4x4 completely out. Could it be simple?
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Senior User
Joined: Dec 2011
Posts: 107
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From: Texas
4x4 completely out. Could it be simple?
My 2001 Excursion's 4x4 low and high do not work at all. Any chance it could be a simple issue? I bought the vehicle last spring and didn't notice any issues until it started to snow.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
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From: Houston, Texas
When you have a A/C on, does it default to defrost?
If so, you have a vaccum leak at one of the hubs and your lines may need to be replaced.
You should also consider greasing your hubs as this is a commonly neglected maintenance item. Riffraff Diesel sells a fitting that works perfectly and can save you the cost of having to replace hubs.
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
You may not have to go this far, but just in case: Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
If so, you have a vaccum leak at one of the hubs and your lines may need to be replaced.
You should also consider greasing your hubs as this is a commonly neglected maintenance item. Riffraff Diesel sells a fitting that works perfectly and can save you the cost of having to replace hubs.
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
You may not have to go this far, but just in case: Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
Logistics Pro
Joined: Jan 2014
Posts: 3,595
Likes: 17
If you're getting the lights functioning properly...
Could also be a vacuum leak, front hubs are ESOF setup and the lines are just standard soft line rubber that'll deteriorate over time.
Greasing up the hubs wouldn't be a bad idea as they tend to get forgotten and neglected. Clay at RR sells a nice adapter for greasing simplicity.
Senior User
Joined: Aug 2014
Posts: 138
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Does it switch to LOW range but not engage the front axle, or does the transfer case not respond at all? (Mine would shift to low range but not engage the front axle... the new vacuum solenoid fixed that in about 2 minutes of work.)
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Thread Starter
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Senior User
Joined: Dec 2011
Posts: 107
Likes: 2
From: Texas
When you have a A/C on, does it default to defrost?
If so, you have a vaccum leak at one of the hubs and your lines may need to be replaced.
You should also consider greasing your hubs as this is a commonly neglected maintenance item. Riffraff Diesel sells a fitting that works perfectly and can save you the cost of having to replace hubs.
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
You may not have to go this far, but just in case: Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
If so, you have a vaccum leak at one of the hubs and your lines may need to be replaced.
You should also consider greasing your hubs as this is a commonly neglected maintenance item. Riffraff Diesel sells a fitting that works perfectly and can save you the cost of having to replace hubs.
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
You may not have to go this far, but just in case: Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
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Senior User
Joined: Dec 2011
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From: Texas
It doesn't appear to change/engage at all, but I'll investigate further.
Laughing Gas
Joined: Sep 2012
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From: Northcentral Wisconsin
The heater defaulting to defrost could be a vacuum leak at the hubs when you engage the 4 wheel drive. Have you tried manually locking the hubs? It sounds like you have a vacuum leak for sure. If the transfer case isn't shifting to low range you have another problem. Remember you have to hold the brake for it to shift to low range. Find an icy spot or jack up a rear wheel, put it in gear and have a helper see if the front driveshaft is spinning.
Thread Starter
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Senior User
Joined: Dec 2011
Posts: 107
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From: Texas
The heater defaulting to defrost could be a vacuum leak at the hubs when you engage the 4 wheel drive. Have you tried manually locking the hubs? It sounds like you have a vacuum leak for sure. If the transfer case isn't shifting to low range you have another problem. Remember you have to hold the brake for it to shift to low range. Find an icy spot or jack up a rear wheel, put it in gear and have a helper see if the front driveshaft is spinning.
Senior User
Joined: Nov 2014
Posts: 143
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From: NC
You should also consider greasing your hubs as this is a commonly neglected maintenance item. Riffraff Diesel sells a fitting that works perfectly and can save you the cost of having to replace hubs.
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Is this a permanent fitting for 4wd or just 2wd?
Remove ABS fitting to use this???
Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Is this a permanent fitting for 4wd or just 2wd?
Remove ABS fitting to use this???
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Joined: Feb 2009
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Front ABS Grease-able Block Off Fitting - Riffraff Diesel Performance
Is this a permanent fitting for 4wd or just 2wd?
Remove ABS fitting to use this???
Is this a permanent fitting for 4wd or just 2wd?
Remove ABS fitting to use this???
Riffraff Diesel Front ABS Grease Fitting.pdf
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Start with checking the relevant fuses.
The vacuum leak is important in that your hubs won't engage via the ESOF controls. If you have the manual locking overides, you can always engage the hubs that way. However, that leak isn't the cause of your particular reported symptom of no activity at all.
The vacuum leak is important in that your hubs won't engage via the ESOF controls. If you have the manual locking overides, you can always engage the hubs that way. However, that leak isn't the cause of your particular reported symptom of no activity at all.