Vibration after 60mph on 91 Formula
#1
Junior Member
Thread Starter
Join Date: Nov 2002
Location: Long Island NY
Posts: 60
Likes: 0
Received 0 Likes
on
0 Posts
Vibration after 60mph on 91 Formula
hey all,
i just picked up a '91 formula
drives pretty nice but theres a vibration after 60mph, it feels like im running over a bunch of little bumps on the ground
just had the front wheels balanced and the problem is still there.
anyone have any suggestions as to what this might be, or what i can do to diagnose it?
i just picked up a '91 formula
drives pretty nice but theres a vibration after 60mph, it feels like im running over a bunch of little bumps on the ground
just had the front wheels balanced and the problem is still there.
anyone have any suggestions as to what this might be, or what i can do to diagnose it?
#6
Supreme Member
Join Date: Nov 2003
Location: surrey b.c. canada
Posts: 3,383
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc
Engine: lb9
Transmission: wc t-5
Axle/Gears: 10 bolt 3.08 posi
well once it gets to a high enough rpm the minor imbalance would be vibrating more
could just be an improperly balanced tire
basically start with getting your tires checked which is dirt cheap then get alignment done( won't hurt it )
if both those fail its the driveshaft
could just be an improperly balanced tire
basically start with getting your tires checked which is dirt cheap then get alignment done( won't hurt it )
if both those fail its the driveshaft
#7
Member
Join Date: Aug 2004
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
Re: Vibration after 60mph on 91 Formula
Originally posted by CarAteMyMoney
just had the front wheels balanced and the problem is still there.
just had the front wheels balanced and the problem is still there.
I would check you motor/tranny mounts. Check tires for any slight bumps or imperfections. Vibrations can be many things, harmonic balancer, torgue converter, etc. Start with tires, alignment, steering component checks, bushings, tranny mount, motor mounts, re-torque your mounts if needed, then check u-joints and drive shaft pinion angle.
Trending Topics
#10
Member
Join Date: Aug 2004
Location: Topeka, Kansas
Posts: 203
Likes: 0
Received 0 Likes
on
0 Posts
Car: 82 Camaro
Engine: 305
Transmission: TH-350
Axle/Gears: 3.08
I had the exact problem on my 82 camaro, and i only had it about 6 months before the engine crapped out on me, so i never really got around to finding the problem. But when i went to pull the engine and tranny (2.8/TH-200), i discovered that I had NO, repeat, NO drivers side tranny mount bushing, so check on that. I hope that was what was wrong with mine. Wish me luck, cause tomorrow, the rebuilt 305 gets primed and started (hopefully) for the first time tomorrow :rockon: if that's my prob, i'll post back tomorrow night
#11
Junior Member
Thread Starter
Join Date: Nov 2002
Location: Long Island NY
Posts: 60
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by BRobinson
I had the exact problem on my 82 camaro, and i only had it about 6 months before the engine crapped out on me, so i never really got around to finding the problem. But when i went to pull the engine and tranny (2.8/TH-200), i discovered that I had NO, repeat, NO drivers side tranny mount bushing, so check on that. I hope that was what was wrong with mine. Wish me luck, cause tomorrow, the rebuilt 305 gets primed and started (hopefully) for the first time tomorrow :rockon: if that's my prob, i'll post back tomorrow night
I had the exact problem on my 82 camaro, and i only had it about 6 months before the engine crapped out on me, so i never really got around to finding the problem. But when i went to pull the engine and tranny (2.8/TH-200), i discovered that I had NO, repeat, NO drivers side tranny mount bushing, so check on that. I hope that was what was wrong with mine. Wish me luck, cause tomorrow, the rebuilt 305 gets primed and started (hopefully) for the first time tomorrow :rockon: if that's my prob, i'll post back tomorrow night
#12
Supreme Member
Join Date: May 2004
Location: Kingston, Tn
Posts: 2,924
Likes: 0
Received 1 Like
on
1 Post
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Could be u-joints as well, a truck we had drove great until about 65 then had a vibration in it. Turned out the u-joints were actually loose where they connected to the rear and caused the vibration.
#13
Junior Member
Join Date: Dec 2002
Location: Massachusetts
Posts: 92
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Z28
Engine: 350 with ads
Transmission: 700r4
Go down the road a littlel faster than when the vibration starts, say 70mph or so. Once cruising put the car in neutral and see if teh vibration goes away.
If yes then teh vibration is engine or torque converter related.
If no than it is tires or driveline related. I had a similar problem with my 89 IROC. the car had been sitting for so long, and teh tires were close to bald that there were small flatspots that caused a nasty shake....
Best of luck...
If yes then teh vibration is engine or torque converter related.
If no than it is tires or driveline related. I had a similar problem with my 89 IROC. the car had been sitting for so long, and teh tires were close to bald that there were small flatspots that caused a nasty shake....
Best of luck...
Thread
Thread Starter
Forum
Replies
Last Post
Linson
Auto Detailing and Appearance
12
10-01-2015 09:50 PM