Question about 2001 Chevrolet Monte Carlo

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My car is really slow to accelerate after I put a tank of ethonal gas in it. It runs fine after reaching 35 or so mph. Does not act slow all the time either. We have checked the low gears in transmission and they are fine. New fuel filter installed 17,000 miles ago. Our local mechanic thought it was throttle position sensor but not sure. It has not tripped any codes, no lights on on the dash and or message cdenter.

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  • 66 Answers

The cat. converter may be bad.

Posted on Jun 04, 2010

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on the off chance check the condition of the cat converter as it may be blocking the exhaust and acting as an exhaust brake above certain speeds
run the fault codes as well to check for other sensor problems

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Only thing I can is do you have a check engine light. If you do what is the code. Many auto parts stores will read your code for free.
What you said picks up slowly and tops out at 35 mph. My Chrysler 200 took 2 block to get to 2000 rpm 30 mph. That was all it would do. I had a code and changed the throttle body sending unit. The throttle body and sending unit are 1 piece unit on my car. some cars you can change just the sending unit. It improved 75 percent and when we changed gas station 3 weeks later the problem went away. With the limited info you gave that is all I got. Hope it helps.

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I am having the same problem but it only happens to me when the car engine is cold. This does not happen when the car has been on for a while. My solution is that I warm up the car for about 20 minutes before driving and my car works fine.

Added to my problem, when I press the gas, it asks like it's choking and I have to press through it, flooring the gas, to which it accelerates too much. It's ok when no in traffic. Also, when I stop the car idles really low and acts like it wants to shut off.

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Perhaps a trouble code scan would be beneficial, so that you get the right part the first time. Could be a few things, so why gamble, spend $20-$30 have it scanned, and possibly save $100's

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1 Answer

Ethonal Fuel.... I Need Help


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