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pssshhh sound when igntion key is turn to on position 200 1989

posted by  guYom on  Wed Jun 9 03:58 CST 2004
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last visit: Fri Jul 5 17:35 CST 2013
[RELATED]

Hello,

Just curious...

I have replaced my 561 ECU with a 951 -- both work fine.
However with the 951 I am now getting a 2 to 3 second pssshhh sound under the hood (air sound, something getting under pressure)when I turn my ignition key in the on position, before I even crank the engine.

What is this sound? How come I never got it with the 561 ECU?
Anything I should worry about?

Thanks.
--
'89 244DL M47 161K miles






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