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Blazer Jimmy 4WD Questions

84 messages,  Last post on Feb 21, 2009 at 10:17 AM

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#25 of 84 Re: 4WD Problems [sandman7] by repairdog Feb 18, 2007 (3:27 am)
Replying to: sandman7 (Feb 17, 2007 11:09 pm) N is the only position you can go to 4 Lo in - always was. As for 4Hi the encoder motor probably has rust or crap on it and is hanging up - remove and inspect/replace as necessary. Th edash switch sends a voltage to the TCCM to tell it what to be in and if the lights out thats probably bad or connector to the TCCM dirty. Believe on yours its behind the center console/ashtray area.
#26 of 84 03 trailblazer 4wd problem by cnm50 Feb 26, 2007 (3:01 pm)
I have an 03 trailblazer. The 4 WD light will switch to 4hi &awd.The light will stay on like it should. You can hear it actuate. It will sometimes make a grinding noise and you can hear it grind into gear. once it is in gear it seems to work fine. It seems the only way to get it in 4WD is to stop, switch it into 4WD then creep forward untill you can hear the gears mesh. Replies to this message: repairdog (Feb 27, 2007 3:44 am)
#27 of 84 Re: 03 trailblazer 4wd problem [cnm50] by repairdog Feb 27, 2007 (3:44 am)
Replying to: cnm50 (Feb 26, 2007 3:01 pm) I'd look at the vac to the front axle actuator and make sure the line is good - sounds like a partial vac so the front axle coupler is slowly engaging.
#28 of 84 98 Chevy Blazer - Loose Steering by kenagirl Mar 05, 2007 (4:10 pm)
I recently replaced the baring/hub assembly on the driver's front side of my 98 Chevy Blazer. I also replaced the front tires, as they were bigger than the back tires. Truck drove great and 4WD worked like a charm through the last couple of snow storms. However, just a couple of days later, the alignment is off, the steering wheel sits crooked to make the vehicle drive straight and the steering feels very loose. Do you think this is due to 4WD use? What should I check for? Highway driving has become a bit scary. I would appreciate any advise you may have to offer. My regular mechanic has retired and closed shop and I'm at a bit of a loss now. Much appreciated as always. Kenagirl. Replies to this message: repairdog (Mar 06, 2007 1:56 am)
#29 of 84 Re: 98 Chevy Blazer - Loose Steering [kenagirl] by repairdog Mar 06, 2007 (1:56 am)
Replying to: kenagirl (Mar 05, 2007 4:10 pm) Have an alignment shop check the front end out. My guess is worn steering components such as the lower ball joints, tie rods, or idle arm and the shop can pinpoint for you - estimates are always free. This assumes the hub replaced was correctly bolted in and all items tightened and that the other hub is OK.
#30 of 84 2001 blazer grinding 2 hi by scoop2 Mar 22, 2007 (11:33 am)
I have a grinding noise in two wheel drive and when i put in 4 hi it stops i had at a shop and when they took it out for a test drive it was good after i took it home it never made a sound.I used it for a week driving around no noise,i used 4 hi and went back to 2 hi was ok and then all of a sudden it started to made a grinding noise but it seem to be coming from the right hand side,it seem to shift from 2 hito 4hi with no problem the only thing when making sharp turn 2 hi is seem to be jerky Replies to this message: repairdog (Mar 24, 2007 1:26 pm)
#31 of 84 Re: 2001 blazer grinding 2 hi [scoop2] by repairdog Mar 24, 2007 (1:26 pm)
Replying to: scoop2 (Mar 22, 2007 11:33 am) Would have to point to the front axle coupler partially engaging due to a leaking vac solenoid located on the firewall. Follow that vac line from the drivers side and you will see the solenoid. Pull that line, plug it with a golf T or something and see if that fixes the noise. If so simply unclip that solenoid and get a new one at the dealer - you need the part or # to help them about $30. If thats not it check the front diff fluid and transfer case fluid.
#32 of 84 2001 blazer by scoop2 Mar 31, 2007 (11:07 am)
i have 2001 blazer that realy hard on fuel it gets about 13to15 miles to the gallon i phoned gm and they said they can't do anything and they are a little hard on fuel so is there any reason i can't put a fuel mizer cam in it and if so what do i have to do to the computer thanks Replies to this message: repairdog (Apr 01, 2007 5:29 am)
#33 of 84 Re: 2001 blazer [scoop2] by repairdog Apr 01, 2007 (5:29 am)
Replying to: scoop2 (Mar 31, 2007 11:07 am) Wrong approach. Depending on gearing (3.42 vs 3.73) and how you drive you have a problem that is simple maintenence. My 99 4wd gets 20mpg avg with the lower 3.73 gears if I drive normally, but if cranked up to 80 over 2500rpm constant down to 18, add AC on down to 16. Slow her down to 70 and mpg go up. Other 4wds with the 3.42 I have get same but alittle better at highway as rpms lower. If you have 2wd then should be better by 1-2 mpg also.   So, tune it up - cap/rotor/plugs/wires/air filter and clean the MAF sensor in the intake (if you use a K&N oiled filter that is common problem as owners over oil and get sucked onto sensor and milegae drops). Any brakes dragging (like the rears if a recent brake job that did not replace the rear calipers). Something easy is wrong.

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