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Do you know what DTC'S - diagnostic trouble codes are ? Your best bet have it diagnosed by someone who has a diagnostic tool that can read these type codes . The light's on , codes are stored . 4X4 control module . Could be any number of thing's , you prepaired to by a bunch of parts till it's fixed ? Maybe !!!!!
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
The 4X4 switch is input to the transfer case control module . The transfer case control module controls the transfer case encoder motor . Then there is the front drive axle clutch solenoid an front axle switch etc .. etc... etc...
i would make sure that all the connections at the fuel tank pressure sensor are good also check for bent lines that may be restricting fuel , even the return line and vapor return line. these trucks do have a lot of wiring problems for the fuel tank pump. check the ground for the pump, it goes to frame. if you need to add another ground wire and splice it in.
If the truck was running good before the tank drop then double check everything . also you may have a bad sensor. with your scan tool you could , if the scan tool can. test sensor by add air to tank,make sure to clip the vent line and check readings when adding air to tank and then release the air and watch the readings if they do not go up and down then replace the sensor.
There is to many things that can cause that issue from engine to transmission. If there is an Auto Zone around your area, have them scan your Blazer for the DTC codes.
They scan free of charge and can give you the recommendation to what issues needs to me addressed. Keep me posted with your DTC codes, be glad to help you get your Blazer running 100% again soon.
Thank you for using fixya and be safe
This info is from the tech manual.....because you have a 16-pin DTC connector, you have the OBD II system in your car. This is cut and pasted info from the tech manual:
Fig. 2: A Tech 1® , or equivalent scan tool must be used to retrieve codes from 1996–00 models with the 16-pin DLC connector
If you look on your doorjamb and read the sticker, it will tell you the year of your car...and if it was manufactured AFTER a certain month, then you have the 96 model...and from what you are saying, you have a 96 model because it has the 16-pin connector and not the 12-pin connector that the 95 and earlier had.
The 1995 Olds 88 has an obd 2 plug, but is an obd 1 system. Some people call it obd 1.5 There is no option to jump 2 contacts to flash the codes on the check engine light in these cars. You will either need a compatible scan tool, or a cable to hook to a laptop and the software to pull the codes. (check out www.aldlcable.com) One such scan tool is the Actron CP9185. It has the extra data pin for the 8192 baud communication with the computer in these cars. (pin 9 on the OBD 2 connector)