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Hey all,

I have a 2003 6litre 2500HD and I was doing some stuff and took the plastic intake piping off and noticed that the throttle butterfly isnt 100% shut (if you push it it will close more) and I was wondering if that was normal? I know from logs that when the car is at idle the TPS position averages from about 8-11%.

Thanks for your help.

Lee.
 

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The idle is set on the elec. throttlebody by the computer opening the throttle blade slightly. Its normal for them to be open a little when the motor is off. The cable throttlebodies had a IAC valve to adjust the idle until the engine warmed up. If you ever want to clean the throttlebody and open the blade you have to turn the key on, not start and then depress the gas pedal to open the throttlebody blade.
 

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for future reference if you have a electric TB do not force it to move in any direction. if you are cleaning it on the truck just turn the key on and have someone or something hold the gas pedal down and it will open for you.
 

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yes it is normal. I have taken mine out and cleaned it, while pushing it open and I have had no problems. Just wondering why z71 says not to?
 
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