Junk yard Throttle body

The 2nd Gen Board is for general questions regarding the second generation of Neons (2000 - current.) Rumors, hints, tips-and- tricks, and all general maintenance and repair questions belong in this forum, as well as beginning modification queries.
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HottRodd
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Junk yard Throttle body

Post by HottRodd » Fri Mar 16, 2018 9:16 am

Hey there went to the U-pull yesterday and got a throttle body for the IAC and TPS (cheap ) . So I decided for laughs I would try to see if drilling a hole in the Butterfly would alleviate the load (rough idle) my car suffers when I turn on the AC . So I disassembled it cleaned it , and as I was putting it back together for the test I noticed that the butterfly doesn't fit snuggly in the hole and if I hold it up to the light I can can see light all around it. Is this normal ? I find it shocking . I am used to metal ones that fit tight in all my old cars.
https://photos.app.goo.gl/78yCESHl6QnxCH8B3
I look at that and wonder how it is the car gets an accurate measure for a stable idle . Are there any ATX throttle bodies for this car that had a metal throttle body with a metal butterfly. Sort of makes me less concerned about drilling a hole in it to slightly increase the idle rpm's.
The 2003 2.0sx guy, 30k original miles :dance:
30k is that possible, Yeah :good: :

JeremyJ
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Location: Western WA

Re: Junk yard Throttle body

Post by JeremyJ » Fri Mar 16, 2018 9:38 am

All second gen TBs had plastic butterflies, as far as I know. Also, I know of at least one instance of someone drilling a small hole in the butterfly to alleviate a rough idle. If I were you, I'd start really tiny and work my way up. I think he was using an aftermarket 60mm, but the effect should carry over.
2002 Neon base -> 2005 SRT-4 ACR -> 1996 Dodge Neon sedan -> 1999 R/T Coupe -> 2002 R/T -> 2003 SRT-4

Build Thread: https://forum.2gn.org/viewtopic.php?f=51&t=69296

occasional demons
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Re: Junk yard Throttle body

Post by occasional demons » Fri Mar 16, 2018 11:29 am

All TB's should have a slight air gap between the throttle plate and the bore. Otherwise the plate can stick in the bore. It should be as minimal as possible, but it shouldn't block out any light around the edges.

If it is a bigger than a sheet of paper gap, someone may have messed with the throttle stop screw.

At rest, as long as the TPS voltage is ~0.6 volt, it should be okay. If the TPS voltage is too high at rest, you're going to have hanging high idle problems.
- Bill

desmodromic wrote:You have to remember what's important here, while they make New humans everyday, they'll never make another Neon.
Skellibert wrote: Fri Oct 13, 2017 3:42 amThis is a daily by the way, not a track car or fun buggy.

HottRodd
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Location: Brossard, Quebec, Canada

Re: Junk yard Throttle body

Post by HottRodd » Sun Mar 18, 2018 11:36 am

When I was at the JY I noticed the 2000 Chysler neon had a different IAC . Very close in dimensions but it had many more wires in the connector. Does this mean that it's degree of control is better or is it just design ?
That throttle body on the 2000 model is it a better design than the plastic 2003-2005 models ?
If it is could I get it to fit my 2003 model , or does it need the PCM because of the IAC difference?

Oh right. .. is there any way to put the 2003 IAC on the 2000 throttle body?

Update I found sebring good thread on this in this Org

viewtopic.php?f=40&t=419439&p=3538507&h ... l#p3538507

viewtopic.php?f=1&t=417675&p=3519872&hi ... l#p3519872
I suppose cutting the elbow of and grinding the surface straight is possible to use the 2003 IAC .
In the end unless you want to over size the TB , it is not worth the effort ? Or is there a benifits to using the metal TB (more accurate readings in the system).
The 2003 2.0sx guy, 30k original miles :dance:
30k is that possible, Yeah :good: :

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NickKo
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Re: Junk yard Throttle body

Post by NickKo » Sun Mar 18, 2018 4:43 pm

HottRodd wrote: Sun Mar 18, 2018 11:36 am When I was at the JY I noticed the 2000 Chysler neon had a different IAC . Very close in dimensions but it had many more wires in the connector. Does this mean that it's degree of control is better or is it just design ?
That throttle body on the 2000 model is it a better design than the plastic 2003-2005 models ?
If it is could I get it to fit my 2003 model , or does it need the PCM because of the IAC difference?

Oh right. .. is there any way to put the 2003 IAC on the 2000 throttle body?

Update I found sebring good thread on this in this Org

viewtopic.php?f=40&t=419439&p=3538507&h ... l#p3538507

viewtopic.php?f=1&t=417675&p=3519872&hi ... l#p3519872
I suppose cutting the elbow of and grinding the surface straight is possible to use the 2003 IAC .
In the end unless you want to over size the TB , it is not worth the effort ? Or is there a benifits to using the metal TB (more accurate readings in the system).
The 2000 Model year, was the last year to use the 4-wire IAC, as used in the 1st gen Neons.

For the purpose of simplicity, and not over-complicating things, I will recommend just staying with the 2002-2005 throttle body on a 2003 model year.
Changing the PCM, to run the 4-wire IAC, is *NOT* practical, because the wiring harness would have to be changed; and that is NOT advisable. (MAP sensors were different on the older models; plus there is NO place to unplug that part of harness, from the rest of the body harness. Not worth the trouble.)
Oh, and then you'd also have to deal with reprogramming the SKIM...... :nea:

- Nick
-1998 2-dr SOHC MTX= 52mm TB; Maddog STS
-1999 4-dr DOHC ATX= went to car heaven (junkyard)
-2000 Ply.LX with MTX = Maddog STS; CAI; R/T muffler + Header
-2001 Ddg.ES ATX = UDP, Magnum Header; + Syked PCM 'pending'

-1971 Ply.Scamp SL6cyl. ('Horse Traded' away)
-1968 Chry.300 w/440 V8 (sold)
"MoPar or No Car"

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