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2004 Chevy Impala 3.4L

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New User

Aug 2, 2013, 6:48 AM

Post #1 of 4 (1138 views)
2004 Chevy Impala 3.4L Sign In

Hi all,

I recently purchased a 2004 Chevy Impala 3.4L base with 68k miles on it and I am having a problem with the acceleration and coolant level.

About every other time I start the vehicle, the car accelerates on its own, to the point where I am riding the brake when driving on a level road. When the car is engaged in park, it seems to be idling high. Also, when the car does accelerate on its own, I can hear a high-pitched whistling coming from the engine.

The coolant level has been under the cold mark for the last few days. I have added approx. 1.5-2 quarts of Dex-cool. Today it stayed at the cold line and did not require more fluid. I was alerted to the problem because I could hear liquid flowing sounds coming from the dash.

Any advice on what I should do? I have brought it back to the dealer and he has been willing to work with me, but he was not able to replicate the acceleration problem.
The dealer did tell me that the lower intake gasket had been replaced recently. I took apart the air intake and cleaned the throttle body and the IAC, but it hasn't helped.

Thanks for any advice.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 2, 2013, 6:55 AM

Post #2 of 4 (1131 views)
Re: 2004 Chevy Impala 3.4L Sign In

You need to look for vacuum leaks and verify the accuracy of the temp sensors


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

New User

Aug 2, 2013, 7:01 AM

Post #3 of 4 (1128 views)
Re: 2004 Chevy Impala 3.4L Sign In

Thanks for the advice!

Do you think a vacuum leak would cause an intermittent problem? Or would it cause a constant problem?

Thanks again, I really appreciate the advice.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 2, 2013, 8:56 AM

Post #4 of 4 (1115 views)
Re: 2004 Chevy Impala 3.4L Sign In

They can,


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