What Could It Be?

93horseman · September 7th, 2011, 09:46 PM

My 93 5.0 has developed a vibration problem. The vibration is worst in 2nd gear between 2000rpms and 3000rpm and third gear between 1500rpms and 2000rpm while accelerating but present in all gears to some degree. It really can be felt through the steering wheel. While cruising at a steady speed it almost goes away. The engine shakes a little while at idle and reving in neutral does not produce any vibration. I inspected the car and the driver side motor mount is cracked and appears to be missing a chunk of rubber. Is this the obvious culprit or should I look further?

1LOUDGT · September 8th, 2011, 06:40 AM

Since you feel it in the steering wheel its most likely a tire out of balance or bad tire. How is your alignment? Wouldn’t hurt to replace those motor mounts while the car is up on the lift.

93horseman · September 8th, 2011, 03:08 PM

Thanks for the reply Gt. I switched the tires front to back and still got the same vibration. I was thinking that because of the dirvers side mounts close proximity to the steering wheel linkage and shaft it mite transmit vibration. What should I look at on the suspension.

1LOUDGT · September 8th, 2011, 04:42 PM

Vibration at specific RPM usually means it is related to parts that rotate i.e. tires, wheels, drive shaft, u-joints, etc.

93horseman · September 8th, 2011, 10:56 PM

Its present all the time just worse(really noticeable) at those rpms. I will have to look at the drive shaft and u joints. The motor mounts have to go no matter what. Thanks again for the advice!

cleangtvert · September 9th, 2011, 07:11 AM

check your harmonic balancer. if their is rubber sqeezing out around it between the inner and outer rings than thats prolly the issue. very common with the 5.0's. i ve had a simmilar vibration since i got my fox last october.i allready replaced u-joints,drive shaft,motor mounts, and tranny mount. all of those parts helped alot, but i still have a small vibration! i'm building another motor though so im just going to let it ride for now. i'm going to buy a new summit balancer for it and put the stock balancer from the one im building on my old block

ocejo · September 9th, 2011, 01:34 PM

I had something similar. turned out to be the fuel filter. also had trouble starting, and wouldn't go past 35-40mph

93horseman · September 10th, 2011, 03:18 PM

Thanks for the replys. Funny, my fuel pump just went out about 3 weeks ago. I didnt change the filter then. mite give it a try. Mine will go as fast as needed just rattles a lot at certain rpms. I am gonna get back under the car tomorrow.

EscortSportage · September 11th, 2011, 03:10 AM

Tires could be screwed up, wheels could be out of balance, new motor mounts would help. Driveshaft could be off balance...

ryanw · September 11th, 2011, 12:10 PM

Id say

tires
wheels
balancer
drive shaft
motor mounts

93horseman · September 11th, 2011, 01:11 PM

How should i go about inspecting the drive shaft?

93horseman · September 11th, 2011, 08:14 PM

Couldnt get under the car today I did run the rpms up with the car in place to see if vibration could be felt. Well no vibration. So guess that rules out the accessories and the crank.

September 7th, 2011, 09:46 PM	#1
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	What Could It Be? My 93 5.0 has developed a vibration problem. The vibration is worst in 2nd gear between 2000rpms and 3000rpm and third gear between 1500rpms and 2000rpm while accelerating but present in all gears to some degree. It really can be felt through the steering wheel. While cruising at a steady speed it almost goes away. The engine shakes a little while at idle and reving in neutral does not produce any vibration. I inspected the car and the driver side motor mount is cracked and appears to be missing a chunk of rubber. Is this the obvious culprit or should I look further?

September 8th, 2011, 06:40 AM	#2
1LOUDGT Enthusiast 2006 GT 11.99@114 Join Date: Sep 2006 Location: Orlando, FL. Posts: 802 iTrader: 0 reviews	Since you feel it in the steering wheel its most likely a tire out of balance or bad tire. How is your alignment? Wouldn’t hurt to replace those motor mounts while the car is up on the lift. __________________ 2006 GT (Fastest) 2004 COBRA (Faster) 1990 LX 5.0 (Fast)

September 8th, 2011, 04:42 PM	#4
1LOUDGT Enthusiast 2006 GT 11.99@114 Join Date: Sep 2006 Location: Orlando, FL. Posts: 802 iTrader: 0 reviews	Vibration at specific RPM usually means it is related to parts that rotate i.e. tires, wheels, drive shaft, u-joints, etc. __________________ 2006 GT (Fastest) 2004 COBRA (Faster) 1990 LX 5.0 (Fast)

September 11th, 2011, 03:10 AM	#9
EscortSportage Hardcore Enthusiast 1989 Mustang GT 5.0 Join Date: Oct 2007 Location: CT Posts: 2,186 iTrader: 0 reviews	Tires could be screwed up, wheels could be out of balance, new motor mounts would help. Driveshaft could be off balance... __________________ Cage Maximum Motorsports Sparco QH/BE Nitto "a huge bad azz motor is nice untill you have to turn or stop"

September 11th, 2011, 12:10 PM	#10
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Id say tires wheels balancer drive shaft motor mounts __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

September 8th, 2011, 03:08 PM	#3
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Thanks for the reply Gt. I switched the tires front to back and still got the same vibration. I was thinking that because of the dirvers side mounts close proximity to the steering wheel linkage and shaft it mite transmit vibration. What should I look at on the suspension.

September 8th, 2011, 10:56 PM	#5
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Its present all the time just worse(really noticeable) at those rpms. I will have to look at the drive shaft and u joints. The motor mounts have to go no matter what. Thanks again for the advice!

September 9th, 2011, 07:11 AM	#6
cleangtvert Enthusiast 1991 gt vert Join Date: Oct 2010 Location: st louis Posts: 727 iTrader: 0 reviews	check your harmonic balancer. if their is rubber sqeezing out around it between the inner and outer rings than thats prolly the issue. very common with the 5.0's. i ve had a simmilar vibration since i got my fox last october.i allready replaced u-joints,drive shaft,motor mounts, and tranny mount. all of those parts helped alot, but i still have a small vibration! i'm building another motor though so im just going to let it ride for now. i'm going to buy a new summit balancer for it and put the stock balancer from the one im building on my old block

September 9th, 2011, 01:34 PM	#7
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	I had something similar. turned out to be the fuel filter. also had trouble starting, and wouldn't go past 35-40mph

September 10th, 2011, 03:18 PM	#8
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Thanks for the replys. Funny, my fuel pump just went out about 3 weeks ago. I didnt change the filter then. mite give it a try. Mine will go as fast as needed just rattles a lot at certain rpms. I am gonna get back under the car tomorrow.

September 11th, 2011, 01:11 PM	#11
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	How should i go about inspecting the drive shaft?

September 11th, 2011, 08:14 PM	#12
93horseman Newbie Join Date: Apr 2008 Posts: 49 iTrader: 0 reviews	Couldnt get under the car today I did run the rpms up with the car in place to see if vibration could be felt. Well no vibration. So guess that rules out the accessories and the crank.

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