04 Impala 3.4 Idle issues, please help me. - Chevy Impala Forums

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Old 07-24-2011, 04:42 PM   #1 (permalink)
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04 Impala 3.4 Idle issues, please help me.

My 2004 impala base 3.4 engine has about 101K miles on it and a new IAC motor replaced since the old one for some odd reason, was idling fast(about 1100 RPM) after driving on freeway with A/C running when at a stop and in park. The throttle body is cleaned, been tuned up (new A/C Delco (iridium) plugs and wires), fuel pressure regulator replaced due to seepage, and fuel filter replaced. I replaced the IAC valve with a BWD brand. After I shut off the car and then restart it after a few minutes, the idle speed would go back to normal. It happened yesterday after driving on the freeway at close to 70 mph for about 5 miles distance. What can cause this intermittent problem?

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Old 07-24-2011, 05:00 PM   #2 (permalink)
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sounds like the tps(throttle position sensor) is getting stuck. Sometimes it throws a code, but sometimes it doesn't. fairly cheap part and easy to replace. but id start there.

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Old 07-24-2011, 07:21 PM   #3 (permalink)
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yeah it might be the TPS, but the fact is, There is no Check engine light on.

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Old 07-24-2011, 07:25 PM   #4 (permalink)
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That's one choice, lets see the other choices of what other people might have to say about my car's issue. Because whenever money is the factor, we all need to make careful decisions.

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Old 07-24-2011, 07:29 PM   #5 (permalink)
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It only goes on if the voltage signal is incorrect. If it's not returning to 0% that what makes it idle high. If you have a live data scan you can check it. I know auto zone uses an actron scanner with live data. Go in and check it out. I had mine go out twice before. Once with mil on and one without.

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Port and Polish Intake Manifold
Custom K&N Cold Air Intake
MSD Ignition DIS-4 + MSD 8.5mm Wires
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3" Downpipe and u-bend delete with Flowmaster muffler
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Optima Red Top Battery
Cross drilled and slotted rotors + F-Body calipers coming soon
4t65HD Transmission = Freshly rebuilt 12/2011
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Old 07-25-2011, 07:06 AM   #6 (permalink)
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my MIL never came on. I might replace the TPS sensor later on and soon.

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Old 07-29-2013, 09:45 AM   #7 (permalink)
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fast idle

I have a 2002 Chevy impala and is doing same thing when u get on highway do about 65 or 70 mpg it stays at a idle that fast they replace 02 sensor and temperature control sensor and throttle still doing it and now is believed to be the computer.

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Old 07-29-2013, 09:46 AM   #8 (permalink)
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high idle

let me know what u find out

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Old 08-04-2013, 07:14 PM   #9 (permalink)
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Quote:
Originally Posted by Tonyman89 View Post
My 2004 impala base 3.4 engine has about 101K miles on it and a new IAC motor replaced since the old one for some odd reason, was idling fast(about 1100 RPM) after driving on freeway with A/C running when at a stop and in park. The throttle body is cleaned, been tuned up (new A/C Delco (iridium) plugs and wires), fuel pressure regulator replaced due to seepage, and fuel filter replaced. I replaced the IAC valve with a BWD brand. After I shut off the car and then restart it after a few minutes, the idle speed would go back to normal. It happened yesterday after driving on the freeway at close to 70 mph for about 5 miles distance. What can cause this intermittent problem?
you should always get the genuine GM Sensor. get the ac delco one. 1100 seems to high. mine idles at like 840-850 with the ac on. if you have a scanner it will tell you if the tps is stuck open

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Old 08-07-2013, 08:17 AM   #10 (permalink)
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May I ask what is a normal idle RPM for the LS? Mine seems to fluctuate between 600-1000. Unless I'm mistaken, it seems that when the motor is warm, its at the high end of the range; and on a cold start, it's at the low end. Idling isn't rough, so I don't really suspect there's any issues, but I'm just curious as to what a normal idle is.

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Old 08-09-2013, 02:41 AM   #11 (permalink)
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At cold start the rpm's should be higher (around 900-1000) after warm up (a couple minutes) it should drop to around 7-800 or so. If not, there is likely a MAF or IAC valve problem.

Note: Whenever you replace an electrical component (sensor, valve, etc) you should unhook the battery and turn your key to the "on" position. This resets the computer right away. Otherwise you must do a few driving sessions (usually 100mi or so) for the computer to relearn the new sensor or changes made.

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