no engine braking when car is at operational temps.

1998 GMC JIMMY
228,000 MILES
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DUNCAN123
  • MEMBER
  • 1 POST
When going down steep grades I shift from Odrive to 3rd,rpm jumps but car does not slow,on the brakes until the bottom of hill.Occasionally this has happened on level road,car speed creeps up when foot is off the gas,shifting down to lower gears does not slow car down,on the brakes to keep within the speed limit.Have not done any trouble shooting as I do not know where to start.All reg. maint. is up to date,car shifts normally at all times,throttle cable system is not binding,and operates smoothly.This does not happen when the car is cold.Any help would be appreciated.Thank you.
Apr 24, 2012 at 9:32 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,239 POSTS
If the hill is steep enough, the engine may not be able to slow you down. Keep in mind, there are a lot of miles on the engine. I'm sure the compression isn't what it once was.
Apr 24, 2012 at 11:03 AM
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