05-18-2011, 11:37 AM
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Mahderaytohrrrrrr
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Join Date: Feb 2011
Location: Millstone Township, New Jersey
Posts: 3,445
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$4 DIY to fix hanging shifts in 99-04 Ford Mustang GT's
Ok so I had an issue with my shifts hanging and even rising after I put the clutch in to shift. It made it hard to shift and drove me nuts so I posted a thread and got a link from hpwrestler220 (original DIY thread http://mustangforums.com/forum/4-6l-...ging-rpms.html) with a DIY for a fix. I tried it out and sure enough it worked real well so here is my simple DIY for a $4 fix.
NOTE: You will probably hear a hissing or "whooshing" sound when your car is running after this mod. This is due to the air rushing through the smaller hole.
Disclaimer: Matticus91, coolaid12@hotmail.com, www.mustangforums.com, and www.njstangers.org will not be held responsible for damage to your car, engine or components if you decide to attempt this modification using this guide.
What you'll need:
-5/16" or 8mm Socket preferably with an extension to make it easier.
-Scissors, the sharper the better
-Gasket material, $4 at any local auto supply store, just not Pep Boys 
-A 3/16 drill bit or hole punch
-Drill or dremel (I used a dremel and it worked fine)
-Carburetor cleaner if you plan to clean out your IAC valve while doing this.
-Pencil or pen
Step 1:
Locate the IAC as seen in the picture below. In order to get to the bottom bolt you're going to need to pull off the PCV hose that you see to the lower right of the IAC.
Step 2:Pull off the PCV hose and then remove the 2 bolts holding the IAC to the intake. Once done, being careful not to drop the gasket, unplug the IAC by pushing on the clip as shown below. Pull off the hose on the IAC and remove it.
Do not throw out the gasket! Keep it in case you need to revert back to it or if you have trouble passing emmisions. According to the other thread, the reason why the revs hang in the first place is because of emmsions settings done by ford.
Step 3:
If you are going to clean out the IAC use carb cleaner as Seafoam doesn't seem to do too much for this part. I sprayed the part and let it soak in carb cleaner over night.
Step 4:
Take the gasket material and gently unroll it so it's flat and doesn't curl up. Place the original gasket on the sheet and trace the shape onto the material, including the holes for the 2 bolts and the bigger hole where the air passes through.
Cut out the new gasket and use the 3/16" bit or punch to make the new holes.
Use your bolts to see that the holes are big enough. Try to make the holes neat and be careful not to tear it. I found it easiest to drill it out over a piece of cardboard.
Re-Assembly and Making sure it works:
Put everything back together making sure the gasket is properly aligned. Do not over-tighten your bolts! Go ahead and start the car up and make sure it idle's ok. If it idles too low or stalls then you made the hole too small, just make it bigger and try again.
If it works ok take it out for a drive and see what it's like. You might find that the RPM's drop too fast for your preference, if so just widen the hole a bit.
Good luck, hope someone finds this useful 
__________________
-Matt
 
2002 GT Manual Coupe, Silver on Black Leather with some mods. The rain/snow mobile 
2012 Kawasaki Ninja 650R Black on black zero mods. The daily driver
Want your car photographed/filmed? Click HERE!
Last edited by Matticus91; 05-18-2011 at 11:39 AM.
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