Question about 1995 Chevrolet K1500

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When i shift in to 4 wheel drive it gears down but front wheels dont spin and the vac line frome front axel is got a screw in it where dose that hose connect to under the hood

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The front acuator on the axle is bad the part goes from used 55.00 dollars to 179.00 brand new oem and is real easy to put on

Posted on Dec 31, 2008

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My 4 wheel drive will not engage, could it be a blown fuse?


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
sscullys_46.jpg

Dec 17, 2010 | 2005 Ford F-150

1 Answer

2004 f150, shift into 4 wheel,manual shift in floor, light comes on but dosent go into gear, any suggestions?


Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
sscullys_54.jpg

Dec 15, 2010 | 2005 Ford F-150

3 Answers

GMC '91 Jimmy, Transfer case. When in two wheel drive I hear a slight grinding noise and rattling noise. When in 4 wheel no noise. 330,000 miles, could something be worn? What keeps the transfer case gear...


Remove the transfer case and strip it down,wash it out and replace whatever is worn.
330,000 miles is unrealistic
Your chain is worn and stretched for sure, and rattling and may be cutting into the case.
Don't install another salvage yard unit, unless you can not repair yours. Then strip down whatever you purchase, and go thru it also.

Sep 17, 2010 | 1991 GMC S-15 Jimmy

2 Answers

4 wheel drive not engaging


The neutral/foot on brake or park is only if you are shifting into 4L. If you are shifting into 4H, applying light throttle up to 55 mph shift on the fly is fine ( per owners manual ).

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
0fa4f4b.jpg
If the front drive shaft turns, I have seen some lightly hit the back of the transfer case, to free up the shift motor, with mixed results.
If you had a vacuum leak, the front wheels would be locked in, or poping in and out of locked in, causing a grinding noise ( IWE gears not engaging fully, grinding the teeth off ).

If you find a problem with the vacuum lines or the IWE solenoids, you can pull the vacuum lines and plug them, this would leave the front wheels locked in all the time. Fine for short use, don't try racing like this ( pushing a dead axle is a lot of HP requirements )

Dec 19, 2009 | 2004 Ford F150

1 Answer

4 wheel drive issue


check your vacuum lines behind the front wheels

Mar 08, 2009 | 1997 Kia Sportage

2 Answers

Front drive, 4 Wheel drive won't engage


that vacume line goes back to the transfer case, the end that goes behind the motor hooks to a steel tube so it does not get hot from the exhaust., my guess it should be hooked up so it will feed vacume to the vacume ball so it can lock in the axels. if you start the car and shift into 4 wheel drive and listen under hood you should hear a hissing sound, that is vacume, if you can't hear it there, you may have to craw under the right side to hear it, probably came unhooked underneith the car

Feb 01, 2009 | 1995 GMC Jimmy

2 Answers

Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
if no vac switch bad or 4wd shift likage needs adjusting
if yes vac motor bad or stuck or shift fork stuck
remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

Jan 27, 2009 | 1999 Dodge Ram

3 Answers

1996 Toyota 4runner 4 Wheel Drive Problem


Auto hubs locked up? Electrical relay faulty? May need servicing.
ToyotaED would be the EXPERT to ask on this one.

http://www.fixya.com/postBuddyProblem.aspx?budid=1150094

Jan 10, 2009 | 1996 Toyota 4Runner

2 Answers

4 wheel drive not working


my mechanic took it apart and found metal shavings in the lube

Dec 26, 2008 | 2004 Chevrolet TrailBlazer

1 Answer

No four wheel drive


Hi, I had a 88 cherokee, had no 4 wheel drive, the vac. motor u r referring to engages the 4x4. Mine vac motor was replaced, fixed the problem.

Nov 09, 2008 | 1989 Jeep Cherokee

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