1995 Chevy Suburban 4WD and engine is...

1995 Chevy Suburban 4WD and engine issues

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Since: Nov 08

Sterling, CO

#1 Nov 20, 2008
Hello all, my truck is a 1995 Chevy Suburban LT that has always been taken good care of. I've never had problems with the 4WD before, but recently the system has started acting up. When switching from 2H to 4H in neutral, you can hear what sounds like the linkages switching and locking the front wheels, but they never end up locking and I end up just spinning the back tires (off-road instances). Also, the front wheels on the diagram on the floor shifter don't light up anymore once it's switched into 4H or 4L. I'm not 100% sure but 4L almost seems like it's working...I've gotten unstuck by switching into 4L versus 4H several times lately on the trail. Any thoughts on this issue? Winter is fast-approaching in Colorado and I will definitely be needing 4WD soon!

The other main issue lately involves the Burb not wanting to stay running once it starts once in about every 3 or 4 starts. It'll start right up, go up to about 1,000 RPM, then promptly die. To get it up and running I've had to crank it several times and pump the accelerator many times before it finally starts up and runs smoothly from then on out. I recently cleaned my air filter and will be replacing my spark plugs and fuel filter within the next week or so. Any ideas regarding THIS issue?

(sorry for the novel!)
Jeff in CO

Houston, TX

#2 Nov 20, 2008
Couple of thoughts.

The 4WD might a faulty actuator that controls the engagement of the front wheels. Even though the rears can shift into low range, the fronts never engage. I know there are some problematic ones that act up even more in colder weather.

Here is a good write up on the actuator switch:
http://oursuv.com/oldsubforum/Forum/suvsuburb...

Engine stalling. How many miles? Perhaps your fuel pump is starting to go out. Or perhaps a throttle positioning sensor or Idle Air Control sensor. Do you have a check engine light?

Since: Nov 08

Sterling, CO

#3 Nov 20, 2008
Jeff in CO wrote:
Couple of thoughts.
The 4WD might a faulty actuator that controls the engagement of the front wheels. Even though the rears can shift into low range, the fronts never engage. I know there are some problematic ones that act up even more in colder weather.
Here is a good write up on the actuator switch:
http://oursuv.com/oldsubforum/Forum/suvsuburb...
Engine stalling. How many miles? Perhaps your fuel pump is starting to go out. Or perhaps a throttle positioning sensor or Idle Air Control sensor. Do you have a check engine light?
Thanks for the quick response Jeff. That actuator sounds promising, I'll check into replacing it soon.

Almost 200,000 on the truck, but I know it was well cared for by the two previous owners (I just bought it last fall), but I'm not sure if they had replaced the fuel pump. I was afraid that could be a possibility, but was going to start cheap with the fuel filter and sensor replacements first and see what happens.
Jeff in CO

Houston, TX

#4 Nov 20, 2008
200,000 is a lot so I'm sure it's been taken care of if it made it this far!

I'd start throwing some cheap parts at it just for the tune up sake. I've had 2 fuel pumps go out on me....the 91' around 120k and the 04' around 25k. Perhaps Chevy is putting in cheaper pumps based on my experience!

Anyways, good luck. I like the 95 because that was the first year of the nicer dash and I think driver's air bag as well.

fyi, I'm in COS.....not TX.

Since: Nov 08

Sterling, CO

#5 Nov 20, 2008
Starting cheap is definitely my plan, we'll see what happens! Yeah my parents had a '94 years ago, and the '95 sure is a nice step up from that...plus it's the LT which you can't go wrong with, given all the fun little extras they threw in (especially the retractable engine "flashlight")

Good to know, I wasn't sure what to think on where you were from!
Jeff in CO

Houston, TX

#6 Nov 21, 2008
I loved that flashlight deal in my 91'.....I don't have it in the 04' though.

I work for a TX based company so I'm sure it routes everything down to TX and then out to the web. Good luck!

Since: Nov 08

Sterling, CO

#7 Dec 1, 2008
Ah, it all makes sense. lol

Ok, replaced plugs, air filter, and fuel filter and still no change. Several parts stores have also recommended replacing the throttle position sensor and idle air control sensor, so I will probably change those out next. I know where the throttle position sensor is, but do you happen to know the location of the idle air control sensor? I've also started looking at fuel pumps from several websites and am finding them for $50-$100 which sounds very reasonable to me. I think I'll try to pick one up soon as well, and hopefully be able to drop my tank and install it myself. Any recommendations on brands of fuel pumps? Looks like there's several main ones out there, namely Airtex, Carter, Delphi, and Retech.

Hoping to pick up a new thermal actuator soon too and hopefully get my 4WD back!
Jeff in CO

Colorado Springs, CO

#8 Dec 3, 2008
The Idle Air Control Sensor is also located on the TBI unit. I did read you could try cleaning it to see if it helps but I don't remember if you use carb cleaner or not. Do a google search.

If possible get a GM type fuel pump. I takes some labor to get the tank down so you don't really want to do it again if you don't have to. Delphi may supply some GM parts but I'm not for sure.

Changing the fuel pump gave me a great excuse to get a floor Jack. Found one at Sam's that worked great (Michelin or something). It's better to change it now than to have it go out on a road trip or the middle of nowhere! My first one died at the gas station near home. Hit the tank a few times and it worked enough to get home. The 04' died the day before a trip up to Billings. Had the dealer put it in...warranty for life if they do the work.

Good luck.
Armand

Bristol, RI

#9 Jan 11, 2011
Hi Jeff.
I have the same vehicle and I never had a problem with my 4wd and all of a sudden my son was using the truck and now it won't go into 4wd and keeps blowing the fuse marked 4WD? Any ideas?

Thanks much
Eddie

United States

#10 May 14, 2011
I have a 1995 chevy 4wd. When I put in 4wd, nothing happens. the small drive shaft moves, but the gearbox does not engage. What could be the problem
Charlie

Friendswood, TX

#11 Jun 13, 2011
1 There is a acuator in the front diff. that enguages the 4x4--it heats up and gets stuck---The idle issue is the idle air control motor on the throttle body (it sticks) clean the cavity of carb on build up and replace the idle air control unit along with the long round acuator on the front diff for the 4x4!
Armand

United States

#12 Jun 14, 2011
Charlie wrote:
1 There is a acuator in the front diff. that enguages the 4x4--it heats up and gets stuck---The idle issue is the idle air control motor on the throttle body (it sticks) clean the cavity of carb on build up and replace the idle air control unit along with the long round acuator on the front diff for the 4x4!
Thanks Charlie
Jamal

Milwaukee, WI

#13 Jan 14, 2012
Hi I have a 95 chevy surburban and I put my truck in neutral & put the 4x4 shaft in 4L & 4H now when I set the parking brake on the 4x4 to go back to my regular riving settings my truck wont drive... It only drives in 4wd! Is my transmisson shot now??
bud

Wagener, SC

#14 Feb 6, 2013
have a 1995 suburban changed the front brake pads now it won't come out of park
Dorothy

Orlando, FL

#15 May 6, 2013
My 95' suburban only works in 4L and moves in reverse. Can I disable the 4WD to be able to drive my truck again? Been sitting for three months now.
Griff

United States

#16 Dec 22, 2013
i have 1995 suburan n when i cut off my truck my tail lights stay on how to fix it in
Patrick

United States

#17 Jul 24, 2014
I have a 1995 Chevrolet suburban that quit on me one day at an intersection and has not started since I have replaced the fuel pump fuel sending unit fuel lines fuel filter throttle position sensor fuel pump relay o2 sensor and still no go now looking at fuel injectors and a new throttle body I don't know what else to do my mechanic has run diagnostic after diagnostic on it no problems detected he's stumped I'm stumped it's my primary work vehicle same thing with my sisters blazer any ideas and suggestions?
steve k

Concord, NC

#18 Sep 12, 2014
I have a 95 suburban and I hear what sounds like a bearing roaring in the front gear box or where shaft goes into it.. it is better when its cold and starts at about 20-25mph. it usually only does it when accelerating or decelerating (pressure on the system). doesn't make noise when coasting... I have yet to check the fluid, but in my experience bearings only get worse, so any suggestions?? also is it possible to remove the front drive shaft and run vehicle and will this solve the problem? any input would be appreciated
steve k

Concord, NC

#19 Sep 12, 2014
Patrick wrote:
I have a 1995 Chevrolet suburban that quit on me one day at an intersection and has not started since I have replaced the fuel pump fuel sending unit fuel lines fuel filter throttle position sensor fuel pump relay o2 sensor and still no go now looking at fuel injectors and a new throttle body I don't know what else to do my mechanic has run diagnostic after diagnostic on it no problems detected he's stumped I'm stumped it's my primary work vehicle same thing with my sisters blazer any ideas and suggestions?
has to be injectors my friend or blockage right under them.. have u removed fuel line and made sure pump is sending from tank?
Perry

Victorville, CA

#20 Sep 22, 2014
my 1995 Chevy suburban went from snatching hard into gear to not being able to use any gears while in 2wheel drive. I can only drive in 4h.
my question is how long and how fast can I drive in this gear?

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