

If I am doing over 60 and then back off, the car then will not accelerate for a few seconds. Then, with a judder and belch of smoke it will continue. It does not do this at low speeds but as I do a lot of motorway driving then its something I probably need doing...

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  • 52 Answers

Good Morning,
There may be more than one problem but this is what I think about what I read so far.
When traveling at highway speeds and one takes his foot off of the accelerator the throttle plate in the "carburetor" or in the case of Fuel injection the "air metering body" closes and Vacuum in the intake manifold is increased greatly. In an older car with some miles on it this vacuum can **** oil out of the head past the valve stem seals and into the combustion chamber where it burns with the gas and creates smoke. The more oil the more smoke. When you want to accelerate again the engine is trying to cope with an oil rich mixture in the combustion chamber that it was not designed to cope with, and it complains to say the least.
Glad to be of Assistance - please rate the solution - I can learn from your rating. Thank you

Posted on Oct 27, 2008

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