Cleaning Tb ?
Thread Starter
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Cargo Master
Joined: Dec 2006
Posts: 3,489
Likes: 45
From: Central NY
Cleaning Tb ?
Should I bother? Was cleaning the MAF and Intake tube and noticed behind the TB plate it is black almost sludgy.
Idles and runs great. Decided to clean MAF as PM.
Afraid of breaking that crap free
Idles and runs great. Decided to clean MAF as PM.
Afraid of breaking that crap free
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
If your not going to take it off to clean why would you wash all the crap down into the engine? Your picture shows a pretty clean metered orifice hole in the throttle plate and you say it runs fine, so I wouldn't even bother. If the engine is warm and you use a heat gun or hair dryer to warm plastic parts before removing them they don't normally break.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Why worry about the area behind the plate as long as it not showing a plate stop ridge of varnish?
The throttle plate 'stop' is set to prevent the plate from going fully closed because amount of air going by The plate is part of the Idle calibration and Dynamics.
If the plate were allowed to fully close on a hot engine, then it cools, you could not operate the throttle because the plate would have been stuck with the throttle body shrinking around it after cooling down.
On a fault free system, removing the IAC electrical plug drops the idle to BASE idle, not a stall point.
The difference should be 250 rpm +/- a small amount.
The system has to have an air supply tolerance to work with.
It's been that way with carburation a 100 years and from 1985 on Ford fuel injection systems. They both need an idle stop to keep the plate from fully closing.
Good luck.
The throttle plate 'stop' is set to prevent the plate from going fully closed because amount of air going by The plate is part of the Idle calibration and Dynamics.
If the plate were allowed to fully close on a hot engine, then it cools, you could not operate the throttle because the plate would have been stuck with the throttle body shrinking around it after cooling down.
On a fault free system, removing the IAC electrical plug drops the idle to BASE idle, not a stall point.
The difference should be 250 rpm +/- a small amount.
The system has to have an air supply tolerance to work with.
It's been that way with carburation a 100 years and from 1985 on Ford fuel injection systems. They both need an idle stop to keep the plate from fully closing.
Good luck.
Thread Starter
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Cargo Master
Joined: Dec 2006
Posts: 3,489
Likes: 45
From: Central NY
Thank you both.
Leaving it alone since she runs great.
I figured I would ask since dealers, BG vendors and so many others use their spray systems.
Buttoning her up today. Thanks again.
Leaving it alone since she runs great.
I figured I would ask since dealers, BG vendors and so many others use their spray systems.
Buttoning her up today. Thanks again.
Freshman User
Joined: Nov 2017
Posts: 34
Likes: 0
Great info!
Why worry about the area behind the plate as long as it not showing a plate stop ridge of varnish?
The throttle plate 'stop' is set to prevent the plate from going fully closed because amount of air going by The plate is part of the Idle calibration and Dynamics.
If the plate were allowed to fully close on a hot engine, then it cools, you could not operate the throttle because the plate would have been stuck with the throttle body shrinking around it after cooling down.
On a fault free system, removing the IAC electrical plug drops the idle to BASE idle, not a stall point.
The difference should be 250 rpm +/- a small amount.
The system has to have an air supply tolerance to work with.
It's been that way with carburation a 100 years and from 1985 on Ford fuel injection systems. They both need an idle stop to keep the plate from fully closing.
Good luck.
The throttle plate 'stop' is set to prevent the plate from going fully closed because amount of air going by The plate is part of the Idle calibration and Dynamics.
If the plate were allowed to fully close on a hot engine, then it cools, you could not operate the throttle because the plate would have been stuck with the throttle body shrinking around it after cooling down.
On a fault free system, removing the IAC electrical plug drops the idle to BASE idle, not a stall point.
The difference should be 250 rpm +/- a small amount.
The system has to have an air supply tolerance to work with.
It's been that way with carburation a 100 years and from 1985 on Ford fuel injection systems. They both need an idle stop to keep the plate from fully closing.
Good luck.
I wish other vehicle forums could follow this example and not allow smart-alecs to ridicule someone needing help.
Thread Starter
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Cargo Master
Joined: Dec 2006
Posts: 3,489
Likes: 45
From: Central NY
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Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
yeah if it running great, why mess with it.
IF.....one was wanting to clean the back side of that throttle plate. I suggest removing the whole throttle body housing ( not just the throttle body). This way one reveals to the 2 interior EGR ports farther down stream the down turn of housing, which can get carboned up too. , Lime1GT makes a good point, so with whole housing off , your then not washing all that gunk down into the engine. Also the IAC comes off with it allowing easier access to it for cleaning and or replacement.
IF.....one was wanting to clean the back side of that throttle plate. I suggest removing the whole throttle body housing ( not just the throttle body). This way one reveals to the 2 interior EGR ports farther down stream the down turn of housing, which can get carboned up too. , Lime1GT makes a good point, so with whole housing off , your then not washing all that gunk down into the engine. Also the IAC comes off with it allowing easier access to it for cleaning and or replacement.
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Thread Starter
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Cargo Master
Joined: Dec 2006
Posts: 3,489
Likes: 45
From: Central NY
I recently replaced my 18 year old MAF, and didn't notice it's full improvement until I reset the engine computer. Might want to try it.
https://www.youtube.com/watch?time_c...&v=hZAsoqmqhdM
https://www.youtube.com/watch?time_c...&v=hZAsoqmqhdM
Is that the case????
TITA
Freshman User
Joined: Nov 2017
Posts: 34
Likes: 0
yeah if it running great, why mess with it.
IF.....one was wanting to clean the back side of that throttle plate. I suggest removing the whole throttle body housing ( not just the throttle body). This way one reveals to the 2 interior EGR ports farther down stream the down turn of housing, which can get carboned up too. , Lime1GT makes a good point, so with whole housing off , your then not washing all that gunk down into the engine. Also the IAC comes off with it allowing easier access to it for cleaning and or replacement.
IF.....one was wanting to clean the back side of that throttle plate. I suggest removing the whole throttle body housing ( not just the throttle body). This way one reveals to the 2 interior EGR ports farther down stream the down turn of housing, which can get carboned up too. , Lime1GT makes a good point, so with whole housing off , your then not washing all that gunk down into the engine. Also the IAC comes off with it allowing easier access to it for cleaning and or replacement.
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