Best way to find exhaust leak? - F150online Forums



Best way to find exhaust leak?

Reply
 
 
  #1  
Old 04-04-2011, 04:09 PM
Senior Member
Thread Starter
 
Join Date: Dec 2006
Location: SOVA
Posts: 267
Best way to find exhaust leak?

Ive got an exhaust leak on my truck and cant seem to figure out where from. The motor and cats were replaced recently. The noise is most noticible when starting the truck with the window open. I would think it would be the exhaust manifold as that should have just been bolted down tight with a new gasket. Plus it doesnt sound like a manifold leak, its not really audible in the cab like manifold leak ive heard. So whats the easiest way to determine the leaks source?

Thanks in advance for any help, i hate an exhaust leak. Makes me feel like im driving a old beater truck
Reply With Quote
  #2  
Old 04-04-2011, 06:28 PM
Senior Member
 
Join Date: Aug 2008
Location: Douglasville GA
Posts: 4,778
Look for black marks.
Reply With Quote
  #3  
Old 04-04-2011, 11:52 PM
Senior Member
 
Join Date: Oct 2009
Location: Missouri
Posts: 6,172
Start the truck cold, and feel around all the seams. You will feel a leak. Black marks will also show.
Reply With Quote
  #4  
Old 04-05-2011, 01:23 PM
Senior Member
 
Join Date: Dec 1999
Location: California
Posts: 1,259
Yup, black soot marks and with the truck running, have someone place a thick rag/towel over the tailpipe restricting the flow...the sound will pop out (so to speak)
Reply With Quote
  #5  
Old 04-05-2011, 06:25 PM
Senior Member
 
Join Date: Apr 2007
Location: Ohio
Posts: 517
Check the bolts on the manifold again. For headers at least, you snug them up after install, drive i little bit and get everything seated, then tighten them down to spec.
Reply With Quote
  #6  
Old 04-05-2011, 06:48 PM
Senior Member
 
Join Date: Jan 2007
Location: Marysville, Washington
Posts: 328
Hold a piece of pvc pipe or hose up to your ear and move the other end around where you suspect the leak may be.
Reply With Quote
  #7  
Old 04-06-2011, 12:50 PM
Senior Member
 
Join Date: Mar 2007
Location: NC
Posts: 431
Hook up a shop vac or blower to your exhaust pipe and turn it on. The engine is off. Spray a soapy water around every possible leak point. That's how I found my manifold gasket leaking.
Reply With Quote
  #8  
Old 04-06-2011, 01:44 PM
Technical Article Contributor
 
Join Date: Oct 2005
Location: MI
Posts: 25,637
Quote:
Originally Posted by jaws12 View Post
Hook up a shop vac or blower to your exhaust pipe and turn it on. The engine is off. Spray a soapy water around every possible leak point. That's how I found my manifold gasket leaking.
Smart guy

That's what works best. I use compressed air myself @ about 15-20 lbs, - only because I have the fitting reducer for the tailpipe. I know those Rigid shop vacs will plug right tho lol.

Yep, soapy water on the seams reveals all.
Reply With Quote
  #9  
Old 05-31-2011, 08:47 AM
Member
 
Join Date: Apr 2011
Posts: 38
Quote:
Originally Posted by jbrew View Post
Smart guy

That's what works best. I use compressed air myself @ about 15-20 lbs, - only because I have the fitting reducer for the tailpipe. I know those Rigid shop vacs will plug right tho lol.

Yep, soapy water on the seams reveals all.
I'm suspecting a small exhaust leak, because after driving a while with blower on Low I'm getting a headache. With blower on High it doesn't bother me. My passenger side manifold has bolts into the head instead of studs and nuts, so it appears someone had some problems with it at some point. I can't hear any obvious puffing. I tried feeling around the manifold with the truck running, and I think I can feel a small leak, but it's hard to tell with all the air flow in that area with the fan running. I tried testing the air for CO with a battery powered home CO monitor, but it didn't show any reading above zero, so apparently it isn't really bad.

jbrew - Where did you get the fitting to connect the compressed air to the tailpipe? This seems like a good way to get the exhaust system pressurized. Also, I have a dual exhaust - any good way to plug the other side? I was thinking of using a big sponge with a plastic bag wrapped around it.
Reply With Quote
 
 
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
KlondikeF150
Pre-1997 Models
9
08-11-2015 02:02 AM
Ttaylor009
Exhaust & Intake Systems
2
08-04-2015 09:51 PM
carid
Site Vendor Specials & Classifieds
0
07-17-2015 10:25 AM
CKAL
1997 - 2003 F-150
4
07-15-2015 01:30 PM
rusty1971
1997 - 2003 F-150
18
07-09-2015 08:30 PM


Thread Tools
Search this Thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -4. The time now is 01:15 PM.