What are your thoughts on this?

[Methodical]

I've read in several MM&FF issues (i.e. Ask Bernie/Yo Ken columns) over the years, even in the new issue and in other publications/forums that you can drill either a 1/8" or 1/4" hole in the throttle blade and that will help an unstable idle. However, I've never to date seen where anyone has been advised to do that on this forum. What do you think? Does it work or not? And if it does work, which year Mustang does it work on?

Peace

 

[HISSIN50]

It can make for an annoying whistle. That advice can be for foxes which really would benefit from an adjustable IAC plate.

Since SN's have the bleed adjuster (the allen-head fastener under a plastic/rubber grommet on the front of the IAC), I would use it instead. Foxes dont have this option stock (hence why the throttle blade is drilled).

Good luck.

 

[final5-0]

Well Al

To me it seems like a bunch of Poop

On the other hand ... I've seen peeps on these forums say it works.

Also seen peeps on these forums say ... It don't

My thoughts about this have always been .........

A small hole or the slightest bit more crack of the tb blade .............

Whats the difference
each method is gonna let a bit more air flow past the blade.

Besides

You and I both know the prob behind this whole deal is ............

the true amount of air flow
and
the air flow values in the pcm don't match
thus
freaking out the little silver box

Grady

 

[Black95GTS]

I've read in several MM&FF issues (i.e. Ask Bernie/Yo Ken columns) over the years, even in the new issue and in other publications/forums that you can drill either a 1/8" or 1/4" hole in the throttle blade and that will help an unstable idle. However, I've never to date seen where anyone has been advised to do that on this forum. What do you think? Does it work or not? And if it does work, which year Mustang does it work on?

Peace

I have seen this work on a 91 Fox. I got too because I really made fun of the kid for doing it. Then he fired it up and the thing idled like stock. I think it was an F cam.

I'm not sure how this would work with our EECs. Grady, wouldn't the MAF see the air if you drilled a hole in the tb?

I do agree though that drilling a hole should be the absolute LAST resort after you've tried everything. Clean the sensors, set the TB voltage, etc etc and if all else fails and you don't plan selling that T/B any time soon, then I would probly try drilling it.

Adam

 

[95Vert]

This is very interesting since I'm thinking of switching to a 93 TB set-up. I hope the guys with the swap chime in.

 

[Methodical]

I thought this was interesting and was thinking out loud. Yes Grady I agree as I use the Tweecer and EA to work on my idle. Again just was thinking out loud.

Peace

 

[final5-0]

I thought this was interesting and was thinking out loud. Yes Grady I agree as I use the Tweecer and EA to work on my idle. Again just was thinking out loud.

Peace

What do you think Al?

A tiny hole in the tb blade

OR

Very slight increase of tb blade opening with the stop screw

What is the difference

I just can't see how there would be any difference

Grady

 

[CManT1914]

What do you think Al?

A tiny hole in the tb blade

OR

Very slight increase of tb blade opening with the stop screw

What is the difference

I just can't see how there would be any difference

Grady

Well, when we turn the stop screw, the blade opens, and the TPS is changed as well. If he drills a hole, the TPS stays where it should. That would effect things.

 

[Black95GTS]

Well, when we turn the stop screw, the blade opens, and the TPS is changed as well. If he drills a hole, the TPS stays where it should. That would effect things.

Thats very interesting, I didn't think of it. Since you're just trying to get it to idle you don't want that TPS going anywhere if you can avoid it. Although, if you disconnected the battery after you did the drilling, wouldn't the computer learn that slight opening as "idle"?? Would you drill, then set the voltage?

Are we thinking too far into this?

Screw it all, I'm switching to carb.

- tuning with a flat head > tuning with a laptop

 

[Pokageek]

I am using the IAC plate I bought from a dude on this site. If that is what you are speaking of, it works.

 

[illwood]

Screw it all, I'm switching to carb.

- tuning with a flat head > tuning with a laptop

Can I have your TwEECer R/T then?

I am using the IAC plate I bought from a dude on this site. If that is what you are speaking of, it works.

No, they were talking about physically drilling a hole in the butterfly in the throttle body.

 

[Blackened302]

This is very interesting since I'm thinking of switching to a 93 TB set-up. I hope the guys with the swap chime in.

that's exactly what i was thinking. i say it's worth a shot.

 

[RIO5.0]

I have run 2 different Fox TBs and never had idle issues...once a full idle reset was done....I have an Accu 75 but haven't tried that one just yet...Gonna wait on that one til the next phase...

This is an 93 Cobra that came with the upper....has hole...Idled fine..This one was ported some and the blade polished..It whistled...you can see the taper in the entry compared to the Ex..

This 96 Explorer unit is what I currently run...Had the hole...Idles fine.

Accu 75...No hole..

 

[final5-0]

I have seen this work on a 91 Fox. I got too because I really made fun of the kid for doing it. Then he fired it up and the thing idled like stock. I think it was an F cam.

It is kinda hard to argue against something that works

I'm not sure how this would work with our EECs. Grady, wouldn't the MAF see the air if you drilled a hole in the tb?

Seems to me your reasoning is correct cause the maf has already metered the air by the time it gets to the tb

I do agree though that drilling a hole should be the absolute LAST resort after you've tried everything. Clean the sensors, set the TB voltage, etc etc and if all else fails and you don't plan selling that T/B any time soon, then I would probly try drilling it.

Adam

Grady

 

[final5-0]

Well, when we turn the stop screw, the blade opens, and the TPS is changed as well. If he drills a hole, the TPS stays where it should. That would effect things.

Right as Rain Mr. Chris

I just might have to start callin ya

Terry Tuner

Like Al said above ... I'm just thinkin out loud
but
The amount of change in the tps would not be that much
THEN AGAIN
If one had his tps set right on the verge of the maximum closed voltage,
using the stop screw could push the closed setting beyond the limit.

I still say ... just get it aroung .85 volts ... give or take a bit

All this fuss from all of us guys over a little hole

Having said that .................... I'll leave now

Grady

 

[CManT1914]

Thats very interesting, I didn't think of it. Since you're just trying to get it to idle you don't want that TPS going anywhere if you can avoid it. Although, if you disconnected the battery after you did the drilling, wouldn't the computer learn that slight opening as "idle"?? Would you drill, then set the voltage?

Are we thinking too far into this?

Screw it all, I'm switching to carb.

- tuning with a flat head > tuning with a laptop

Supposedly our PCM's baseline the TPS at startup, meaning they use whatever voltage it reads as the "idle" voltage. However....... MANY guys (myself included) have good results from setting their TPS back to .9volts or so if/when it gets out of whack. Disco'ing the battery will not effect the TPS reading, as it's a "hard part", meaning where it sits, is where it sits. It's gonna read "xxx" voltage before and after you disco the battery.

Right as Rain Mr. Chris

I just might have to start callin ya

Terry Tuner

Like Al said above ... I'm just thinkin out loud
but
The amount of change in the tps would not be that much
THEN AGAIN
If one had his tps set right on the verge of the maximum closed voltage,
using the stop screw could push the closed setting beyond the limit.

I still say ... just get it aroung .85 volts ... give or take a bit

All this fuss from all of us guys over a little hole

Having said that .................... I'll leave now

Grady

lol, Terry Tuner? You're gonna have to explain that one to me Gramps!

You're right, the slight change that one usually needs to change the idle does not generally move the TPS too much. But like you said, if it's already at .99volts or so, that "slight" change can throw everything out of whack. I wish I could get mine below 1.1volts, I need to take it back off and readjust it, instead of messing with the stop screw, but I'm lazy, lol.

Plus, my CEL came on yesterday for the first time since my h/c/i, so something's up. It only comes on at idle though, so knowing my luck, it's something to do with that BLASTED TPS!! (especially since I JUST adjusted it the other day, then BAM my CEL comes on)

 

[donkey_punch]

i have a hole drilled in my stock TB. once i had the cam and heads done, the lowest it would idle was 1200. and with the exhaust system i have, that's just too loud of an idle. lol so the gentlemen that did the swap for me drilled a small hole in the TB and got it down to about 1000, and it wouldn't bouce once it was warmed up.
once i got it home i played around with the idle adjustment screw and got it just under 1000 about 800-900. on cold starts it bounces around and will stall if left alone. i just hold the gas lightly so it doesn't bounce and stays steady. once it's warmed up it's fine.