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#4084892 - 11/18/20 03:55 PM Can't find passenger side exhaust leak
YoungP71dude Offline
Member

Registered: 08/16/19
Posts: 147
Loc: Charlotte, NC
Hey y'all,

As the title says, there's an exhaust leak on the passenger side that's audible inside the cabin but I cannot find it. I'm using the vacuum and soapy water method to find it, but I see no bubbles on the manifold and downpipe. I've already stacked a bunch of muffler cement on the downpipe flange because that's a hotspot for leaks. Anyone have input on this?

Thanks.
_________________________
2004 Ford Crown Victoria P71 - 8/12/2019-present - Teenager-owned and maintained Ex-Berkeley Country Sheriff Car w/ 84,000 miles
DIY 2.5" Catback Dual Exhaust w/ Straight-through Mufflers & DC Sports Resonated Tips; 3.73's and a paint job coming soon

The Crown Vic - America's Sedan, the 4-Door Mustang, the Truck with a Trunk, the Submarine of the Road, and unpredictable when put in the hands of a 15-year old.

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#4084898 - 11/18/20 04:53 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7259
Loc: MA
If it's audible inside the passenger cabin, it should be audible from under the car. Many times you can also feel the leak with your hands. Maybe try a mechanic's stethoscope...
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4084902 - 11/18/20 05:15 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
YoungP71dude Offline
Member

Registered: 08/16/19
Posts: 147
Loc: Charlotte, NC
It's worth noting that it's only audible when you get on the throttle. It's pretty hard feeling out the leaks now as the season gets colder.
_________________________
2004 Ford Crown Victoria P71 - 8/12/2019-present - Teenager-owned and maintained Ex-Berkeley Country Sheriff Car w/ 84,000 miles
DIY 2.5" Catback Dual Exhaust w/ Straight-through Mufflers & DC Sports Resonated Tips; 3.73's and a paint job coming soon

The Crown Vic - America's Sedan, the 4-Door Mustang, the Truck with a Trunk, the Submarine of the Road, and unpredictable when put in the hands of a 15-year old.

Top
#4084910 - 11/18/20 06:11 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7259
Loc: MA
You should be able to hear a leak with a mechanic's stethoscope, even if it's faint. Check around the exhaust manifold studs, too.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

Top
#4085000 - 11/19/20 04:44 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
YoungP71dude Offline
Member

Registered: 08/16/19
Posts: 147
Loc: Charlotte, NC
Harbor Freight is out of stock with mechanic's stethoscopes today, will do my best to see what I can do until I can get one.
_________________________
2004 Ford Crown Victoria P71 - 8/12/2019-present - Teenager-owned and maintained Ex-Berkeley Country Sheriff Car w/ 84,000 miles
DIY 2.5" Catback Dual Exhaust w/ Straight-through Mufflers & DC Sports Resonated Tips; 3.73's and a paint job coming soon

The Crown Vic - America's Sedan, the 4-Door Mustang, the Truck with a Trunk, the Submarine of the Road, and unpredictable when put in the hands of a 15-year old.

Top
#4085038 - 11/19/20 08:50 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1644
Loc: Cleveland, OH
A long screwdriver works pretty well. Just don't put the pointy end in your ear.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 54K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

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#4085042 - 11/19/20 09:04 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
CrystalPistol Offline

Over the Hill

Registered: 10/16/01
Posts: 2311
Loc: The Shenandoah Valley of Va.
I have a mechanic's stethoscope, but my favorite listening tool is a hickory riot baton. It don't dig into my ears 'cause the rubber ear cushions pieces are old, hard, & rotten … 'cause it don't have any. laugh

I do not let it hit a fan. wink


Edited by CrystalPistol (11/19/20 09:08 PM)
_________________________

2001 MercGM since 2001, 93K miles, Addco F&R, Bilstein HDs, J-mod, factory duals, Reese Hidden Hitch, AirLifts, Weathertech, XM, easy on gas, 17x7s with Goodyear RS-As make a smooth ride. All as of January 2020




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#4085048 - 11/19/20 09:30 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1644
Loc: Cleveland, OH
I've only ever been on the wrong end of those.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 54K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

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#4085054 - 11/19/20 11:31 PM Re: Can't find passenger side exhaust leak [Re: Old_Guy_Stu]
CrystalPistol Offline

Over the Hill

Registered: 10/16/01
Posts: 2311
Loc: The Shenandoah Valley of Va.
Originally Posted By Old_Guy_Stu
I've only ever been on the wrong end of those.
Surely, thee jests. smile

BTW, nice looking '88.


Edited by CrystalPistol (11/19/20 11:32 PM)
_________________________

2001 MercGM since 2001, 93K miles, Addco F&R, Bilstein HDs, J-mod, factory duals, Reese Hidden Hitch, AirLifts, Weathertech, XM, easy on gas, 17x7s with Goodyear RS-As make a smooth ride. All as of January 2020




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#4085068 - 11/20/20 06:02 AM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1644
Loc: Cleveland, OH
Sadly, not. Some of y'all are way too happy with those things. Glad you've found a peaceful use for it.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 54K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

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#4085078 - 11/20/20 08:07 AM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1331
Loc: Oak Creek, WI
Rather than a stethoscope that's terrific for finding "hard" mechanical noises, I prefer to use a length of hose or vacuum line for exhaust leaks. It's much more sensitive at a distance, which allows you to easily find your way to the leak.

I'd start by focusing your attention on the manifolds and EGR tube. Notorious failures.
_________________________
2011 Crown Victoria LX - purchased @ 37k miles
currently @ 92k miles
Dark Toreador Red Metallic exterior
Medium Light Stone interior

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#4085102 - 11/20/20 01:28 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
YoungP71dude Offline
Member

Registered: 08/16/19
Posts: 147
Loc: Charlotte, NC
I took up 2011LX's advice on using a hose to listen for leaks. I discovered that it's the manifold-to-head connections that are slightly leaking, I hear lots of pinging sounds when I put the hose near them. It was never the flange-to-downpipe. Will seal those up when the car cools down along with the 12 separate leaks surrounding my band clamps under the car and the darn driver-side flange.
_________________________
2004 Ford Crown Victoria P71 - 8/12/2019-present - Teenager-owned and maintained Ex-Berkeley Country Sheriff Car w/ 84,000 miles
DIY 2.5" Catback Dual Exhaust w/ Straight-through Mufflers & DC Sports Resonated Tips; 3.73's and a paint job coming soon

The Crown Vic - America's Sedan, the 4-Door Mustang, the Truck with a Trunk, the Submarine of the Road, and unpredictable when put in the hands of a 15-year old.

Top
#4085104 - 11/20/20 02:58 PM Re: Can't find passenger side exhaust leak [Re: 2011LX]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7259
Loc: MA
Glad you found it (them)!

Originally Posted By 2011LX
I prefer to use a length of hose or vacuum line for exhaust leaks. It's much more sensitive at a distance, which allows you to easily find your way to the leak.
That's a terrific suggestion...thanks!
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

Top
#4085106 - 11/20/20 03:32 PM Re: Can't find passenger side exhaust leak [Re: YoungP71dude]
quedog07 Offline
n00b

Registered: 09/26/19
Posts: 12
Loc: Memphis, TN
I got an 04 with the same problem! intake or exhaust manifold to header?
_________________________
2003 P71-Big Red
170k miles
3.27 Trac-Lok
Pioneer receiver, door,& back speakers
LED Taillights

2004 P71-Merlot
145k miles
24" DUBs
Pioneer Receiver, door & back speakers
2-Fubr 12s
LED Taillights


FIETTS

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#4085146 - 11/20/20 10:13 PM Re: Can't find passenger side exhaust leak [Re: quedog07]
YoungP71dude Offline
Member

Registered: 08/16/19
Posts: 147
Loc: Charlotte, NC
Originally Posted By quedog07
I got an 04 with the same problem! intake or exhaust manifold to header?

Right where the exhaust manifold bolts to the head. The surface area around it has small leaks. I'm not wanting to reseat it because 1) I hear taking them off is a pain in the butt and 2) chances are my studs are pure rust at this point. I'll be doing my best to apply some muffler cement around the area.
_________________________
2004 Ford Crown Victoria P71 - 8/12/2019-present - Teenager-owned and maintained Ex-Berkeley Country Sheriff Car w/ 84,000 miles
DIY 2.5" Catback Dual Exhaust w/ Straight-through Mufflers & DC Sports Resonated Tips; 3.73's and a paint job coming soon

The Crown Vic - America's Sedan, the 4-Door Mustang, the Truck with a Trunk, the Submarine of the Road, and unpredictable when put in the hands of a 15-year old.

Top

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