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 No downshift at freeway speeds (1995 buick riviera supercharged)

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riviera559
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riviera559


Name : FresnoRiviera
Joined : 2012-03-09
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No downshift at freeway speeds (1995 buick riviera supercharged) Empty
PostSubject: No downshift at freeway speeds (1995 buick riviera supercharged)   No downshift at freeway speeds (1995 buick riviera supercharged) EmptyFri Mar 09, 2012 10:46 pm

When i am driving at freeway speeds and floor it to pass up a car my car does not downshift to third . at first i thought it was but when i pull the shift lever down into third from drive i feel the difference.. i did have a new pcm installed and programmed . could there of have been a programming mistake or can it be from a faulty vaccum line. ANY SUGGESTINGS WOULD HELP. i also barely had a head gasket job done .. 1995 buick supercharged 131,000 miles.
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robotennis61
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robotennis61


Name : robotennis
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No downshift at freeway speeds (1995 buick riviera supercharged) Empty
PostSubject: Re: No downshift at freeway speeds (1995 buick riviera supercharged)   No downshift at freeway speeds (1995 buick riviera supercharged) EmptyFri Mar 09, 2012 10:57 pm

I know, shit from shinola when it comes to mechanicals but have you replaced your vacum modulator?
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No downshift at freeway speeds (1995 buick riviera supercharged)
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