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#1
04-12-2007, 10:41 AM
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Heat shield or muffler
I've got a rattle as the car is warming up...noticeable at idle, but if the exhaust is still cold and I press the gas, I'll get a heat shield sounding rattle around 1500 rpm's.
What's different is that the sound is coming from the rear and possibly the muffler. Can anyone tell me if there are heat shields around the muffler area or at the back end of the exhaust? Or is it something internal inside the muffler? I haven't had time to crawl under the car to look, but I am also not allowed to work on a car in my apartment parking lot unfortunately 
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#2
04-12-2007, 11:19 AM
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the 1500 rpm rattle is VERY common on these cars it comes from the resonator you can cut it off and weld a straight pipe there instead
__________________
- John ASE certified Master Tech W/ X1 Twin City Fleet repair, St. Paul, MN need work done? Have tools will travel
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#3
04-12-2007, 11:31 AM
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Quote:
dcb
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#4
04-12-2007, 01:08 PM
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There are rattles, buzzes, and other wierd sounds that come from the muffler area. You almost have to crawl under it to find out just what is making the noise.
__________________
. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19
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#5
04-12-2007, 01:47 PM
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Quote:
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#6
04-13-2007, 05:20 AM
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I think the heat shield for the muffler may be this one piece that almost touches the back bumper..I thought I saw this once by just looking under the trunk area, but I'll try to jack up the car tonight and crawl under there to see what this ruckesss is about.
Resonator is under the transmission area of the car I believe and my noise appears to be the rear of the car.
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#7
04-14-2007, 03:15 AM
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I had a buzzing/rattling noise comming from what I thought was my mufflers heat sheild. I let it go because I was having a new exhaust put on in a few weeks. I had the new exhaust put on and it still made the noise. I finally decided to get under the car and take a look for myself. it just ended up being a few very small rocks that found there way up into the lip that folds up on the mufflers heat sheild. after I removed them it hasn't made the noise since. Might be someone elses problem too. Just thought I'd share.
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#8
04-14-2007, 08:47 PM
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I checked all welds and shields that I could and couldn't find the problem.
I jacked the rear of the car up and layed under there just after starting the car...The noise sounded like it was coming from inside the muffler.....more apparent when I had my ears by each tail pipe....And I checked the tailpipes and they are not loose....The noise went away after a few minutes as soon as the muffler warmed up. Tell me, is there something in the muffler that would be loose? What would be the best thing to do, buy a new muffler or take it to a muffler shop to really diagnose it incase I'm missing something, or what? What is involved in replacing the muffler? Rewelding to the rear inlet pipe, rewelding the tail pipe pieces on, etc.?
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#9
04-16-2007, 07:08 AM
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Would a loose baffle fix itself when the muffler warms up? That might be my problem.
I looked at parts on Subaruparts.com and what would be required to replace the muffler? New rear exhaust bearing or those rubber seals? Also, does magnaflow make a better muffler that would fit in place of the subaru one? Thanks, sorry for all the questions.
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#10
04-16-2007, 08:46 AM
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How do these babies sound without the resonator?
__________________
Current: 95 svx Ls-L (Black) 91 5sp awd xt6 (red) Had: 91 xt auto awd(lt blue) 85 xt 4wd turbo 5sp(blue/white) 86 xt 2wd turbo 5sp(black) 85 xt 4wd turbo 5sp(silver/white) 89 xt AWD 5sp (white) 85 xt 4wd turbo 5 sp sold to Zukiru (silver) 86 xt turbo 2wd 5sp (silver/black)
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#12
04-16-2007, 11:50 PM
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Exhaust resonator
I can almost promise the noise is the center resonator. It works like a pre-muffler. If i remember it has a thin pipe inside it that has alot of holes in it. the pipe breaks off and rattles intermittently. I have it removed from my 94 but it is still in place on my 92. Cutting it out does make a noticble increase in noise, and it changes the pitch, but if you didn't know what the car was supposed to sound like you would never know. The noise comes from INSIDE the system, that is why you hear it coming out of the exhaust outlets. The resonator is made into the center exhaust pipe, and is a breeze to replace for any exhaust shop, just remember to order all new bolts and gaskets.
~Nate ASE L1 master tech
__________________
2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life)
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#14
04-17-2007, 11:01 AM
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Not cheap!
The part number is 44205PA000 and is $275.00 plus shipping from subaruparts.com and $350.00 from your dealer. Part #2 in the diagram.  Easier to get another used resonator and cut the pipes at either end of the resonator and weld it back in. Or get another resonator, such as magnaflow or Aero Turbine and put it in the same place,. .
__________________
. Subaru Ambassador 1996 Polo Green LSi #216..138,100 miles...SOLD JFICX8659TH100216.....Date of Manufacture: November 16, 1995..... Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan In-Service Date: January 2, 1997 "The Pristine Green Polo Machine” First Polo Green on the Network First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000) First 5000K HID factory fog lights (2007) First SVX JDM BBS wheels on a USDM SVX (2013) HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler. R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016 2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback  2007 Mazda Miata MX-5 PRHT...102,000 miles. Plenty of parts, service and windshields.  4th Registered Network member —2/21/2001 My NEW locker..I...My Email..I..Wikipedia/SVX . .
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