Head vs Intake 2003 Expedition 5.4 - Ford Truck Enthusiasts Forums



1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Head vs Intake 2003 Expedition 5.4

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 12-27-2017, 02:52 PM
FlagstaffExpedition FlagstaffExpedition is offline
New User
Thread Starter
 
Join Date: Dec 2017
Posts: 2
FlagstaffExpedition is starting off with a positive reputation.
Head vs Intake 2003 Expedition 5.4

Forum Newbie: I am getting ready to dig into the top end of my wife's 03 Expedition and I want to avoid doing the heads if I can. How can I be sure it's NOT THE HEADS?
1. Runs perfectly. Purrs like a kitten, no codes. Good power.
2. Blew coolant out of the overflow twice. Cap replaced both times. The temp sensor would spike for only a few seconds, it would blow out the cap and the temp went right back to normal and it would run fine until it completely cooled. Seemed like an air bubble, probably at the now leaking crossover.
3. I can see a leak on the passenger side of the crossover that is leaking into the plugs and into the valley. The heater hose in the valley looks OK. The firewall heater hose connections look pretty good, but there could be some water staining on the firewall, hard to see.
4. ***** Coolant leak above starter/passenger exhaust manifold area. Can't see where it's coming from even with an endoscope camera.
5. Oil is clear. Coolant is clear and no bubbles when running. I did the chemical test on the overflow tank and it came back non-conclusive. Color turned neutral, but something caused it to blow back through the cap.
6. I am losing some coolant and some oil. For the oil, she has 204,000 miles, so it could just be blow by burning and not a new symptom.
7. Exhaust has some white smoke on our cold mountain mornings, but it goes away fast and no sweet smell. Only some water condensation, no coolant.
Bottom line: no direct oil or coolant head symptoms. I was thinking of using an old pressure cap and attaching a hose fitting and pressurizing the system to try to find the leaks. I would really appreciate any help sorting HEAD vs INTAKE! Thanks in advance!
Greg in Flagstaff
Reply With Quote
  #2  
Old 12-29-2017, 02:17 PM
Skauber Skauber is offline
Posting Guru
 
Join Date: Dec 2014
Posts: 1,552
Skauber is gaining momentum as a positive member of FTE.Skauber is gaining momentum as a positive member of FTE.
A known issue is cracking on the intake if it has the plastic intake. It cracks around the aluminum crossover where you indicate you have a leak. This requires you to replace the entire intake, though the new ones from Ford are supposed to be improved.

As for pressure in the system, not sure what this comes from. If it doesn't have any other signs of head gasket issues, I would start by fixing the known issue, which is the leak around the crossover.
Reply With Quote
  #3  
Old 12-29-2017, 07:14 PM
FlagstaffExpedition FlagstaffExpedition is offline
New User
Thread Starter
 
Join Date: Dec 2017
Posts: 2
FlagstaffExpedition is starting off with a positive reputation.
Thanks Skauber! That's good advice. Fix what's broken! Plus when I get the intake off, I can see all those back heater hoses. Thanks again! g
Reply With Quote
  #4  
Old 01-17-2018, 12:35 AM
AllFordID AllFordID is offline
New User
 
Join Date: Apr 2003
Location: Idaho
Posts: 11
AllFordID is starting off with a positive reputation.
Quote:
Originally Posted by Skauber View Post
A known issue is cracking on the intake if it has the plastic intake. It cracks around the aluminum crossover where you indicate you have a leak. This requires you to replace the entire intake, though the new ones from Ford are supposed to be improved.

As for pressure in the system, not sure what this comes from. If it doesn't have any other signs of head gasket issues, I would start by fixing the known issue, which is the leak around the crossover.
Agree with this statement. My '01 started leaking there...slowly at first. Then one day the whole thing went and water sprayed everywhere. Replaced with Dorman aftermarket intake (plastic design). Now 100k miles and still going strong.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help! 6.4 powerstroke has lots of blow by and is eating oil CISKOWSKI_21 6.4L Power Stroke Diesel 16 10-09-2017 10:27 PM
Time to eat some crow. I had boost leaks. Listen to people on the forum brandon_oma#692 1999 - 2003 7.3L Power Stroke Diesel 40 08-19-2017 11:03 PM
Found That Pesky Coolant Leak! kr98664 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 21 06-19-2017 06:03 PM
overheating and bubbles in overflow bsetbuilding Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 10 12-12-2016 04:05 PM
Newb to e250. oh boy. (Brown) Trouble overflowing. GreenMM 1968-2013 Full Size Vans 43 04-21-2016 10:15 AM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 10:44 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.