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GMC Jimmy 4WD Problems

203 messages,  Last post on Dec 02, 2009 at 6:53 PM

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#170 of 203 fixed and broke again by jbagz Dec 21, 2008 (5:22 pm)
ok this is a continuation of my post #164, i had a bad vacuum switch replaced it and now in 2wd everything works great, although in 4wd while turning either direction a get a clicking noise sort of like a bad cv shaft noise, only i just replaced the cv about a week ago. also the 4wd does not engage in reverse, seems to work fine in drive but when i reverse i get a loud clicking/whining sound. any sugestions?
#171 of 203 99' GMC JImmy by drewcarr1 Dec 22, 2008 (12:54 pm)
I have a 99' GMC JIMMY with 150,000 mile. The milage has been crappy lately.I could drive about 5 miles and i can see a difference in the fuel guage. I had the dealership do the fuel injector service,I also had another mechanic change the o2 sensors since he said that would help the mileage.Is there any other part i can change to help my mileage. I know suv's burn more gas but i dont think i should be seeing a significant drop in my guage when i have only driven about 5 miles or so.
#172 of 203 2000 Jimmy 4wd issues by kbzook Jan 10, 2009 (4:15 pm)
Ok, I do not want to seem repetetive but here goes. My 4wd isnt working, Right now the 4wd hi is lit but it is not engaged in 4wd (only the rears spin). If I try to put it in 2hi or 4lo they blink and go back to 4hi, 4 auto will light up, but again will not lock the front diff. The shop said that the cable actuator under the battery was bad so we replaced it, the old one was still good, it held a vaccum. Looking at the actuator while the vehicle is running it has a constant vaccum (sucked in) which makes sense because the 4hi light is on. When we push the 2hi button it briefly releases then goes right back to vaccum. The relays are clicking under the dash. When the vehicle is shut off it releases the actuator. I tried taking the plastic unit that the cable goes to out of the diff but it wont come out, it pops out about 3/4" then will not come out anymore. The vaccum is good, the actuator is good, the cable is not stuck, and fuses check out ok. Could something be wrong inside the front diff? Or could it be the switch? help......please. 10" of snow expected tonight, 4wd would be mighty handy.   Kyle Replies to this message: burly2 (Feb 22, 2009 4:53 pm)
#174 of 203 2000 Jimmy 4.3 4wd Problems by kbzook Jan 14, 2009 (5:22 pm)
My 4wd isnt working, Right now the 4wd hi is lit but it is not engaged in 4wd (only the rears spin). If I try to put it in 2hi or 4lo they blink and go back to 4hi, 4 auto will light up, but again will not lock the front diff. The shop said that the cable actuator under the battery was bad so we replaced it, the old one was still good, it held a vaccum. Looking at the actuator while the vehicle is running it has a constant vaccum (sucked in) which makes sense because the 4hi light is on. When we push the 2hi button it briefly releases then goes right back to vaccum. The relays are clicking under the dash. When the vehicle is shut off it releases the actuator. I tried taking the plastic unit that the cable goes to out of the diff but it wont come out, it pops out about 3/4" then will not come out anymore. The vaccum is good, the actuator is good, the cable is not stuck, and fuses check out ok. Could something be wrong inside the front diff? Or could it be the switch? help......please.   Thanks    Kyle
#175 of 203 Not going in four wheel drive... by dion165 Jan 22, 2009 (5:42 pm)
I have been having problems with my 4x4. it would not go into four wheel. The light would blink when I put it in auto, high or low and return to two high. I replace the actuator and checked the hoses. I also replaced the switch on the actuator cable at the transfer case. This problem is recent and of course decided to happen during the winter when it is most need. The vacuum appears to be fine. Any ideas? Replies to this message: woodsman3 (Jan 23, 2009 2:45 am)
#176 of 203 Re: Not going in four wheel drive... [dion165] by woodsman3 Jan 23, 2009 (2:45 am)
Replying to: dion165 (Jan 22, 2009 5:42 pm) It sounds like the push button assembly on the dash is bad to me, good luck
#177 of 203 4 X 4 Problem by caryb1 Feb 04, 2009 (8:18 am)
In last year I have changed actuator, actuator switch, hoses from actuator to switch, switch on dash, and I resently checked transaxle fluid (fine). Everything was working fine then wham again, won't go out of 2H try auto or 4H or 4L and the light will blink and go right back into 2H. Hear clicking when pressing buttons. Sometimes no lights with light up on dash switch and other times all lights light up and now the service 4 wheel drive came on. I hear that gmc has problems with this the switch on the dash. Do you think it could be that switch again? Have rechecked actuator switch and actuator and hoses. They are fine. Is there any way to check the switch on the dash? Replies to this message: goodyguy (Feb 04, 2009 12:26 pm)
#178 of 203 Re: 4 X 4 Problem [caryb1] by goodyguy Feb 04, 2009 (12:26 pm)
Replying to: caryb1 (Feb 04, 2009 8:18 am) Try disconnecting the battery wait 5 minutes then reconnect.
#179 of 203 4 X 4 problem by caryb1 Feb 04, 2009 (4:45 pm)
Already tried disconnecting the battery for 30 mins. didn't work. One question, do you disconnect both positive and negative or just negative cable?

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