What is your RPM's at idle? - Chevrolet Forum - Chevy Enthusiasts Forums

What is your RPM's at idle?


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Join Date: Nov 2010
Posts: 74
East Bay, California

January 9th, 2011, 9:18 PM   #1  
CF Junior Member
What is your RPM's at idle?

I have a 2005 Chevy Silverado 5.3 and my idle RPM is about 500. Is this about right? Seems as if its sort of low....

 
Join Date: Nov 2010
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January 9th, 2011, 10:06 PM   #2  
CF Junior Member
It is pretty low. IACV and TB may need cleaning.

Mine starts at about 1.2-1.3k and drops to about 800-900 as it warms up.

 
Join Date: Nov 2010
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East Bay, California

January 9th, 2011, 10:45 PM   #3  
CF Junior Member
Alright Idle Air Control Valve I got but whats the TB? Ive replaced by myself an IACV on a crown victoria but where is ours located? And what would I clean it with?

 
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January 9th, 2011, 11:07 PM   #4  
CF Junior Member
TB is throttle body. Between the intake tube and on top of the intake manifold. The IACV is actually connected to it, so if you find one, you found the other.

Lazy/quick way:
Spray catalytic converter safe carb/throttle body cleaner into the TB, paying particular attention to the port leading to the IACV, while the engine is running. Either go really slow, or have someone else inside the truck revving it slightly to keep it alive.

Recommended way:
#1. Disconnect the intake tube, throttle linkage, IACV and TPS sensor
#2. Unbolt and lift throttle body off of the intake
#3. Unbolt the IACV from the throttle body
#4. Spray the hell out of the throttle body, wiping the carbon off as you go. (There will be alot below the butterfly!) (Be careful and do not spray the TPS)
#5. Spray the IACV port out and use a q tip to scrub the carbon in there.
#6. Once it is completely clean, set it to the side.
#7. Take the IACV and spray the little piston thingy. Scrub it with an old toothbrush or nail brush. Only clean the piston, do not spray into the IACV. In fact, hold it sensor up, piston down, so that it doesn't drip into the sensor.
#8. Replace O ring if damaged or worn.
#9. Once dry, put IACV back into throttle body. (Make sure it goes in straight! I installed my crooked causing a very high idle, so I had to start over)
#10. Tighten bolts, but not to tight. (I made this mistake to and broke one off. Required drilling, retapping, and new bolts.)
#11. Reinstall throttle body back onto manifold. (Check your gasket, or just replace it anyway) Install bolts, sensors, throttle linkage, intake tube.
#12. Turn key to ON for 20 seconds, then off for 10 seconds. (Computer repositions the IACV piston)
#13. Start engine and check for proper idle.

 
Join Date: Nov 2010
Posts: 74
East Bay, California

January 9th, 2011, 11:58 PM   #5  
CF Junior Member
Thats friggin fantastic. Love things I can do to improve the truck without costing $$$.

Do you happen to have any pictures either of the engine showing the part of of the part itself?

Like I said Ive replaced one on a crown vic, I seem to remember it being a pretty straight forward procedure.

 
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January 10th, 2011, 8:05 AM   #6  
CF Active Member
500 RPM sounds about right to me. On a warm engine that is.

 
Join Date: Nov 2010
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East Bay, California

January 10th, 2011, 2:14 PM   #7  
CF Junior Member
Alright, I mean I never really payed to much attention to any previous vehicles rpm idle & until I noticed I felt this one was a little low I never gave it twice a thought.

 
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East Bay, California

January 10th, 2011, 2:17 PM   #8  
CF Junior Member
Wmiller, so I should have the truck running while I use the cleaner? I looked up some video's on youtube with people using brushes and clothes to clean the carbon off. Manually moving the piece on the inside..... is this a safe practice on our trucks?

 
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January 10th, 2011, 3:21 PM   #9  
CF Active Member
I'll double check when I go home tonight, but pretty sure 500 rpm is is where my original motor was and my replacement that has only 500 miles on it.


Last edited by tsduke; January 10th, 2011 at 3:36 PM.
 
Join Date: Nov 2010
Posts: 74
East Bay, California

January 10th, 2011, 4:39 PM   #10  
CF Junior Member
Hey thanks I'd appreciate that. Sounds like 500 is not to far off from where it should be.. On a side note, why'd you need to replace your engine & what'd that cost ya?

 
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