Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 3.8 & 4.2L V6
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 12-04-2010, 10:40 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
Coolant Leak: Is it the intake manifold gasket?

This 4.2L is in a 2001, 2wd, F-150, that I bought new. It has 130+K miles.
About 500 miles ago I noticed the reservoir was about 1/4 inch low so I added 1/4 inch - didn't smell or notice any leaks. Tailpipe was wet but not unusually.
Engile idle has been a little strange lately (going up and down slightly for no apparent reason).
About 100 miles ago I found the coolant reservoir dry. So I filled it up. Still cant see or smell any leaks (except now the tailpipe seems more wet than usual).
Yesterday, when I jacked the truck up to change oil and rotate tires - a puddle about 8 inches in diameter formed under the end of the tailpipe and now there is liquid leaking (a bigger puddle from a rust spot I guess) at the back of the muffler. These puddles seem to be just water - no green color or coolant odor.
Does this mean the intake manifold gasket(s) needs replacement?
Is this something I can do myself or should I take it to a shop? (I have rebuilt engines before but on much older vehicles).
How much can I expect to pay to have it done?
I need to make a 500 mile run up north pulling an inclosed utility trailer - will the engine be roached if I don't fix it first? (There might be a heated garage to use up there).
Sorry for rambling on. Any help is appreciated!
Reply With Quote
  #2 (permalink)  
Old 12-04-2010, 02:04 PM
BrianA's Avatar
BrianA BrianA is offline
Postmaster
 
Join Date: Aug 2001
Location: Trussville, Alabama
Posts: 4,531
BrianA has a great reputation on FTE.BrianA has a great reputation on FTE.BrianA has a great reputation on FTE.BrianA has a great reputation on FTE.
Based on what you describe, a leaking lower intake manifold gasket is a strong possibility.
The external puddle may or may not be related.

One way to check is drain the oil and look for signs of contamination by coolant. The coolant/water can turn the oil milky brown if there is enough and it gets emulsified.

IF YOU WANT TO You can touch your finger in the puddle under the exhaust and then touch it to your tongue. If it tastes sweet, it is coolant.
Condensation water is kinda common when the weather turns cold, so the taste test should help you there.

Yes, you can do the work yourself if your are a reasonably skilled mechanic. It ain't rocket science.

I had to have the work done on my 2000 model way back when. (It was at 150K when mine failed). I paid to have it done due to timing and logistics. Pricing could be all over the map, but I'd expect something in the $350 - $450 range, parts and labor.

One word of caution, if it is a leaking LIM gasket, you could go out at any point in time and attempt to start the truck and ruin the engine in the process. If coolant leaks into a cylinder that happens to be ready to start the compression stroke, well.... water doesn't compress very much and you can easily bend a rod.

Not a problem as long as the engine is running. But each start up might be the last.

Here is my story from Feb 2005.
http://www.ford-trucks.com/forums/34...hydrolock.html

best of luck with it!
__________________
Brian A
If it ain't broke, don't fix it.
FTE Moderator - 3.8 / 4.2 forum
Reply With Quote
  #3 (permalink)  
Old 12-05-2010, 08:13 PM
BlueOvalFitter's Avatar
BlueOvalFitter BlueOvalFitter is offline
Posting Guru
 
Join Date: Aug 2002
Location: Cajun Country
Posts: 1,973
BlueOvalFitter is gaining momentum as a positive member of FTE.
Exclamation

Everything Brian said is correct.If you do decide to change the oil do it when the engine is cold.If coolant is leaking by the LIM gaskets the coolant will settle at the bottom of the oil pan.Remove the drain plug very slowly letting the oil just seep out.If there is coolant in it you will see it immediately!
__________________
2007XL R/Cab,4.2 V6,auto,cruise control
The anticipation of death is worse then death itself!
Reply With Quote
  #4 (permalink)  
Old 12-06-2010, 09:13 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
I had just changed the oil and didn't notice any coolant but the old oil was going directly into an enclosed drain pan. It will be worth it to loosen the drain plug a little, in the morning, before starting the truck - as you suggest.
Thanks for the great advice!
Reply With Quote
  #5 (permalink)  
Old 12-13-2010, 09:05 PM
red01 red01 is offline
New User
 
Join Date: Oct 2004
Posts: 18
red01 is starting off with a positive reputation.
same symtoms I had. check your heater hoses where they conect to the alumium lower intake, mine is leaking there. its a steel nipple with a 90deg elbow by the thermastat housing. its pressed in I plan on drilling mine out and threading the hole and using a brass nipple.
Reply With Quote
  #6 (permalink)  
Old 12-16-2010, 08:33 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
Quick question for red01 - were you seeing coolant at the fitting you mentioned? Cause I'm not seeing evidence of a leak there.
I made the 500 mile trip with no problems. I brought 3 gallons of new coolant with me thinking that I would be adding it at every rest stop. Surprisingly to me - it didn't loose a drop. After it sat a day or two at the end of the trip I noticed the level was slightly lower. Now, for the first time, the Check Engine Light is on. My brother is coming over tomorrow with his code checker and a coolant system pressure gauge. Hopefully by then I'll have a spot in the garage and the kerosene heater fixed. It's a whopping 6 degrees out there this morning.
Reply With Quote
  #7 (permalink)  
Old 12-16-2010, 08:37 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
Just wanted to say thanks to "BrianA" for the link. It was very helpful reading!
Reply With Quote
  #8 (permalink)  
Old 12-18-2010, 08:38 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
Just trying to find out as much information as I can before tearing into this problem.
The code reader came up with P0171 & P0174 (lean bank 1 and lean bank 2).
My thinking now is that coolant is used to somehow heat the intake air. And that somehow this coolant is getting into the exhaust and corrupting the O2 sensors. I'm going to try and find a schematic of the coolant flow that might show where this leak is occuring.
Reply With Quote
  #9 (permalink)  
Old 01-27-2011, 08:14 AM
86f350's Avatar
86f350 86f350 is offline
Senior User
 
Join Date: Oct 2007
Location: Whitestown, IN
Posts: 369
86f350 is starting off with a positive reputation.
Have you replaced your intake manifold gasket yet ? If so how long did it take ? Parts should be less than $100 for everything including new isolator bolts.
Reply With Quote
  #10 (permalink)  
Old 01-27-2011, 10:42 AM
Lennyg Lennyg is offline
Freshman User
 
Join Date: Aug 2007
Posts: 45
Lennyg is starting off with a positive reputation.
No, I haven't dug into it yet for two reasons. I'm waiting for my finances to catch up and also - it hasn't lost any (noticeable) coolant for quite some time. I know there is still a problem because occasionally the idle will raise and lower for no aparant reason. I've driven almost a hundred (city) miles since resetting the check engine light and it has remained off.
Reply With Quote
Old 01-27-2011, 10:42 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 3.8 & 4.2L V6

Tags
2001, 302, aut, coolant, coolent, expedition, f150, fix, gasket, intake, leak, manifold, reservoir, smell, wather

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 06:40 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup