unusual engine vibration

L

limestang

New Member

Jun 20, 2009

7

0

0

Jul 3, 2009

#1

• Jul 3, 2009

• #1

Hey everybody,

Just recently a strange vibration has been coming from my engine. It only occurs at the lower RPM's of each gear and fades away after further acceleration. In addition, it cannot be felt when the car is idling or when the engine is revved in park or neutral.....just when the engine is under a load. The engine is a 289 with 145,000 miles on it and has never been rebuilt if that helps at all. Any ideas or responses will be greatly appreciated.

 

2

2+2GT

10 Year Member

Apr 25, 2009

3,333

10

79

Southeastern Pennsylvania

Jul 4, 2009

#2

• Jul 4, 2009

• #2

Start with the basics. Do a full tune-up, new wires and plugs, etc. While you have the plugs out, check the compression.

 

CraigMBA

New Member

Mar 24, 2007

783

1

0

Orange, CA

Jul 4, 2009

#3

• Jul 4, 2009

• #3

I'd do a motor mount check if it were me.

 

jonfor

New Member

Apr 20, 2009

59

0

0

Columbus, GA

Jul 4, 2009

#4

• Jul 4, 2009

• #4

ditto for me, but i have an '87 engine with *who knows* what front cover and accessories? i heard a sliver of information that my dampener was suspect for being the wrong size???

 

2

2+2GT

10 Year Member

Apr 25, 2009

3,333

10

79

Southeastern Pennsylvania

Jul 5, 2009

#5

• Jul 5, 2009

• #5

jonfor said:

ditto for me, but i have an '87 engine with *who knows* what front cover and accessories? i heard a sliver of information that my dampener was suspect for being the wrong size???

Click to expand...

If true it would vibrate badly, increasing with engine speed.

 

gtss

Member

Apr 30, 2002

133

2

19

Airdrie,Alberta

Jul 6, 2009

#6

• Jul 6, 2009

• #6

are you sure it is actually coming from the engine, based on what you are describing, the first thing that came to mind is a u-joint/driveline issue.
but it is really hard to diagnose that without feeling it,

gtss

 

mhjo

Founding Member

Nov 9, 2000

490

0

17

Oslo, Norway

Jul 12, 2009

#7

• Jul 12, 2009

• #7

Check also tranny- mount

 

S

suki243

Member

Dec 19, 2006

662

0

19

Southern California

Jul 12, 2009

#8

• Jul 12, 2009

• #8

I had a similar issue; check spark plugs; i had the original air filter and cover with the snorkel and everything; one of the wires had cracked a little and would actually jump to the air cleaner's snorkel. I also had to adjust the idle rpm. I did both at the same time so i'm not sure which one did it but i think it was a bit of both.

 

L

limestang

New Member

Jun 20, 2009

7

0

0

Jul 12, 2009

#9

• Jul 12, 2009

• #9

The plugs, wires, and motor mounts are all in great condition. I checked the wheels and wheel bearings themselves just to make sure nothing was loose or going bad and they are all fine. Timing is spot on and I even adjusted the valves and its still doing it. Another thing i did that 2+2GT recommended was check the compression and all of the cylinders were below recommended compression but still within the recommended allowance of each other. Could this be the source of my issue?

 

Rusty67

20+ Year Stangneter

Dec 3, 2002

3,749

37

109

LA, CA

Jul 12, 2009

#10

• Jul 12, 2009

• #10

Do you have a stick or auto trans ? If you have a stick, check your clutch adjustment.