Question about 1992 Buick LeSabre

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I'm having trouble when I put the car in drive it's going through it's gear progression slow and it's idiling high I'm thinking it may be the transmission fillter since I had the transmission replaced about a year ago any help you can give me will be great

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Check this first. On the transmission there should be a small vacuum line that goes all the way to the inlet plenum, check that both ends of this line are are connected securely and that the line has no holes in it. This vacuum line governs the rate at which the transmission moves from one gear to the next. When the engine is running slowly, just above idle, the throttle plate is all but closed and the car will shift through the gears pretty quickly as there is no load and plenty of vacuum. If on the other hand when the engine is racing under load, with the throttle plate fully open, there is little vacuum and the transmission holds in gear for very much longer before up shifting. If this vacuum line is disconnected or leaking the transmission will interpret this as the engine under load and will be very tardy in up shifting.

Posted on Sep 08, 2010

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Posted on Jan 02, 2017

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