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lack of power on acceleration video

M

moparx12

New member
guys,

Take a look at this video. Do you recognize the problem? i dont know if i only have one issue or multiple ones, but one issue is under normal accel, the car will accelerate ok for a moment then around 2.5k lose power and the tach bounces some. The other problem is actually a whiney noise when the car downshifts on harder acceleration such as an on ramp.

I do have an engine light on, but i got it scanned and its a P0410, the secondary air intake system. I have been told that that would not likely cause the symptoms i am seeing.

VIDEO:
2011 09 28 20 28 38 937 - YouTube
 


another member mentioned pulling the o2 sensor out of the cat and replacing it with a plug to rule out a clogged cat. I plan to try that tomorrow. it revs in place just fine though, its only while driving that i have the problems.
 
That's because when it's sitting there there's no load on the engine...now try moving 3500 pounds and it doesn't like it so much.
 


i just had the cat changed at the dealer for free. Covered by GM. It solved the problem! what a relief.

Thanks Guys!
 
hmmm my car accelerates just like that, just did a tune up and it's better but still weak. how did you go about getting a free new cat?? lol
 
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