Just connect a paperclip to the top 2 ports on the far right side of the OBD scan port under the drivers side dash. Then turn the key forward 1 notch before starting. The first code should be 12 and it flashes 3 times, then simply right down what the next codes are. ALL CODES FLASH 3 TIMES.
fuel pump low voltage
That would be the OBD I Diagnostic Connector.
knock sensor
it a transmission slipping code
DTC code 81, 2-3 shift solenoid circuit fault. DTC code 12, indicates the diagnostic system is working.
Trouble code P0700 means:Transmission control system malfunction
what is the wheel base for 1985 s10 blazer
Yes
The 89 model does not have a VSS.
Trouble code P1870 means: Transaxle Component Slipping (4T60-E)
Yes it will fit.
on a 91 blazer s10 4wd