Vibration in motor

Mustang_289 · 06-09-2003, 09:09 PM

Our 88GT has a vibration in the motor - when your driving or when sitting still idling at 3K. We're going to look at the harmonic balancer - swap out with new one. Is there anything else that it could be?

Mustang_289 · 06-11-2003, 05:17 AM

Any thoughts from the experts on this board?

Mountain Main · 06-11-2003, 06:49 AM

Its possible that it could be a flywheel. Probably is the harmonic balancer. Check the rubber on the harmonic balancer. Check your motor mounts. Just my two cents.

Mustang_289 · 06-12-2003, 07:02 PM

My son replaced the harmonic balancer last night and didn't stop the vibration in the motor. When he was taking the bolt out for harmonic balancer - we noticed oil on the bolt. This didn't seem right to me - I'm wondering if it's an oil seal that's causing this.

We'll look at the motor mounts any other ideas on what could cause vibration? Is there a way to check the flywheel without taking the trans out?

slider · 06-13-2003, 12:56 AM

how many miles on the motor?

It could be alot of things....

maybe one cyl isn't firing correctly? fouled plug? check all 8 cyls by running a compression and leak down test.

your best bet is to go based on the plugs. if that looks ok then start looking at your electronics.

PKRWUD · 06-13-2003, 01:03 AM

That's very unusual. The vibration is absolutely engine related because it does it standing still. That rules out the rest of the driveline. There are two primary causes for an engine vibration: a miss or it's out of balance. When it's a miss, the vibration tends to be worse at lower rpms, and to decrease as rpms increase. An unbalanced vibration tends to do the opposite.

Does your engine idle smooth? Is it smooth above 3000 rpms? Are there any codes? What transmission does it have?

Take care,
~Chris

06-09-2003, 09:09 PM	#1
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Vibration in motor Our 88GT has a vibration in the motor - when your driving or when sitting still idling at 3K. We're going to look at the harmonic balancer - swap out with new one. Is there anything else that it could be?

06-11-2003, 06:49 AM	#3
Mountain Main Registered Member Join Date: Feb 2003 Location: Minturn, CO 81645 Posts: 109	fly wheel Its possible that it could be a flywheel. Probably is the harmonic balancer. Check the rubber on the harmonic balancer. Check your motor mounts. Just my two cents.

06-13-2003, 12:56 AM	#5
slider Registered Member Join Date: Mar 2001 Location: San Diego, CA, USA Posts: 86	how many miles on the motor? It could be alot of things.... maybe one cyl isn't firing correctly? fouled plug? check all 8 cyls by running a compression and leak down test. your best bet is to go based on the plugs. if that looks ok then start looking at your electronics. __________________ Black 95 cobra S trim 8lbs 6037s Edelbrock heads Cobra intakes 1.7 Rockers Custom Cam

06-13-2003, 01:03 AM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	That's very unusual. The vibration is absolutely engine related because it does it standing still. That rules out the rest of the driveline. There are two primary causes for an engine vibration: a miss or it's out of balance. When it's a miss, the vibration tends to be worse at lower rpms, and to decrease as rpms increase. An unbalanced vibration tends to do the opposite. Does your engine idle smooth? Is it smooth above 3000 rpms? Are there any codes? What transmission does it have? Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Built Motor? Questions	Rosco	Windsor Power	1	10-22-2003 01:12 AM
Rebuilding an engine.. and then some	Halz	Windsor Power	5	04-01-2002 02:01 AM
What year and type of motor do I have..	Smokedawg	Windsor Power	18	08-15-2001 05:08 PM
GT-40p headed motor	89 Cobra LX	Windsor Power	5	06-15-2001 06:46 PM
Vibration thru vehicle when accelerator is pressed	race1now	Windsor Power	1	01-22-2001 12:28 AM

06-11-2003, 05:17 AM	#2
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Any thoughts from the experts on this board?

06-12-2003, 07:02 PM	#4
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	My son replaced the harmonic balancer last night and didn't stop the vibration in the motor. When he was taking the bolt out for harmonic balancer - we noticed oil on the bolt. This didn't seem right to me - I'm wondering if it's an oil seal that's causing this. We'll look at the motor mounts any other ideas on what could cause vibration? Is there a way to check the flywheel without taking the trans out?