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Thread: Seafoam to find an exhaust leak?
02-19-2012, 07:30 PM #1
Seafoam to find an exhaust leak?
I've been dealing with what seems like an exhaust leak, but it 's hard to track down and is only audible under load.
Flipping around the web I've seen ideas such as stuffing a towel in the tailpipe, but with a crossover in the exhaust I don't think it would work as good. Another idea was using Seafoam and following the white smoke. This seems like it might be the easiest way to track it down?
2003 DSG Cobra Coupe
Borla Catback, Bassani catted X, Bassani mid-length headers, Spec Stage 3+, Fidanza aluminum flywheel, 26 spline upgrade, Accufab TB, PHP Intake, Tri-Ax, 2.80" Upper, XCal 3 - RET Custom Tune
484 rwhp/479 rwtq
Suspension: 00R Brembos, Maximum Motorsports 375/575 Coil Overs, C/C Plates, STB, Tubular A-Arms, IRS Urethane, Alum Rack Bushings, Alum Diff Bushings, MM tuned Struts/Shocks, K Member Brace, Full Length Subs, Steeda IRS brackets/diff brace, CCW 550s - 18x9.5, 18x11
2007 Tungsten Grey Shelby GT500 Coupe
2.65" Pulley, FRPP Intake, FRPP Handling Pack, Steeda LCAs, MM Panhard Bar, C/C plates, Alum DS, RET Tune
2013 Focus ST
02-19-2012, 08:21 PM #2
sounds like exhaust manifold gasket or if u have lt's header gaskets. I bough a 89 ford bronco and had the same problem. I could only hear the leak under load, 1200-1400 rpm. I thought maybe the manifold was cracked since its such a old vehicle. I pulled the manifolds off and sure enough the bolts were loose and the gaskets were destroyed.
I dont think the sea foam would be the greatest idea since that stuff is pretty nasty , it really smokes you out. Dont want u to be breathing that stuff looking for a leak under the car.. if u do wind up doing that make sure the car is outside very well vented and not in the garage.
02-19-2012, 08:29 PM #3
02-19-2012, 08:32 PM #4
- Join Date
- December 2010
Under load it's usually header/manifold gaskets... I've pulled mine twice for the same reason... stupid Kooks gaskets.03 Cobra Redfire Coupe Dearly missed
02-19-2012, 08:42 PM #5
02-19-2012, 08:45 PM #6
My guess is it's the damn header gaskets as well. In my last project we found the #1 primary very loose. Tightened it up but the gasket is probably dead already.
This is a nice setback while my Whipple sits lonely in the garage.
Car has Bassani headers btw.
02-19-2012, 08:53 PM #7
02-19-2012, 09:20 PM #8
02-19-2012, 09:47 PM #9
Dwight, you know a good spot on these motors to hook an engine support brace to drop the K?
02-19-2012, 09:52 PM #10
02-19-2012, 10:00 PM #11
02-19-2012, 10:03 PM #12
Noise under load is normally header gaskets. However when it's just a pin hole in the exhaust you can start the car cold in the garage and let it idle for a few minutes, garage door open of course. Then look under and you'll see a few droplets of water on the ground where the leak is at.03 Cobra
2.9 Whipple crusher @ 27.5 PSI, return fuel system, fore hat, fuel rails, ID 1000 injectors, PTFE teflon fuel hose -10 supply, -8 return, Fore FPR, GT500 slot MAF
Tuned myself with SCT PRP
-19cc diamond pistons, 26 spline, RXT twin disk, McLeod steel retainer, fiore firewall adjuster, steeda quick release quadrant, MGW shifter, N2MB WOT shift box, billet flow idlers, LFP heat exchanger, Bassani catless X, Borla Stingers, DynoJet wideband, speedhut gauges with speed of sound pods. MM Caster/Camber plates. Hood Shocks. 170F thermostat.
Water methanol injection
Zex 100 shot nitrous
J&S Vampire anti knock
MD Racing Lean Protection Module
Flex Fuel on E85 at times
17x10.5 - MT ET Streets
IRS brace after cracked diff cover.
Window tint, magnetic oil plug & tons of other misc BS I'm not gonna list
Lean Protection Module - Group Buy Thread
05 Tundra 4.7 quad cam
98 Civic Precision turbo, built forged motor 9.0:1
07 BMW 335xi twin turbo AWD
02-19-2012, 10:16 PM #13
02-19-2012, 11:24 PM #14
02-20-2012, 10:34 AM #15
Time for some Stage 8 Locking header bolts lol2003 SVT 5.4L Turbo / Auto / Built Cobra
2003 SVT WHIPPLE COBRA On the Bottle ( SOLD )
2013 Ford Fusion 1.6 Eco boost (daily)
2007 Ford Explorer EB V8 (wifey)
02-20-2012, 10:59 AM #16
and Remflex gaskets.. I have them on my bassani headers for a few years now with no issues! With the tranny still installed, I just hooked the support brace to the studs almost at the top of the timing cover. You could also do a idler pulley on the driver side and a tensioner bolt on the passenger. Seen and done it both ways.2012 Super Crew Ecoboost F-150 FX4
2003 DSG Cobra #4107 of 8394
1996 Mystic Cobra #1837 of 2000 SOLD
02-20-2012, 01:40 PM #17
02-20-2012, 11:38 PM #18
02-29-2012, 11:23 PM #19
- Join Date
- April 2011
- New Jersey
How hard is it to get to the bolts and replace the gasket its not the 15 hour job it took me to get the damn headers on is it?
03-01-2012, 01:10 AM #20
03-05-2012, 03:40 PM #21