GMC Acadia Forum banner
21 - 21 of 21 Posts

·
Registered
Joined
·
2,301 Posts
As far as GM engines go, after owning some +35 GM vehicles I've never had an engine blow or even exhibit excessive oil use. The only engine issue I can recall was on a 1987 Pontiac Grand Am with manual 4 speed transmission. The engine would most days never come off high warm up idle. I would come to a traffic light even after driving 20 minutes and it would be at 1200 to 1400 RPM at idle.
Also, if it was summer and I used the cruise control while the A/C was on, the engine would often be at 1800 to 2400 RPM even if I disengaged the cruise. I had to pull off to the shoulder and then the RPM would drop down.

In both high idle situations, if I turned the engine off and restarted, then the engine would behave as it should for the rest of that drive.
It turned out to be an issue with the ECM programming and manual transmission.
 
  • Like
Reactions: 442dude
21 - 21 of 21 Posts
Top