86-92 GM TBI Trucks without elec. trans: 1227747


The 86 throttle body injection (TBI) system was the beginning of GM’s transition from carburetors to fuel injection.  This is the first of the “classic” speed-density computers which featured a MAP sensor for airflow metering.  This fundamental airflow model was used largely unaltered in later designs.  P3 generation ECM, 160 baud ALDL communication, 24 pin chip module with 27C32 UV-Erase EPROM.

This ECM was used into the mid-90s in manual transmission equipped vehicles.  It was replaced with newer hardware when the 4l60e and 4L80e electronically-controlled transmissions were introduced.

Hardware Required for Tuning

  • G2 Chip adapter and C2 27SF512 chip required to reprogram ECM.
  • WARNING: This is NOT plug and play!  Desoldering factory chip is required and soldering install for G2 adapter.  (view install)  Order the “Install Service” and send us your ECM if you’re not comfortable with soldering work.
  • BURN2 Chip Programmer programs 27SF512 chips
  • ALDU1 with CABL1 required for datalogging
  • Ostrich2 and SocketBooster 1.0 required for real time tuning
  • APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2
  • APU1 works great for the application and is the recommended hardware in addition to the G2.

Software Required for Tuning

These computers use the $42 mask from the factory.

TunerPro RT + the $42 definitions works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the $42 definition works for editing.

WinALDL works for datalogging.