Hanging/Slow dropping RPM FIX inside. - Page 8 - 2003-04 Mach 1 Registry Owners Club

CajunMach1 · 12-19-2017, 11:10 PM

This is on my to do list now, sorry to bring back this old thread but this is good info for us newbs.

CajunMach1 · 12-30-2017, 05:49 PM

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

nicky rash · 05-14-2011, 09:41 PM

Thanks for posting this.That has always been aggrivating as crap on all these cars.

Evn62719 · 05-26-2011, 10:36 AM

Great mod, it works like a charm. I didn't read through all of the replies but for a cammed motor I would suggest going with a 3/8" hole. Mine had a tough time idling with the a/c on and died on me twice after pushing the clutch in to stop with a 9/32 hole.

Tommy Z · 07-01-2011, 10:52 PM

Just did this at 5/16" hole. Very noticeable difference. Thanks!

taca76 · 07-26-2012, 07:14 PM

Thank you for the info on the hanging rpm's!I can't wait to get to it.

Smoke87 · 08-28-2012, 07:33 PM

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!!

Tommy Z · 09-05-2012, 12:41 PM

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.

na svt · 09-05-2012, 12:57 PM

Quote:

Originally Posted by Tommy Z

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

Tommy Z · 09-05-2012, 02:44 PM

Quote:

Originally Posted by na svt

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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12-19-2017, 11:10 PM	#1
CajunMach1 Mach 1 Jedi Knight Join Date: Dec 2017 Location: Ms, Gulfcoast Posts: 128	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.

05-14-2011, 09:41 PM	#3
nicky rash Registered User Join Date: Dec 2010 Location: rossville ga Posts: 32	Re: Hanging/Slow dropping RPM FIX inside. Thanks for posting this.That has always been aggrivating as crap on all these cars.

05-26-2011, 10:36 AM	#4
Evn62719 MarinesMach1 Join Date: Dec 2006 Location: Denham Springs,LA Posts: 467	Re: Hanging/Slow dropping RPM FIX inside. Great mod, it works like a charm. I didn't read through all of the replies but for a cammed motor I would suggest going with a 3/8" hole. Mine had a tough time idling with the a/c on and died on me twice after pushing the clutch in to stop with a 9/32 hole. __________________ P1SC/3.4 pulley,60# injectors, Comp stage 2 blower cams,Cp pistons, Probe rods Beehive valve springs,AFM power pipe,SLP line lock,Cobra tank and pumps,BBK long tubes, o/r x,Magnapacks,T56-26 spline input shaft, MGW shifter,Centerforce DFX, Steeda springs,Steeda H/D UCA's,Metco LCA's,Eaton posi,3.73's,Moser 31 splines, Black 18" FR500's 295/35 BFG drag radials.

07-01-2011, 10:52 PM	#5
Tommy Z Registered User Join Date: Jun 2011 Location: Midland, Texas Posts: 787	Re: Hanging/Slow dropping RPM FIX inside. Just did this at 5/16" hole. Very noticeable difference. Thanks!

07-26-2012, 07:14 PM	#6
taca76 Registered User Join Date: Jul 2012 Location: new haven indiana Posts: 2	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.

12-30-2017, 05:49 PM	#2
CajunMach1 Mach 1 Jedi Knight Join Date: Dec 2017 Location: Ms, Gulfcoast Posts: 128	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

08-28-2012, 07:33 PM	#7
Smoke87 Registered User Join Date: Aug 2012 Location: Sylvester, Ga Posts: 13	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!!

09-05-2012, 12:41 PM	#8
Tommy Z Registered User Join Date: Jun 2011 Location: Midland, Texas Posts: 787	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. __________________ No accident that my birthday is March 1st. Take out the 'r' and you end up with.... 2003 Torch Red Mach 1 ★ Rebuilt 3650 & MGW ★ Spec 2 & Fidanza flywheel ★ 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 ★ 18X9/10.5 - Toyo R888R

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