Hey folks, it's me again. A little while after getting my new exhaust setup (which I love ) I have noticed this kind of annoying rattling/gargling noise.... I ignored it for a while...didn't really pay a lot of attention to it. The other day I started trying to diagnose what I do or when it makes it rattle, and I found out it's every time I hit 800 rpm...pulling out somewhere like my garage and leaving for school it rattles. Last night I had to wait for a train and I sat their and revved it slowly and every time it hit 800 RPM it rattled. Any ideas??? I've heard stories about mechanics leaving something in the exhaust or something on accident...who knows lol.
Thanks for the suggestions
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07 Grabber V6 Appearance:Pony Package Mach1 look alike sorta Performance:Straight Pipes into Shelby GT500 Mufflers Future:CAI+tunes;4.10's t-lok on 7.5;MAC Longtubes;Sequentials and Quarter Louvers The Greek Definition of Happiness: The full use of your powers along the lines of excellence
Put it up on ramps, pin something to the accelerator to hold 800 rpms (with the car in park and scotched) and climb under to diagnose your problem. Probably vibrating against an exhaust hanger or a cat shield if your car has those. Problem solved.
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Your typical Terminator with all the usual mods Ford meant for you to do right after you left the showroom.
ive had this problem, if you get a hand held tuner and set the idle rpms above 1k it will go away. if that doesnt solve it it might be the exhaust hangers rubbing up against some metal underneath the car which was also a problem i had untill i took it back to the shop and got it fixed.
Loose exhaust somewhere.I bet if the car is in park and at 800 rpm it is not rattling. When the motor torques while in gear , it moves and opens the gap. Thats my bet
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2006 Mustang GT. CDC classic chin spoiler,Off road x , FRPP GTA axlebacks,Tunable Induction CAI,SCTtuner. FRPP 3.73 gear,Rear window louver,Qtr window louvers.CDC shaker hood,M&H drag radials, and ZEX 125 shot nitrous for insurance!
Best ET to date- 11.89 @ 114 mph
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No more Nitrous all motor now.Don't ask.
KEEP DRIVING THAT PRIUS.....WE NEED THE GAS
Last edited by blk281gt; 2 Weeks Ago at 07:46 PM.
Reason: addition
if you get a hand held tuner and set the idle rpms above 1k it will go away
There is no need to raise your rpms. The beauty of these cars is their driveability. Like blk281gt said, you probably need to have the car under load to recreate the problem. Check all the hangers and fittings. You may have a hanger that is actually making contact with the frame of the car. Check for scratches around the muffler hangers. They may only make contact when the car twists or the hangers expanded after heating up.
Right there with ya on the low rpm rattle......pretty friggin annoying but I have been pretty more friggin lazy and not done **** about it yet......this winter.....maybe.
Had the same thing check out the hanger on the exh and u will see it it rubbing on the frame mine did it when i got my exh and put in reverse or take off sounded like rocks in the heat shield
Loose exhaust somewhere.I bet if the car is in park and at 800 rpm it is not rattling. When the motor torques while in gear , it moves and opens the gap. Thats my bet
it actually rattles at idle too, which i thought was weird.
I don't have a way of getting it up in the air to check it out by myself, which sucks! Oh well, I'll check it out...sometime
I figured it was like a hanger rubbing against something, just needed some validation, thanks guys
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07 Grabber V6 Appearance:Pony Package Mach1 look alike sorta Performance:Straight Pipes into Shelby GT500 Mufflers Future:CAI+tunes;4.10's t-lok on 7.5;MAC Longtubes;Sequentials and Quarter Louvers The Greek Definition of Happiness: The full use of your powers along the lines of excellence
my 07 has been doing this for the past 30k miles or so. im hoping changing the exhaust will fix it but i believe its a baffle inside the muffler making the noise.
Rattling at 800 RPM coming from exhaust? 
) I have noticed this kind of annoying rattling/gargling noise.... I ignored it for a while...didn't really pay a lot of attention to it. The other day I started trying to diagnose what I do or when it makes it rattle, and I found out it's every time I hit 800 rpm...pulling out somewhere like my garage and leaving for school it rattles. Last night I had to wait for a train and I sat their and revved it slowly and every time it hit 800 RPM it rattled. Any ideas??? I've heard stories about mechanics leaving something in the exhaust or something on accident...who knows lol. 
all motor now.Don't ask.
