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2000 Buick Park Avenue RPM drop when holding steady speed

Tiny
DESMOINES08
  • MEMBER
  • 2000 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I have had this issue for a little while now. The auto would accelerate without any issues, but once I have reach a certain speed and mantain it for a few seconds the RPM drop by about 400. So I am holding the pedal steady to keep the auto at the speed, the RPMs drop by 400 or so and then if I press the pedal down the car is struggling to do so, then after a few seconds of struggling it starts to accelerate. If I am in the same situation, but this time I let go of the pedal a little and then press it again then the auto accelerates without any issues. This happens at any given speed it seems like, but only if I maintain one speed. While accelerating it does not happen.
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Thursday, March 13th, 2008 AT 12:26 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure and the throttle position sensor-
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Thursday, March 13th, 2008 AT 12:41 PM
Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
You should also monitor the TCC lock-up and duty cycle on a scantool. Make sure it isn't a torque converter problem.
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Friday, March 14th, 2008 AT 9:58 PM

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