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Old 04-28-2012, 01:03 PM   #276
02gtvertible
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Re: Hanging/Slow dropping RPM FIX inside.

does anyone have this on video? some revs with and without?
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Old 04-29-2012, 11:29 AM   #277
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Re: Hanging/Slow dropping RPM FIX inside.

Quote:
Originally Posted by 02gtvertible View Post
does anyone have this on video? some revs with and without?
I'll try to make a video this afternoon.
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Old 04-29-2012, 12:52 PM   #278
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Re: Hanging/Slow dropping RPM FIX inside.

Quote:
Originally Posted by 02gtvertible View Post
does anyone have this on video? some revs with and without?
Here you go, I am bringing the revs up to around 2k then letting off:


Revs WITHOUT IAC valve restrictor plate:

http://www.youtube.com/watch?v=s-_AL...ature=youtu.be


Revs WITH IAC valve restrictor plate:

http://www.youtube.com/watch?v=PsvLT...ature=youtu.be
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Old 04-29-2012, 06:13 PM   #279
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Re: Hanging/Slow dropping RPM FIX inside.

I'm using the NC plate and still get a hanging idle 50% of the time at around 1400, takes more than a few seconds to drop to normal when it does. Is there a real fix for this? My last Mach got the plate and it just worked great, idle dropped fast & hard. tThis one still seems to float even when it drops.

Thanks.
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Old 05-03-2012, 04:03 PM   #280
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Re: Hanging/Slow dropping RPM FIX inside.

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Originally Posted by jjm525 View Post
I'm using the NC plate and still get a hanging idle 50% of the time at around 1400, takes more than a few seconds to drop to normal when it does. Is there a real fix for this? My last Mach got the plate and it just worked great, idle dropped fast & hard. tThis one still seems to float even when it drops.

Thanks.
Keep trying a smaller hole would be my advice. You might even have to go to just one hole instead of two like I did.
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Old 05-06-2012, 12:11 PM   #281
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Re: Hanging/Slow dropping RPM FIX inside.

My mach has this same problem. Ill be driving and then Ill come to a stop and the RPMs will be at 1500, almost 2000 in some cases, and then after sitting there for maybe 4-5 seconds it drops down to like 600 and almost wants to die. Will the NC plate help?
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Old 05-10-2012, 06:18 AM   #282
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Re: Hanging/Slow dropping RPM FIX inside.

No.

The restrictor plate is not made to fix idling problems.

It is made to force the rpms to drop faster.
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Old 05-22-2012, 08:34 AM   #283
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Re: Hanging/Slow dropping RPM FIX inside.

Just came back to this thread after several years ...

I used to sell these for $4-5 back in the day ... (2005 and prior)
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Old 06-28-2012, 10:27 AM   #284
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Re: Hanging/Slow dropping RPM FIX inside.

Hello. Would the ristrictor plate have any benifit with my auto transmission or it works only for 5 speed trans that have the rpm problem?

Thanks.......
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Old 07-26-2012, 07:14 PM   #285
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Re: Hanging/Slow dropping RPM FIX inside.

Thank you for the info on the hanging rpm's!I can't wait to get to it.
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Old 08-28-2012, 07:33 PM   #286
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Re: Hanging/Slow dropping RPM FIX inside.

Thanks so much for this fix! Took literally 45 minutes with this piece of scrap tin i had laying around. Drilled a 7/8 big hole and 5/16 "restricted" hole. Instantly noticed a difference upon test drive. Rpms drop like my last notchback did. Kudos!!
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Old 09-05-2012, 12:41 PM   #287
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Redoing The Fix?

I did the fix for the hanging RPM problem on my '03 and it worked great. Not too long after, I put the Diablosport Predator on it and had no issues. A few months ago, I got some bad gas (we think) and pulled the tune off to help with the detonation. The RPMs hang bad now and it seems a million times worse than when I first got the car. Probably my mind playing tricks since the restrictor plate worked so well. Anyway, how do I fix this? The plate is still on there and the RPMs hang just a tad too much to ignore. I mean, it has completed messed with how I naturally drive the car. I'm assuming there's some flashing of the computer, uninstalling, and reinstalling of the plate in order but I just don't know. Can someone help me out?
Thanks.
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Old 09-05-2012, 12:57 PM   #288
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Re: Redoing The Fix?

Quote:
Originally Posted by Tommy Z View Post
I did the fix for the hanging RPM problem on my '03 and it worked great. Not too long after, I put the Diablosport Predator on it and had no issues. A few months ago, I got some bad gas (we think) and pulled the tune off to help with the detonation. The RPMs hang bad now and it seems a million times worse than when I first got the car. Probably my mind playing tricks since the restrictor plate worked so well. Anyway, how do I fix this? The plate is still on there and the RPMs hang just a tad too much to ignore. I mean, it has completed messed with how I naturally drive the car. I'm assuming there's some flashing of the computer, uninstalling, and reinstalling of the plate in order but I just don't know. Can someone help me out?
Thanks.
see post #252
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Old 09-05-2012, 02:44 PM   #289
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Quote:
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see post #252
Ahh gotcha, thanks. I'm assuming the plate stays in? And does it matter if/when I put the Prefator back on? Thanks.


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2003 Torch Red Mach 1
★ Rebuilt 3650 & MGW
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★ H&R Super Sports & Maximum Motorsports struts/shocks
★ Maximum Motorsports rear lowers, MM panhard, MM caster camber plates
★ Mosers + ARPs
★ Brembo slotted rotors, braided lines
★ Catless X and SLP LM2s
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Old 09-12-2012, 12:51 PM   #290
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Re: Hanging/Slow dropping RPM FIX inside.

Quote:
Originally Posted by TRbetngu View Post
My mach has this same problem. Ill be driving and then Ill come to a stop and the RPMs will be at 1500, almost 2000 in some cases, and then after sitting there for maybe 4-5 seconds it drops down to like 600 and almost wants to die. Will the NC plate help?
Mine did the same exact thing until I decided to replaced the IAC with a new one from Ford for about $100 or so. I cleaned the original IAC with brake part cleaner, but still didn't work. I guess it was real sticky?
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Old 10-14-2012, 05:15 PM   #291
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Re: Hanging/Slow dropping RPM FIX inside.

Awesome little mod, can't believe I waited so long to do it!
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Old 10-26-2012, 10:26 PM   #292
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Re: Hanging/Slow dropping RPM FIX inside.

Glad i stumbled on this thread. I've had my auto mach about 3 weeks or so, only driven it a few times. Every first startup this thing fires up aggressive and just stays there like 10-15 seconds it seems(prob a little exaggerated,lol), then finally comes down to idle. I'm always like wtf, thats a bit much and annoys the **** outta me,lol. Def. making one of these tomorrow!
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Old 10-27-2012, 06:00 PM   #293
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Re: Hanging/Slow dropping RPM FIX inside.

Liked the way the rpms dropped to idle with the 9/32 hole, just not how it idled with max a/c on. So i opened it up to 11/32, its better with a/c.....but not how i liked it dropping with the 9/32 hole. Amazing how much it changes with a 1/32 of an inch!


*Edit..... after further review, the call on the field has been overturned! 11/32 hole is working great like had hoped.

Last edited by NoSloCoupe; 10-31-2012 at 02:52 PM.
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Old 05-09-2013, 07:32 PM   #294
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Re: Hanging/Slow dropping RPM FIX inside.

I see this is an ancient thread, but I got mine from SR Customs off ebay, not sure of the hole size (though both holes were the same size). I like it!! It isn't an in your face difference, when I first crank car, rpms drop much quicker, idles steady and smOoth at 800 rpms (notice rpm steady, but shaker is moving more like a cam installed, again subtle). Turned on A/C and headlights, idle dropped to 700 and stayed between 700 and 750 rpms, everything is real smooth and steady. When I bump the throttle to 2-3k and let off, revs drop quicker, but again it isn't massive (reading all the post I think where I got mine the hole size must be conservative), but overall, I like it and for $6.30, a bargain and worth a risk, I brought the original gasket and an 8 mm wrench with me in case I had to swap back, but zero issues, though I only got about 125 miles on 1/2 tank , could be the 4:10 gears and my right foot , don't really see how this could affect gas mileage (????), but in general pretty easy mod that works as advertised, don't find that very often nowadays. My two cents, have a nice evening everyone!!
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Old 10-19-2015, 02:15 PM   #295
ab_mach1
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Re: Hanging/Slow dropping RPM FIX inside.

Quote:
Originally Posted by NHRichard View Post
This is a unique solution to the IAC hanging issue.

Disconnect battery cables (without creating a spark) for several hours, may take 2 or 3 tries. This apparently is the only way to reset the computer.
Also, pump the brake pedal before detaching battery cable. Will eliminate
any residual electricity.

Was reving up to 2500 consistently until I applied the above technique.
Idles like a charm now.

Go figure.
That is basically forcing the idle relearn. I can't imagine it takes hours. I've gotten the idle to relearn with just unplugging the negative cable for 15 minutes. I turn the lights on and hit the brakes, then reconnect the battery.

- Let the car idle and get up to normal operating temp. I wait until my fan comes on in the summer months.

- Then wait at least 1 minute after reaching normal operating temp.

- Turn on the AC to Max and let idle at least another minute.

- The turn off the AC and go for at least a 10 mile drive. I usually cruise around for 10 - 15 miles, then do one or two WOT's. The computer will still continue learning idle, but you should notice a big improvement from when you first started it up.

I do this any time I change my tune, or when the mechanic I go to disconnects the battery for any reason.
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Old 12-19-2017, 11:10 PM   #296
CajunMach1
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Thumbs up Re: Hanging/Slow dropping RPM FIX inside.

This is on my to do list now, sorry to bring back this old thread but this is good info for us newbs.
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Old 12-30-2017, 05:49 PM   #297
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Thumbs up Re: Hanging/Slow dropping RPM FIX inside.

So I did this mod today, didn't use a metal plate but picked up one made out of mr gasket header gasket material, it came with 9/32 and 11/32 holes and immediately when we started the car up I could tell a difference, rpms come down much faster and the car kind of sounds like it has a mile cam now @ idol. Was not able to test drive the car but maybe tomorrow early before the N.Y.E. crazies hit the roads.

Thanks for this awesome info
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