4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
08-25-2003, 09:36 AM
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4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
I ran across this in the June 2003 issue in Motor - supposed cure for Idle fluc and an unstable idle - There is a air bypass plug for the thottle plate - 2 plugs are avail - yellow and red
1/8" = yellow
red is for holes smaller than 1/8" -
Check the holes with a drill bit.
Part 12580749 = yellow
Part 12581011 = red
1/8" = yellow
red is for holes smaller than 1/8" -
Check the holes with a drill bit.
Part 12580749 = yellow
Part 12581011 = red
08-25-2003, 03:53 PM
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Re: 4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
yes Greg those are GM part number - Motor is a good mag to get for underhood "tech" service bullentins etc...
FYI the mag is free
Just give yourself a business name
FYI the mag is free
Just give yourself a business name
08-26-2003, 09:53 AM
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Re: 4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
i'm guessing the throttle plate is located near the throttle body..
08-26-2003, 05:47 PM
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Re: 4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
i have a 2002 Sierra w/5.3L it has a 9/64" hole. It has a jagged idle which the dealer says is perfectly normal. I don't get it. Since i am bigger than the 1/8" hole specified i guess it doesn't include me? Any other ideas?
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08-26-2003, 11:59 PM
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Re: 4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
So what does this do, change the size of the little hole in the TB plate? Is that the idle hole or something? What will this do, give the engine a little less air? How do you know which one to get and what's to prevent it from falling out and getting sucked intot he engine?
Jim
Jim
09-02-2003, 11:48 AM
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Re: 4.8 5.3 Idle Fluctuation - Hi Pedal Effort 1999 to 2002
Y2k - it is a plastic rivet - it plug the hole - stablizing the idle according to the SIB - You put it in pull it thru and snip off the excess - help this helps
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