Warped Exhaust Manifold on 2007 Expedition
#1
Warped Exhaust Manifold on 2007 Expedition
After traveling from Texas to Orlando while pulling our travel trailer, my Expedition stalled as we pulled up to the "Welcome to Walt Disney World" gate. We waited a about 10 minutes, started it up and it ran just fine all the way to our campsite, except now there was a sort of ticking sound coming from the right wheel well area. I wasn't sure what it was at first. When it would sit overnight, it would tick loudly at startup and go away after about 15 seconds. We used it that way for the 2 weeks we were there never having another problem until we were on our way home where it stalled again once for about ten minutes.
Later I figured out that the passenger side exhaust manifold was warped. This was causing the exhaust to leak, which caused the under hood temperature to get so hot that it was boiling the fuel in the fuel rails (similar to "vapor lock" in old carbureted cars). That's why it would run okay after cooling off for a few minutes. After much research, I decided to replace both of the warp prone cast iron manifolds with stainless steel, ceramic coated Gibson headers (model GP218S-C). I picked it up today and the leak is gone and it's running better than ever. I'm not expecting a big difference in performance or MPG's, but any improvement will be welcome.
Almost there...
All set up
Passenger side header
Driver side header
Later I figured out that the passenger side exhaust manifold was warped. This was causing the exhaust to leak, which caused the under hood temperature to get so hot that it was boiling the fuel in the fuel rails (similar to "vapor lock" in old carbureted cars). That's why it would run okay after cooling off for a few minutes. After much research, I decided to replace both of the warp prone cast iron manifolds with stainless steel, ceramic coated Gibson headers (model GP218S-C). I picked it up today and the leak is gone and it's running better than ever. I'm not expecting a big difference in performance or MPG's, but any improvement will be welcome.
Almost there...
All set up
Passenger side header
Driver side header
Last edited by NLPRacing; 08-06-2014 at 04:10 PM. Reason: Grammar
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He charged me about $750 just for labor, which is the same as it would of been to replace both manifolds. I may of been able to get it done cheaper, but I trust my mechanic and he always stands behind his work. I've been using him for over 20 years.
#7
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#8
Thanks! I thought this might be a little more involved than throwing a set onto an old Mustang... that just took a few wrenches and a few beers!
#9
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graypatrick093
2007 - 2014 Expedition & Navigator
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07-22-2015 11:20 AM