Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Chevrolet > Blazer > How-to | Technical Info
How-to | Technical Info A wealth of information at your disposal.
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 07-15-2007, 08:53 AM   #16
jackwfire
AF Newbie
 
Join Date: Jul 2007
Location: Torrington, Connecticut
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Good Morning,

Just purchased a 2001 Blazer S10, 41,500 miles. Been reviewing your forum and it looks like this site is going to be invaluable to me in the months to come.
Thanks to all for posting this information.

One question, at what mileage do ball joints start to go ?

Thank you,
Jack
jackwfire is offline   Reply With Quote
Old 07-17-2007, 04:29 PM   #17
lancescott67
AF Newbie
 
Join Date: Jul 2007
Location: bloomington, Minnesota
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

In my experience, ball joints start to fail on average at about 70,000 to 80,000 miles, but thats here in Minnesota with rough roads all winter long, and pot holes up the ying-yang all summer! The better drivers get about 120,000 or more out of them. Be sure to keep an eye on the control arm bushings as well, not sure if they have improved them over the older models, but they are a common failure as well.
lancescott67 is offline   Reply With Quote
Old 09-16-2007, 12:50 AM   #18
jb-ihm
AF Newbie
 
Join Date: Sep 2007
Location: Omaha, Nebraska
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Quick question.....My 4hi and lo actually engage, but, the light still blinks in both positions. I have confirmed that they engage and work well. The only other caviat to that is that if in Auto4wd, it will switch back to 2wd. But, again, switching to 4hi engages 4wd and it stays there. It just continues to blink. Could this be a bad switch that needs to be replaced with one from motormite? Thanks
jb-ihm is offline   Reply With Quote
Old 09-23-2007, 06:29 PM   #19
Leifmb
AF Newbie
 
Join Date: Mar 2004
Location: Miami, Florida
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Hello, I have an 04 Blazer with NP8. There is something wrong with the transfer case shifting (every Blazer I get has something wrong with that system!). I've narrowed the problem down to either the TTCM or the Encoder Motor assy. However, the Encoder Motor works it just doen't seem to shift the TC all the way into gears. As soon as I press the Auto 4WD from 2Hi the Service 4WD light comes on but the system seems to work. However SOMETIMES after changing out of 2Hi and back the drivetrain will be in Neutral or pop into Neutral (happened while driving). I suspect the encoder motor's POSITION SENSOR is the problem. Does anyone have the pinout of the position sensor so I can check it with a meter for proper operation before I drop $$ for a new Encoder Motor Assy? Does anyone know where I can buy the Encoder's Position sensor seperately from the Encoder Motor?

Thanks,
Leif
Leifmb is offline   Reply With Quote
Old 10-01-2007, 05:18 PM   #20
burnchassis3
AF Newbie
 
Join Date: Feb 2007
Location: Cincinnati, Ohio
Posts: 59
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Is my blaze throwing a code if the service 4wd light is not on?
It wont go into 4wd the light just flashes.
How much will it cost avg to hook it up to a scanner at a shop? $100.00?
Anything I can try myself ,before I go that route?
Thanks!
CS
burnchassis3 is offline   Reply With Quote
Old 10-02-2007, 07:02 PM   #21
96_blazer_5spd
AF Newbie
 
Join Date: Mar 2007
Location: prescott, Wisconsin
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

i have a 99 with the 4 button switch, my 4x4 wont engage, and the lights wont come on on a brand new switch, could all this be because my abs light is on. oh and my service 4x4 light is not on
96_blazer_5spd is offline   Reply With Quote
Old 11-25-2007, 12:44 PM   #22
offroader2000
AF Newbie
 
Join Date: Nov 2007
Location: waterloo
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Quote:
Originally Posted by laxman21
Here was my problem.



On 99up there is an additional vacuum switch on the firewall that switches the vacuum on and signals the TCCM also.
hey bud were abouts is it located what side firewall???
offroader2000 is offline   Reply With Quote
Old 11-25-2007, 12:49 PM   #23
Leifmb
AF Newbie
 
Join Date: Mar 2004
Location: Miami, Florida
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

That switch is located above the distributor on the center (engine side) firewall.
Leifmb is offline   Reply With Quote
Old 11-25-2007, 01:46 PM   #24
offroader2000
AF Newbie
 
Join Date: Nov 2007
Location: waterloo
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Quote:
Originally Posted by Leifmb
That switch is located above the distributor on the center (engine side) firewall.
call me a dope but i dont see that switch,do all 99 blazers have this mine is an electric shift tc.i followed the vac line from the actuator(under the battery tray and it leads all the way to the tranny where it does hook up to a vac switch of some kind.any thoughts?
offroader2000 is offline   Reply With Quote
Old 11-25-2007, 03:21 PM   #25
Leifmb
AF Newbie
 
Join Date: Mar 2004
Location: Miami, Florida
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

The actuator is under the battery tray and is NOT the same as the vacuum switch located on the center of the firewall above. The vacuum switch is pretty small and has one electrical plug with two wires and two vacuum lines going to it.
Leifmb is offline   Reply With Quote
Old 11-25-2007, 04:47 PM   #26
offroader2000
AF Newbie
 
Join Date: Nov 2007
Location: waterloo
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Quote:
Originally Posted by Leifmb
The actuator is under the battery tray and is NOT the same as the vacuum switch located on the center of the firewall above. The vacuum switch is pretty small and has one electrical plug with two wires and two vacuum lines going to it.
yes i understansd the difference between the actuator (under the battery)and the vaccuum switch u say is located center of the firewall near the distributor,problem is that i just dont see it.do u need to remove the distributor cap to see the vac switch?//?perhaps a pic might help.usually im pretty mechanically inclines but shit i just dont see it lol.
offroader2000 is offline   Reply With Quote
Old 02-03-2008, 01:03 PM   #27
kuhlman5
AF Newbie
 
Join Date: Mar 2004
Location: Ringwood, New Jersey
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

Quote:
Originally Posted by laxman21
Here was my problem.



On 99up there is an additional vacuum switch on the firewall that switches the vacuum on and signals the TCCM also.

Do you have any additional info on the part (i.e. part number, where available). I have the same problem want to get fixed ASAP. Any help greatly apprecaited.
kuhlman5 is offline   Reply With Quote
Old 02-03-2008, 02:19 PM   #28
Leifmb
AF Newbie
 
Join Date: Mar 2004
Location: Miami, Florida
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 4wd system operation 98up Blazers

12577412 is the part number for the Transfer Case Control Module (TCCM). I changed that and all my problems were fixed. Same part failed on two different blazers of mine- 1st a 2000 and then a 2004.
Leifmb is offline   Reply With Quote
Old 02-15-2008, 11:41 AM   #29
JoulesWinfield
AF Regular
 
JoulesWinfield's Avatar
 
Join Date: Feb 2004
Location: Summerville, South Carolina
Posts: 314
Thanks: 0
Thanked 1 Time in 1 Post
Re: 4wd system operation 98up Blazers

Only one problem with the technical description.
"Note that if 4 Hi selected no action done in the transfer case."
Not true. The front drive shaft is always connected to the front left tire. Not the x-fer case. When 4-Hi is selected the transfer case is engaged and there is a ball plunger actuated vacuum switch that sends vacuum to the diff actuator. That diff actuator (located under the battery) is what draws the collar inside the front axle to couple the differental to the front right tire.

This is a common misconecption and misrepresentation in the GM tech documents.
JoulesWinfield is offline   Reply With Quote
Old 03-01-2008, 12:18 PM   #30
s10blazerman4x4
AF Enthusiast
 
s10blazerman4x4's Avatar
 
Join Date: Jun 2004
Location: Schuylkill Haven, Pennsylvania
Posts: 1,886
Thanks: 9
Thanked 1 Time in 1 Post
Send a message via AIM to s10blazerman4x4
Re: 4wd system operation 98up Blazers

Still not seeing this vacuum switch that is on the 99s and up, Anyone have a picture? Above my distributor cap there is nothing but red paint and a fancy sticker from the General.
__________________
1991 Chevy S-10 Blazer 5.7 V8 RIP
1999 Chevy Blazer 2dr 4.3
s10blazerman4x4 is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Chevrolet > Blazer > How-to | Technical Info

Thread Tools

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



All times are GMT -5. The time now is 03:03 PM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts