1999 Mustang Cobra IAC restrictor? - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 07-17-2014 Thread Starter
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1999 Mustang Cobra IAC restrictor?

My 1999 SVT convertible has the issue that many 4.6 cars apparently have, which is that it holds rpm's too long between shifts or in neutral. There is an easy fix where you put a drilled copper pipe cap into the IAC feed which restricts the idle flow, but I can't seem to find the feed on my Cobra. I noticed the IAC and IAC feed are external on GT's, is my SVT's IAC feed inside the intake? If so, how can I get to it so that I can try the copper cap trick? Any help is appreciated!

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post #2 of 6 (permalink) Old 07-18-2014
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The only thing I've done is clean the IAC, haven't heard of this issue?


99 SVT Cobra-Teksid.020(284ci)
Stock HCI,Manley Pistons & H Beam Rods
Polished Vortech V-2,Reichard 3.10/6.75ATI(14lbs Boost)
GodSpeed SpecV Intercooler,60's,Twin Aviator's,
04 SVT Tank/Twin Hat,SCT-BA5000,BF IRS Brace
MPH Powerpipe,ProCharger BPV,
Mac O/R H & 2.5 CB
Vogtland Springs,Bilsteins,MM CC Plates,Steeda Tri-Ax,MT ET Streets
Home of Worlds Fastest All Ford Outlaw 10.5 Car 4.03/200.80 Fordspeed Racing
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post #3 of 6 (permalink) Old 07-19-2014 Thread Starter
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Hmm, I may try cleaning it then. Definitely don't have the money for a new IAC at the moment. If anyone knows about the feed location for a Cobra I'm still interested!
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post #4 of 6 (permalink) Old 07-20-2014
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be careful removing the 2 IAC bolts they tend to break..

99 SVT Cobra-Teksid.020(284ci)
Stock HCI,Manley Pistons & H Beam Rods
Polished Vortech V-2,Reichard 3.10/6.75ATI(14lbs Boost)
GodSpeed SpecV Intercooler,60's,Twin Aviator's,
04 SVT Tank/Twin Hat,SCT-BA5000,BF IRS Brace
MPH Powerpipe,ProCharger BPV,
Mac O/R H & 2.5 CB
Vogtland Springs,Bilsteins,MM CC Plates,Steeda Tri-Ax,MT ET Streets
Home of Worlds Fastest All Ford Outlaw 10.5 Car 4.03/200.80 Fordspeed Racing
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post #5 of 6 (permalink) Old 10-05-2014
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My 98 cobra did the same thing. I made a new gasket for the idle sensor with smaller holes. Rpm's drop a lot faster now but I still have a problem with my high idle. It fluctuates from 12-2200 Rpm's. engine breaking works when it wants. Cant find a vacuum leak and I unhooked every sensor I could find and idle never drops. It did fine fpr a while juat surged when I pushed in the clutch. This morning I stalled it whill backing up and it started the high idle again and quit surging. Made the new gasket for the idle sensor cleaned my egr valve checked for vacuum leaks and checked my tps. Can somebody help me with this problem?
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post #6 of 6 (permalink) Old 10-05-2014
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And now its losing bottom end and while driving down the road the engine breaking kicks in and I lose all throttle. I have to pump it a few times and it comes back.
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