new iac, now rpms hang between shifts - Mustang Evolution

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Old 05-26-2013, 08:55 AM   #1
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new iac, now rpms hang between shifts

Any fixes to the problem.
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Old 05-26-2013, 09:03 AM   #2
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Have you cleaned the throttle body in awhile? That's what caused that on my old fox body a few years ago.
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Old 05-26-2013, 09:10 AM   #3
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I replaced egr valve so I sprayed TB cleaner in that side. Replaced iac and sprayed in that hole and took cai off and sprayed in there. So basically the best I could do without taking it off.

Should I take it all the way off and clean? I also cleaned mass air sensor.
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Old 05-26-2013, 01:14 PM   #4
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Did you disconnect the battery for 5-7 minutes to clear the Keep Alive Memory (KAM)? This will force the PCM to learn new idle airs and other IAC behaviour. Let the engine idle for 15 minutes after clearing the memory. It can then take 50 to as many as 100 miles of driving for the virtual dashpot and other things to really settle down.

The KAM should be cleared whenever any intake or emissions related device is changed out.
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Old 05-26-2013, 04:31 PM   #5
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Yea I disconnected battery. I haven't put no 50-100 miles on it yet. I messed around with making iac restrictor plate but kinda gave up.

Ill put some more miles on it tomorrow and see if it helps.

After it warms up, it idles at like 750 rpms. It almost feels cammed lol. But u have to slip clutch cause of hanging rpms.
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Old 05-26-2013, 08:04 PM   #6
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Quote:
Originally Posted by jdavis96gt View Post
Yea I disconnected battery. I haven't put no 50-100 miles on it yet. I messed around with making iac restrictor plate but kinda gave up.

Ill put some more miles on it tomorrow and see if it helps.

After it warms up, it idles at like 750 rpms. It almost feels cammed lol. But u have to slip clutch cause of hanging rpms.
Is it a 5-speed? If so 750 rpm (actually 752 in most stock tunes) is where it is supposed to idle...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-26-2013, 08:38 PM   #7
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Its a 5 speed. Other than rpms sticking/hanging its really smoother now.

Do them plates really help? I've tried making couple. Got rpms to start dropping but idle was way off, like 1200.
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Old 05-26-2013, 08:56 PM   #8
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Quote:
Originally Posted by jdavis96gt View Post
Its a 5 speed. Other than rpms sticking/hanging its really smoother now.

Do them plates really help? I've tried making couple. Got rpms to start dropping but idle was way off, like 1200.
A much easier way to do it is to use a 1/2" copper pipe cap. Drill a hole in it (17/64" Is a good place to start) and insert it into the IAC feed tube...

More about that here ...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-26-2013, 09:02 PM   #9
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Yea thats a pretty good idea, much easier to just pull hose off. No chance off it getting sucked into TB?
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Old 05-27-2013, 08:00 AM   #10
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Quote:
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Yea thats a pretty good idea, much easier to just pull hose off. No chance off it getting sucked into TB?
It won't fit through the nipples on either the resonator or IAC inlets...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-28-2013, 07:01 AM   #11
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Had to ask lol. Thanks
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