4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

fluctuating RPM's

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Old 10-03-2005, 05:35 AM
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neogenic83
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Default fluctuating RPM's

I noticed when I am going down the road coming to a stop when I put the car in to neutral My RPM's will rise and fall between 600-1300 and sometimes drop and kill the engine. when I am coming to a stop in gear below 1500 RPMs the car has the rise and fall feeling but under power. it never did this before the S/C install. I check everywhere for airleaks could not find them. it does say "Low MAF voltage" can't remember the exact Pcode. any ideas I know it is kind of vague
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Old 10-04-2005, 02:12 AM
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Default RE: fluctuating RPM's

anyone?
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Old 10-04-2005, 05:23 PM
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HAUS
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Default RE: fluctuating RPM's

did you change the injectors and if so did you get a maf made for you size injectors.
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Old 10-04-2005, 05:47 PM
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Dan04COBRA
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Default RE: fluctuating RPM's

Gonna assume you have a 4.6 and move this for you
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Old 10-05-2005, 04:26 AM
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neogenic83
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Default RE: fluctuating RPM's

yes I have 42lb injectors and a PRO-M MAM made for it. I am thinking I just may have to take it to a tuner. the blower came off another 02 and we had the same mods but every car is alittle diffrent so that may be some of it.
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Old 10-05-2005, 04:30 AM
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Default RE: fluctuating RPM's

yeah man get that tuned. check the air/fuel ratio.
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Old 10-05-2005, 02:30 PM
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Dan04COBRA
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Default RE: fluctuating RPM's

My MIL Eliminators made my idle fluctuate and hang, it was damn annoying.
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Old 10-06-2005, 03:36 AM
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Default RE: fluctuating RPM's

I know a few others who have S/C'ed GT's and they said theyb have the same problem I am wondering if this is just one of the headaches that come with modding. Can the tuner tune that low in the RPM?
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