Rattling from underneath my Car!

S

shlby123

Founding Member

Apr 19, 2002

579

0

0

Dallas

Aug 25, 2006

#1

• Aug 25, 2006

• #1

hey everybody! Im having a problem with my '90 5.0 mustang with the auto. tranny. When I first drive the car to work in the morning it's ok for about 10 minutes without any noise but AFTER about 10 minutes and then on for the rest of the day, there is a rattle under the car when I try to accelerate. My first guess is obviously the tranny. I believe I've heard a similar noise when I was having probs with the tranny on my mustang, But the car still shifts very smoothly and all...it's just that the hard I try to accelerate the louder the rattle is....and then when I let off it reduces down to the point where I cant here it all? I guess what I need to know of this is an indicator that my tranny is shot? Or is it possible to save it?

 

S

SamSnyder

New Member

Mar 30, 2005

196

0

0

Aug 25, 2006

#2

• Aug 25, 2006

• #2

Consider your cats. I don't know if it happens in factory cats, but I had a Steeda/Moreflow (or some such brand) 2.5" cat h-pipe and the cats went South with a major rattle. The ceramic honeycomb guts broke up inside there, and when it happened I thought sure I'd dropped a valve. It really did sound like a rocker arm broke or something. And like yours, it was heat and speed sensitive. Could just be time for a new h-pipe.

 

MahFiVeOh

Founding Member

Apr 26, 2002

531

9

49

Ontario, Canada

Aug 26, 2006

#3

• Aug 26, 2006

• #3

SamSnyder said:

Consider your cats. I don't know if it happens in factory cats, but I had a Steeda/Moreflow (or some such brand) 2.5" cat h-pipe and the cats went South with a major rattle. The ceramic honeycomb guts broke up inside there, and when it happened I thought sure I'd dropped a valve. It really did sound like a rocker arm broke or something. And like yours, it was heat and speed sensitive. Could just be time for a new h-pipe.

Click to expand...

I had one of my cats go bad also, it sounded just like an engine knock. Just crawl under and "rattle" the exhaust and see if you can hear the noise.

 

S

shlby123

Founding Member

Apr 19, 2002

579

0

0

Dallas

Aug 26, 2006

#4

• Aug 26, 2006

• #4

I really want to but the catch to it is, is that the noise will only start once Im in gear, and moving down the road. What I did was take the car through a very narrow pass yesterday in a neighborhood, had somebody drive while I tried to take a sound/video clip with my digital camera, but after 3 unsuccesful passes at trying to get the camera to pick up the noise so I could show ya'll what it sounds like, the camera would only pick up wind! It's been so tricky....And since it only makes that noise after 10 minutes when i start driving it during the day...it's baffling me...how can I diagnose it, if I cant get a real sound clip, and I can get the noise when the car is at a standstill?

 

S

SamSnyder

New Member

Mar 30, 2005

196

0

0

Aug 26, 2006

#5

• Aug 26, 2006

• #5

Not exactly the safest thing to do, but you could put the rear end up on jack stands, although I wouldn't crawl under the car when you do.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Aug 26, 2006

#6

• Aug 26, 2006

• #6

Are your motor mounts in good shape? Otherwise, the motor and drivetrain can torque-load when you're in gear, and if there's an interferance issue, it can make noise.

I'd also check heat shields.

Good luck.

 

S

shlby123

Founding Member

Apr 19, 2002

579

0

0

Dallas

Aug 26, 2006

#7

• Aug 26, 2006

• #7

lol, my girl suggested putting the rear end on jack stands last night! If i get bored enough tomorrow i just might have to do it! I have heard that my problem could be a heat shield. Is there any walkthroughs that would help me get that taked care of myself?

 

S

shlby123

Founding Member

Apr 19, 2002

579

0

0

Dallas

Aug 27, 2006

#8

• Aug 27, 2006

• #8

Bump bump..I couldnt find anything...anybody got a link or anything at all?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Aug 27, 2006

#9

• Aug 27, 2006

• #9

What are you lookin for more info about?

 

S

shlby123

Founding Member

Apr 19, 2002

579

0

0

Dallas

Aug 27, 2006

#10

• Aug 27, 2006

• #10

just trying to find some more detailed info on changing out a heat, hopefully with some pics and stuff.

 

S

SamSnyder

New Member

Mar 30, 2005

196

0

0

Aug 27, 2006

#11

• Aug 27, 2006

• #11

Not sure what heat shield you're talking about -- the outer skin on the cats? Don't know about that. It's been a few years but as I recall, when my cat first started rattling it was minor, and I actually squeezed the one that was rattling, which actually stopped the rattling for a while. My thinking was that if the honeycomb inside was loose, I might wedge it in place by squishing the cat body slightly. What the heck, I knew it was f***'d up anyway. And it worked -- for a while. I seem to recall wedging a block of wood between the cat and the floorpan, and jacking up underneath the cat to compress the outer shell. It worked for a while but it ultimately failed completely, with a rattling sound like a busted rocker arm. However, I was sure it was the cat before I started smashing it up. I ultimately just got a new h-pipe.

 

9

9050lx

Member

Aug 31, 2006

33

0

6

Sep 1, 2006

#12

• Sep 1, 2006

• #12

I had a rattle from the MAF sheet metal bracket directly in front of the passenger shock,Might as well tighten this down also.

 

fivespeedsteed

20+ Year Stangneter

Oct 17, 2003

748

22

69

Richmond, VA

Sep 1, 2006

#13

• Sep 1, 2006

• #13

heatplate. the sheild over that cats. my front passenger side is my noisy one.