"Correct Throttle Hang" Mod

[Cougar0102]

Hi. Can someone explain this in better detail - what it does, is it bad for my car, does it work on ATX?

Thanks,
Bryan

[uRiDiAN]

it makes the rpm's drop at a semi-normal rate when you rev or shift, rather than just chilling out and not dropping too quickly.

although, i have a question, too... since installing the SVT UIM, TB, and accordian pipe, i've been kinda afraid to put the throttle hang fix back in. the reason being, is that the air bypass hose doesn't have any 90° bends, let alone 3. but instead it's got 2 semi gentle bends. i'm just a little afraid of the possibility of sucking a little copper cap into my engine... can anyone dispell this fear?

uRiDiAN

[DanG]

Uridian: I would not install it at all. Read below.

Bryan: It's simple- This "fix" is a method by which you cause the engine's RPMs to come down sooner than normal by robbing the engine of its only available source of air (the idle-air control valve) when you let off the throttle.

I've made several posts to the boards explaining what happens to your Duratec when this "fix" is performed- They for some reason are not available using the Search feature. Perhaps Trevor can shed some light?

The Duratec is made with an IACV. The IACV has a purpose. Removing or degrading its effectivness alters and affects your engine both short and long term. Engines without IACVs have throttle plates that do not close as completely as ours does when throttle is let off. The Duratec closes its throttle plate all of the way because it knows it has an alternate source of air to help bring the engine down from whereever it was when throttle was removed. If the engine's Plan B is removed, it resorts to Plan C: Sucking oil & crankcase vapors into the combustion chamber past the valves and rings in an effort to fill the cylinders on the intake stroke. Without an air source, a vacuum is created, and nature abhores a vacuum. So oil sucks in through the PCV valve, valve seals, and rings. The result is a fouled intake (when we already have a fouling problem to begin with), and worn rings, seals, and seats.

Some "fix".

[Cougar0102]

Well I went ahead and did it - the Throttle Hang Fix. I see no difference in how the car rides - RPMs seem to come down about the same. Does it take a while to take effect? If not, i don't see why this is such a praised mod.

[Crispy]

I have an ATX.... I did it a while back.... it was in my car for about 24 hours and hated it... it completely robbed my car of all its power... I absolutely believe everything that Dan just posted... infact on the ride home from work I thought my car was about to stall several times.. I made it home ripped it out in 2 seconds and was ecstatic that all my power was back.... as far as you saying that you can't tell anything -- you should be feeling a decrease in power....

THIS mod will NEVER EVER be endorsed by me.....

[Cougar0102]

Yeh - I think I'm gonna take it out tonight... Doesn't seem that great.

[Frank]

Besides... who cares about throttle hang with an automatic? The ATX's computer cuts fuel during shifts anyway.

[Kinger]

Amen DanG!! Your the man!

[FastCougar]

OK, here is where Dan and I differ in opinion ... doesn't happen often, so bookmark this thread ;)

Everything that Dan said is true, but you are forgetting that we are not completely blocking the IACV, only reducing it's passage area from say 10mm down to 3mm-4mm. Fully restricting the IACV would cause the car to die, but stumble before doing so. This stumbling is when the engine is looking to impliment "Plan C: Sucking oil & crankcase vapors into the combustion chamber past the valves and rings in an effort to fill the cylinders on the intake stroke." This can very easily be demonstrated by pinching the IACV Bypass Tube between the intake tube and the IACV.

In case everyone has forgotten, this mod was the brainchild of Ray McNarry (R.I.P.), who knew what he was doing. I too had reservations about doing it, but when my car started hanging badly, actually increasing revs about 200-400 RPMs when backing off the throttle, I decide it was time to look for alternatives. Besides, it takes all of 2 minutes to take out if you don't like the effect it has on your car. Ultimately, the culprit is the IACV.

[ignernt]

Trevor,

Is this the same valve that surges at idle on cold mornings and makes that gawd-awful humming noise? If so, is this fix a quick remedy? I bought my cougar on Labor Day, and have only noticed this buzz the past two weeks while the mornings have been a little cold. In fact, I took the car back to the dealer today, and they replaced an O2 sensor. I guess I'll see if it makes any difference tomorrow morning.

Thanks & have a good holiday.

[Cougar0102]

I did it! I jarred that Satanic piece of metal out of my beloved cat and sent it back to the depths of hell from whence it came (....eh, exaggerating...).

Crispy - I think you're right - my car does feel more powerful without it, i just never noticed the loss while it was on I guess. I dunno. If there was any gain involved in having it, it didnt seem significant enough to take advantage of. It was worth a try, and gave me something to do on my boring day off school =)

Thanks for all the help,
Bryan

[sndxrnd21mb]

its kind of strange what everyone is saying becuase after i put mine in the rpm's came down much quicker, and i had much more low end torque. but it sux in the cold weather because my car starts hard or just wont start. right now im working on a modification to have a solenoid inline with the IAC tube so you can turn it off to let the air through on start up and close after warm up.

[Dopeshiet7]

I did the throttle hang fix too and I love it. I doubt it helps any of you ATX'ers but the whole fact that my RPM drop quicker aids my driving. The only problem is my car stalled twice when I had my AC on but that's no biggie. I once took the metal piece out just to see the difference, if any, and there is a huge difference in my car. When I took it off it seemed like someone was holding the gas pedal after I let my foot off. This mod may not be for everyone but it's definately for me:)

[PuckPuck]

i'm gonna go with trevor....

my beleif the IACV is too agressive on our cars... what the throttle hang fix does it makes it less agressive by restricting it, but not completely... if you look the revs don't instantly drop... they still come down just much quicker with the fix in... you can actually play around with the size of the hole and the positioning of it by making the hole off center... if you look the pipe has a few bends in it.. the air flow will follow these bends and putting the cap so the hole is more on the outside of this last corner you'll get more air in