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November 16th, 2011, 12:29 AM
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#1 |
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Chitty Chitty Bang Bang
2001 Mustang GT
Join Date: Jun 2011
Location: Tampa, Florida
Posts: 1,254
 iTrader: 2 reviews
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Slight vibration while idling - not sure what it is?
So since I can remember on this car, I've had this slight vibration at idle. I've noticed when I first start the car and come to a full stop or red light, the RPMS stay right at 1000k; however, when I start driving a bit and get the motor warm at a stop light the RPMS drop to normal 600-700 at idle. At the higher RPM the car idles fine, but when it idles at 600-700 rpm the car shakes a bit. The rpms stay dead constant, but there's this vibration or shake. What could be causing this, and what tests should I run? I've tried
-New IAC -Replace back stock intake -New upper intake (old was plastic and cracked at thermostat) -New plugs -Checked for vacuum leaks -New COPS
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2001 Mustang GT 5-Speed  God Created Man, but Sam Colt Made Them Equal |
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November 16th, 2011, 09:19 AM
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#2 |
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Regular
2002 Mustang GT
Join Date: Mar 2009
Location: SC
Posts: 326
iTrader: 0 reviews
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I had that problem and it was my headers rubbing on the floor pan. Anything between the motor and chassis could cause some vibration. Have you checked the motor mounts?
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02 GT --> long tube headers w/ x pipe and flow masters, throttle body w/ intake plenum, cold air intake, short throw, 255 nitto 555's all around, 373 diff gears, 2 inch lowering kit w/caster camber plates, sony radio working with stock system 
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November 16th, 2011, 10:38 PM
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#3 |
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Chitty Chitty Bang Bang
2001 Mustang GT
Join Date: Jun 2011
Location: Tampa, Florida
Posts: 1,254
iTrader: 2 reviews
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It's not a vibration on just the floor pan but a vibration of the whole car. It's like a side to side sway type vibration that can really be felt in the shifter. How exactly do I know if the engine mounts are bad?
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2001 Mustang GT 5-Speed God Created Man, but Sam Colt Made Them Equal |
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November 16th, 2011, 11:48 PM
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#4 |
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Regular
2004 mustang GT
Join Date: Mar 2011
Posts: 405
iTrader: 7 reviews
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Check your harmonic balancer my wifes explorer was doing the same thing and the balancer was coming apart
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Flowmaster super44's, 70mm frpp TB, C&L plenum, K&N cai,UDP,SCT SF3/X3, TR3650, short throw shifter, Mac O/R H pipe Waiting to install vortech v2 s trim |
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November 17th, 2011, 09:31 AM
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#5 |
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Hardcore Enthusiast
2002 mustang gt
Join Date: Jan 2010
Posts: 1,896
iTrader: 1 reviews
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Could it be misfiring? Headers againt floor? Bad motor mounts, solid motor mounts?
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Rock stock 
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November 17th, 2011, 09:32 AM
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#6 |
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Hardcore Enthusiast
2002 mustang gt
Join Date: Jan 2010
Posts: 1,896
iTrader: 1 reviews
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Oh you said you can feel it in the shifter so it couldn't be solid motor mounts but it could be bad mounts
__________________
Rock stock
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