Exhaust rattle? Time for a new one?
 

My 1990 mustang gt exhaust just started to rattle really loudly the last few days. Its almost to embarrasing to drive. Sounds like its falling apart. To me it sounds like it could be coming from one of my mufflers. Are there parts in their that can fall apart and cause this rattling vibration noise? How long do mufflers last? If I have to replace them should I redo the entire exhaust system, H-pipe, etc. Thanks for the input.

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Red 90 5.0, 17in Cobra Wheels, Saleen Wing, Cobra Rear Bumper, K&N cold air induction, Dual Flowmasters, Hurst Shifter, 5 lug conversion, cobra brake system, shorty headers

Do you have the stock H-pipe on the car with cats, the Cats have covers and if 1 or more of the weld is shot it makes that sound. I riped the ones off that ratteld on my car. only take the ones on the road side OFF, or just get a new H-pipe http://www.mustangworks.com/msgboard/smile.gif And yes it could be the muffer too Jack The car up and look and hear it, Make sure the Car will not move if it is started. Good luck!

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Engine: steel mounts, Under drive pulleys, K&N, Home ported Lower Intake, No power steering, No A/C
Drive Train: 3.55, T-5z,

Real power STUFF I Have and will put some time: Mac cold intake, 70MM TB, Valve covers (COOL ONES)255 Fuel pump NOS Dry 75HP, AFR 165 58cc, GT-40 Intake.
Next to get: Rocker Arms,Cam,Injectors 24, What might I need???See It at www.computerconquest.com

It also could be a broken muffler, you might want to check that. The welds might have broke on the pipe going into the muffler.

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-1989 GT, not stock.
-2000 Camaro SS-A4,
-1989 Chevy S-10, EX. Cab-383, RPM air-gap intake, demon carb., tubbed, trick flow TW heads, trick flow pistons, 6" rod's, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, 4 inch cowl hood, Ford 9", auburn Pro-series Posi, Pro-billet distributor, Sanderson Jet-hot coated headers, Custom radiator,

[This message has been edited by 1BAD89 (edited 11-09-2001).]

Mine did that just awhile ago, and my culprit was the heat shield over the cat. As mentioned above, just one of the welds had broke loose. I took it to a muffler shop and the guy zapped it back on real quick. Better than the quick and easy fix, he didn't accept payment for such a simple job! Gotta love that.

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89 LX 5.0 Notchback, near showroom condition, Flowmasters (my dream since 16)
98 Grand Cherokee 5.9 (Very rare and hence a driveway princess), 90 VW Jetta Diesel (200K, 45 MPG and all hers), 87 Cutlass (mine) 84 Cutlass (170K of faithful service)87 Bayliner 2250 Cuddy

Thanks for the suggestion! I am going to go check it out right now!

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Red 90 5.0, 17in Cobra Wheels, Saleen Wing, Cobra Rear Bumper, K&N cold air induction, Dual Flowmasters, Hurst Shifter, 5 lug conversion, cobra brake system, shorty headers

The honeycomb inside the catalytic converter might be broken. The best thing to do is start the car & look underneath to see where the sound is coming from. If it is the honeycomb, then you can get it taken off & flushed which means opened & emptied. Hope that helps a bit.

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89 coupe, 351W, 351W heads, 30lb injectors, 190lph pump, 80 maf, 70 tb, ? cam, cobra upper, gt 40 lower, 4.10s, (14.1@98)

Mine rattles sometimes when it comes loose off the hanger. I just reach under there and push it back on. Good luck, let us know what it was! http://www.mustangworks.com/msgboard/smile.gif

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Joe! 1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing! Click here! Or my website:www.joe4speed.com
99 Ninja ZX-6R:10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph http://www.duhspot.com/users/smiley/.../outtahere.gif

Joe-
Nice website! Cool graphics. I had to leave after that lobster pic though! Damn, made me hungry! I wish I still had my diving gear!

Take care,
-Chris

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Retired Moderator
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Another easy fix for loose cat shields is to put a couple of large hose clamps around the cat to hold them tight. Its lasted on our Explorer for over two years now.

Thanks, Chris... I haven't been there in months.. Women probs! YUK! Oh well.. soon enough it needs a huge update, I have to get rid of alot of Java, it looks cool and all, but doesn't work well on alot of peoples computers!You have a cool site too, how'd ya get all of that wreck stuff? Very cool!
Ohhh those were good lobsters too! :) I just ate Dungeoness crabs today! Now I'm hungry for more!

Lobster and crab. You're such a dog.

The pieces on my Ouch!! page were all parts I came across while working, except for the V6 with the burned piston (NHRA event) and the block with the sides blown out. That one belonged to a buddy that we race with (Sprints). He wrecked the engine one week, and brought it with him to put on display the next week. Fortunately I had my camera!

Take care,
-Chris