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Old 05-26-2011, 12:51 AM   Thread Starter #1
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Default Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Hey fellas, I got my spark plugs changed today, and while the intake piping was off, I went ahead and had the TB cleaned. We basically took a shop rag and wet it with TB cleaner, and wiped down the butterfly plate, and surrounding areas. It took off A LOT of gunk, and the TB looks clean and new once again.

But now the damn idle is way high...hovering around 1500 RPM in park (and fluctuates between 2000 and ~900 RPM), and when it's in gear, it'll hover around 1000 RPM.

I know there's a certain procedure to reset the idle control? Does anyone know the procedure? I tried disconnecting the battery for 15 minutes, but the problem still exists. Someone mentioned that I cannot touch the butteryfly plate (which we did when it was being cleaned). I posted this on the big org but I figured I'll get more response on here. Thanks in advance!
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Old 05-26-2011, 01:54 AM   #2
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Default Re: Changed spark plugs and cleaned TB, now engine idles high

Yeah u mess it up when u touch it with the rag. They are very sensitive. Someone will put the link for the idle reset.
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Old 05-26-2011, 02:06 AM   #3
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Here's how to do the idle relearn, it's kinda tricky to get it right, takes a couple times to get the timing down


1.Start engine and warm it up to normal operating temperature.
2.Turn ignition switch OFF and wait at least 10 seconds.
3.Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
4.Repeat the following procedure quickly five times within 5 seconds:
5.Fully depress the accelerator pedal.
6. Fully release the accelerator pedal.
7.Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
8.Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
9.Start engine and let it idle.
10. Wait 20 seconds.
11.Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications
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Old 05-26-2011, 02:24 AM   #4
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Default Re: Changed spark plugs and cleaned TB, now engine idles high

I try that and I couldn't get it
Right. I guess im to slow for that or some.
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Old 05-26-2011, 02:25 AM   #5
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Default Re: Changed spark plugs and cleaned TB, now engine idles high

if you moved the butterfly, you have to get a new one.
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Old 05-26-2011, 07:32 AM   #6
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Try idle relearn procedure. It works... just need to get the timing right on it.

If you continue to have high idle... then you messed the positioning of the butterfly which is controlled by the ECU and will read HIGH. Hopefully you didn't.
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Old 05-26-2011, 11:28 PM   Thread Starter #7
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

I did the idle reset procedure 3 times today, and the idle is now back to normal! I guess the 3rd time was the charm.

Thanks for the replies fellas.
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Old 05-27-2011, 09:21 AM   #8
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Got lucky! Dont do it again! lol
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Old 05-27-2011, 09:22 AM   #9
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Yeah most of the time you can do an idle air relearn. But it wont always work.
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Old 05-27-2011, 09:25 AM   #10
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Yea I made the same mistake cant touch that throttle.. I took it too the Dealer $100 later they Reset The computer and Relearned it. Brand new Again..

Last edited by KRod877; 05-27-2011 at 09:28 AM.
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Old 06-04-2011, 05:41 PM   #11
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

Greetings fellas....

I had the same situation when I replaced my spark plugs and cleaned the TB. My idle was way found high for few minutes. However at the same time I also broke my battery terminal and my car was down for about an hour or so. I replaced the battery terminal after an hour and engine idle came back to normal.

Don't know if it was ECU that was reseted and that caused idle to reset. I remember once when I had to reset my ECU then I had to wait about 4 hours to disconnect & connect battery terminal back.

Last edited by KevMaster; 06-04-2011 at 05:43 PM.
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Old 06-04-2011, 07:57 PM   #12
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

anytime you guys start cleaning the throttle body , disconnect the battery first,

this will solve 99% of your issues
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Old 06-04-2011, 08:49 PM   #13
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Default Re: Changed Spark Plugs And Cleaned TB, Now Engine Idles High

ima have to try this as well.....good info.
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