Question about 1992 Chevrolet S-10 Blazer

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4lo works fine 4hi won't engage - 1992 Chevrolet S-10 Blazer

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I have a 1992 S-10 Blazer Electric Shift. First off the 4lo is may not be working. I have personnaly thought this until I saw back tires spin.Your front wheels are not engaged. the rear wheels and transmission are acting like it is. there are 5 parts that shift the front end in an electronic shift (besides the computer) the push button (mine has 4hi , green light and 4lo, amber light), switch usually behind glove box (can hear click when U push Button) usually if that isn't workin light flashes then goes out , encoder motor solenoid (abt.$200.00) mounted on transfer case (can hear work when U push button), Vacuum actuator switch ($15.00-$20.00) screws into transfer case ( has a check ball that changes vacuum to hoses on switch), applies constant pull for vacuum actuator (usually under battery box in, it is in my 1992) Vacuum actuater ($40.00-$60.00) pulls rod (cable) that engages front end. I have had this truck for 8 years and have most of my issues with the Vacuum switch on transfer case and the vacuum actuator under battery box. The switch went bad last year and caused fluid to get in vaccuum system and it errodes the actuator. we now are engaging 4 wheel drive after taking vacuum actuator (under battery box out) by pulling cable and locking with Vice grips. this is a 2 person job. one person pulls cable out hard then the other person pulls truck forward slowly until cable lets out a little more, make sure you feel it let out then hold tight and lock vice grips on it. this makes hubs locked in and will only be in 4X4 when you push button. This is just like having manual hubs that you locked in but 4X4 shifter is not in 4hi or 4lo. i am not sure if this can cause any damage to front hubs and probably should only be used as a short term fix.I am using this now as an alternative to fixing truck (money issues) also I disengage front hubs when weather is not gonna be bad. If the vaccuum switch is bad you may have fluid in your lines and that can cause problems, you should try and blow out lines but be careful as I think this is what caused the vacuum leak in my heater controls. If fluid stays in lines long enough it can damage many vacuum lines in your truck. I hope you find this helpful, as this has been all from personal experience. Also, use your 4X4 regularly as this keeps everything workin and lubed, I personnaly engage 4X4 when going down dirt road, down rocky or dirt driveway. The encoder motor can seize up when not used enough. Have a graet day

Posted on Jan 06, 2010

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I have the same problem does anyone have a solution?

Posted on Dec 23, 2009

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Same problem here. Just replaced the vacuum actuator and it still does not work. Could not see any damage to the tubes either. However after I manually move the vacuum actuator I can get it to engage and disengage up to several times but it never lasts

Posted on Dec 17, 2009

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