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Has anyone run across specs of what the nominal vacume reading should be for the engine at idle. Just picked up a 76 280 with 200,000 + miles that has been neglected. Since the engine system requires a closed vacume....seems to me that comparing existing vacume reading with specified factory readings is a farily simple method of checking the condition of all those vacume lines and diagnosing. I have a Haynes and Clymer manual that tells me everything except what i'm looking for. Thanks,
Gary
 

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> Has anyone run across specs of what the
> nominal vacume reading should be for the
> engine at idle. Just picked up a 76 280 with
> 200,000 + miles that has been neglected.
> Since the engine system requires a closed
> vacume....seems to me that comparing
> existing vacume reading with specified
> factory readings is a farily simple method
> of checking the condition of all those
> vacume lines and diagnosing. I have a Haynes
> and Clymer manual that tells me everything
> except what i'm looking for. Thanks,
> Gary
the vacuum should hold a steady 17hg a little higher would be great as long as the needle is steady youll be in good shape.
 
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