Poor acceleration

2007 GMC ACADIA
146,000 MILES • 3.6L • V6 • 2WD • AUTOMATIC
Avatar
ANGELLAVIGNE
  • MEMBER
  • 2 POSTS
I have the vehicle listed above slt-2. Lately I’ve been having trouble getting it to accelerate. I just had a brand new transmission put in in June and this problem seems a little different. It seems to take a little longer to kick in. Except when I’m going up a hill, then it accelerates perfectly. What could make this happen? I noticed most people have the opposite problem, they have trouble accelerating going uphill.
Dec 13, 2019 at 3:56 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Are there any rattling sounds from under the vehicle? It almost sounds like the internals in the catalytic converter are blocking air flow but when you go up hill, it moves and allows proper flow. Also, is the check engine light staying on when the engine is running?

Let me know.
Joe
Dec 13, 2019 at 9:10 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.