Welcome to Mustang Evolution.
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02-19-2008, 08:13 PM
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#1
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bad vibration
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Registered User
Join Date: Feb 2008
Posts: 2
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Im working on a 94 mustang 5.0 that has a very bad viberation at idle and when reved up when coming back down shakes very bad i mean ever thing on car shakes any ideas?  |
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02-19-2008, 08:37 PM
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#2
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Re: bad viberation
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Pizza Lover
Join Date: Aug 2003
City: PSU
State: Pennsylvania
Posts: 7,369
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are the RPMs steady at idle or does it fluctuate a bit up and down? |
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02-19-2008, 08:43 PM
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#3
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Re: bad viberation
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 26,935
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sounds like the idle is to low, does it have a cam, what does it idle at?
__________________
2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
Polished Borla Stingers, MGW Shifter, JLT CAI, SS Inserts, MM FLSFC, MM CC Plates,
10th Anniv Brakes, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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02-19-2008, 10:20 PM
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#4
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Re: bad viberation
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Registered User
Join Date: Feb 2008
Posts: 2
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the engine shakes like it has a bad miss but doesnt like some in the engine isnt balanced .compression is good plugs and wires is good |
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02-19-2008, 10:39 PM
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#5
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Re: bad viberation
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Mustang Evo NEWB
Join Date: Aug 2004
City: millville
State: New Jersey
Posts: 4,866
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Pull the cap off the rotor and make sure all the contacts look fine, make sure the rotor looks good, pop the rotor out make sure the locating tab isn't snapped or cracked
check fuel pressure if you can, an injector could be bad... --
check around the balancer, make sure nothing is loose or cracked/hanging out, try taking the drive belt off (you can run it for a minute or two this way) see if it still vibrates badly..
Could also be a cracked or warped pressure plate/ flywheel
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1992 Mustang LX hatchback.. 1 of 542 black on black
2003 Regal GS - the beater/daily driver - somewhat stock. No its not a mustang, at least it's blown.
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02-19-2008, 11:19 PM
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#6
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Re: bad vibration
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I just lubricated on your foot!
Join Date: Feb 2007
City: Vicksburg
State: Mississippi
Posts: 771
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My guess was also going to be a possible fuel flow problem similar to what Monte said above...I was thinking a fuel pump or injector issue....
Sounds to me like you could possibly be having a fuel problem causing the whole motor or just a cylinder to be running way lean and that's making the terrible vibrations...
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'05 GT - Borla Catback, Koni Adjustable Shocks/Struts, Hawk HP+ Brakes all around, Steeda Front Sway Bar & End-Links, Hoosier A6's on Enkei Race Wheels, Royal Purple Fluids
'07 F-150 Ext. Cab XLT Flareside - 5.4 Triton - Roush Dual Exit Cat Back
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03-17-2008, 11:38 AM
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#7
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Re: bad vibration
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Registered User
Join Date: Dec 2006
Posts: 13
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mine had the same problem last year. It ended up being the harmonic balancer
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-Doug
'95 Mustang GT
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03-18-2008, 08:47 PM
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#8
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Re: bad vibration
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ME hometown supporter
Join Date: Jan 2005
City: Harvest
State: Alabama
Posts: 925
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good point rocket 50!
a basic cyclinder balance test will tell you right away if its a mechanical problem, if everything checks there I would look at engine balance (clutch problem, balancer bad, flywheel out of spec.)
you can do this two ways, either from the computer via Koer and hit the throttle quickly OW, or the old fashioned and my favorite, a pair of insulated plyers and a tachometer record the drop in rpms as you disconnect each cylinder, the lowest drop is your strongest cylinder. a bad cylinder will have nearly no drop at all.
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5.4 liters of pushrod 
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03-19-2008, 09:22 AM
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#9
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Re: bad vibration
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Pizza Lover
Join Date: Aug 2003
City: PSU
State: Pennsylvania
Posts: 7,369
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alternatively you can just overpower the bad vibrations by listening to the beach boys good vibrations really loudly. |
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