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October 4th, 2006, 10:11 PM
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#1 |
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Newbie
Join Date: Oct 2006
Posts: 2
 iTrader: 0 reviews
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'99 Mustang Running Very Rough With Little Horsepower
Not sure where to start. I have a '99 mustang, V6 with 120,000 miles. When I crank the car it cranks fine, but now ides rough, and bogs down when accelarated. It cuts out pretty badly while driving. I have changed ou the fuel filter, spark plugs an wires. Not sure which direction to go. Would appreciate any help.
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October 4th, 2006, 10:58 PM
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#2 |
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Regular
2003 Mustang GT
Join Date: Oct 2006
Location: chesterfield, VA
Posts: 256
iTrader: 0 reviews
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try cleaning your IAC valve, check for vacuum leaks, it could also be the coil pack.
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70mm t/b, plenum, cast intake manifold, full magnaflow exhaust, JLT cai, FRPP c springs, anti roll kit, steeda upper control arms, custom tune, subframe connectors, HID headlights, mach 1 chin spoiler |
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October 4th, 2006, 11:39 PM
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#3 |
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MM Fanatic
2002 Mustang GT
11.47@120.58
Join Date: Aug 2005
Location: Valdosta, GA
Posts: 3,940
iTrader: 0 reviews
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IAC valve doesn't affect anything when driving, only idling. If the car stumbles on acceleration it's usually ignition related. I'd check to make sure you don't have any dead cylinders, and if you do check for fuel and fire there. It may lead back to a bad coil as was suggested.
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October 4th, 2006, 11:44 PM
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#4 |
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I Post Entirely Way Too Much
1999 Ford Mustang V6
14.79 @ 92.15
Join Date: Aug 2005
Location: University of Georgia
Posts: 8,859
Blog Entries: 1
iTrader: 0 reviews
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also check for seals on the intake manifolds. i had a similar problem after changing fuel filter, air filter, spark plugs/wires and even coil pack, and i had a leak at the back of my upper intake manifold- new gasket, perfection. check for vacuum leaks if you have good cyl. and use brake cleaner and spray around the manifolds, if the idle surges, you found the leak.
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ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters. 
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October 5th, 2006, 04:39 PM
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#5 | |
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Newbie
Join Date: Oct 2006
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October 5th, 2006, 05:32 PM
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#6 |
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I Post Entirely Way Too Much
1999 Ford Mustang V6
14.79 @ 92.15
Join Date: Aug 2005
Location: University of Georgia
Posts: 8,859
Blog Entries: 1
iTrader: 0 reviews
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this is bad. you have no power in the 3rd cylinder.
you have a bad oxygen sensor which tests the air/fuel ratio and is making your car run weak as well, probably very rich. egr flow goes from the passenger exhaust manifold and recirculates into a pump and into the intake manifold
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ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters.
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October 5th, 2006, 06:02 PM
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#7 | |
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Regular
Join Date: Dec 2005
Location: Chesapeake, VA
Posts: 431
iTrader: 0 reviews
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Re: '99 Mustang Running Very Rough With Little Horsepower
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2003 Mustang Mach1 1995 Thunderbird LX 4.6L; 1995 Mustang 4.2L; Eaton MPX Supercharger, 11.61 @ 118mph |
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