1997 Pontiac Bonneville bonneville losing pressure

1997 PONTIAC BONNEVILLE
163,556 MILES • 3.8L • V6 • FWD • AUTOMATIC
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KDHUDSON
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  • 1 POST
I have a 97 Bonneville 3.8 se and over the past month when I start up the car the rpm would fluctuate then after a couple of mins the rpm would jump up maybe because of asensor which raises about to 3 rpm. After this the rpms usually remain above 1 rpm. After a while of driving ill notice that on straight way roads the car drives perfext but on inclined roads there is a significant drop in pressure and the car barely makes the hill. Also on straight way roads the car has harsh shifting in only first and second gesr. I ran a diagnostic test and got a p1870 code but could this also be due to a bad coil pack
May 14, 2014 at 7:15 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
p1870 is the transaxle component slipping probably needs a trans overhaul. also clean the throttle plate on both sides and iac hole with choke cleaner that may help your fluctuating idle.
May 14, 2014 at 7:52 AM
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