Need help with loss of power while accelerating
Thread Starter
Instructor
Joined: Aug 2002
Posts: 220
Likes: 0
From: Boise ID
Need help with loss of power while accelerating
When I accelerate, my car seems to have reduced power from about 2,000 to 3,000 rpm.
It is very noticeable. It does not matter what gear I am in (it is an automatic). It does not matter if the traction control is on or off. It does not matter how far I am pushing the pedal as long as I am accelerating.
I have changed the plugs. I have installed new GMPP plug wires. I have installed a new fuel filter.
Does anyone have any ideas of what to check next?
It is very noticeable. It does not matter what gear I am in (it is an automatic). It does not matter if the traction control is on or off. It does not matter how far I am pushing the pedal as long as I am accelerating.
I have changed the plugs. I have installed new GMPP plug wires. I have installed a new fuel filter.
Does anyone have any ideas of what to check next?
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Is this with or without active handling on? If with it off, you may need to attach a fuel pressure gauge to the fuel rail and make sure the fuel pump is maintaining pressure throughout the full rpm range.
Eric D
Eric D
Original Founding Member!
Joined: Jul 1999
Posts: 9,037
Likes: 88
From: Granby, MA
Cruise-In 1, 3, 9. 10 & 11 Veteran
how many
how many miles on it. Are you sure it is only in that 2000-3000 power band or does it start at 2,000 and have no power all the way up. If that is the case, check your cats. They are notorious for this. You will feel like your pulling an anchor if they are really blocked, if only partially blocked it won't be that obvious. On mine they became hard and actually a chunk broke. I could hear it rolling around like a marble. It scared me half to death. Thought I had thrown a bearing or something.
The other thing you could do is either bring it to a tuner or a buddy who has a laptop and the software to monitor and record a run. Then if you or your friend know how to analyze it you can or send the report to a tuner. Or...even better, post it up in the forum tuner section...I am sure somebody can help you out.
The other thing you could do is either bring it to a tuner or a buddy who has a laptop and the software to monitor and record a run. Then if you or your friend know how to analyze it you can or send the report to a tuner. Or...even better, post it up in the forum tuner section...I am sure somebody can help you out.
Last edited by XtremeVette; Aug 4, 2008 at 02:19 PM.
Thread Starter
Instructor
Joined: Aug 2002
Posts: 220
Likes: 0
From: Boise ID
It is the same with active handling on or off. I have checked fuel pressure and it is good all the way through the rpm range. I have new cats on the car and it had this problem before and after the new exhaust. Any other suggestions?? Thanks!
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Melting Slicks
Joined: Mar 2006
Posts: 2,997
Likes: 36
From: Ocean Springs MS
Friends car is having similar problems, also an automatic, no codes showing. Already swapped the fuel filter, plugs and wires too and cleaned the air filter. Doesn't happen all the time only now and then. Really fell on it's face when ran it on a dyno. Any chance a ground problem might cause this? 
Last edited by rpm462; Aug 13, 2008 at 08:46 AM.