Question about 1991 Buick Park Avenue

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I have a 1991 buick park ave ultra

I commute 2 school everyday about 30 miles and everyday after about 20 miles on the same part of the freeway my spedometer will drop from around 65-70 mph to about 55 mph and wont accelerate and rpms wont go up for a couple mins and then it slowly speeds back up,what is the cause of this

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Your car is suffering from a faulty speed sensor. it works by using a signal generator in the transmission that creates an electrical signal in relationship to vehicle speed. This information is processed by the vehicle’s computer for engine and transmission management and provides the signal for the body computer that controls the speedometer. If the speed sensor itself fails then this might be the reason behind your problems. in addition, another cause of this may be that harness my be loose connecting to the transmission or behind the speedometer. there are multiple pins connecting behind the speedometer, and sometimes when one of those pins are not properly connected it gives a problem like yours.

Posted on Sep 15, 2008

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For the 1991 Buick Park Avenue:
Firing Orders & Cylinder layouts are the same. The difference is in the Ignition Coil Connections. I have included all three (3) types of Coil Systems for the Park Ave, Park Ave Ultra, and Park Ave with a Supercharger.

For ALL the 3.8L V6:
Firing Order:
1-6-5-4-3-2
Cylinders:
.......(back).......

|...1....3....5...|
________________
|...2....4....6...|
.......(front)

For the Type I Coil:
.........(back)
3--->o.|//////|
..........|\\\\\\|.o <---6
5--->o.|//////|
..........|\\\\\\|.o <---2
1--->o.|//////|
..........|\\\\\\|.o <---4
.........(front)

For the Rest of the Coils:
(back)
....6
....3
....2
....5
....4
....1
(front)

For this Type II Coil (Solid One UNIT):
(back)
_____
|....o| <---6
|O....|
|....o| <---3
|....o| <---2
|O....|
|....o| <---5
|....o| <---4
|O....|
|....o| <---1
(front)

For this Type Coil (3-Section UNITS):
(back)
______
|....o.| <---6
|O.....|
|....o.| <---3
_____
|....o.| <---2
|O.....|
|....o.| <---5
_____
|....o.| <---4
|O.....|
|....o.| <---1
(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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