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Difficulty starting 900 1993

posted by  spook on  Fri Jul 17 11:28 CST 2009
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Vladimir,

May this find you well. If you car lives in a humid climate, condensation overnight could disrupt the crank sensor's signal, by shorting it. When the car warms up, the moisture evaporates, and the sensor works fine. Normally, though, once the sensor fails, no amount of cranking will help.

This sounds as if it could be a fuel related issue. The fuel pump check valve might allow pressure to bleed-off overnight. Once you crank it enough to restore pressure, the car starts. Check the pressure at the fuel rail. If memory serves, it should be about 43 pounds/square inch. There should be a Schader valve on the fuel rail, to which a pressure gauge can be applied.

Hope this helps.

Yours faithfully,

Spook






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