2 GM TBI units, one ECM

[Ross Myers]

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>Does anyone know if these injectors fire synchronized or non synchronized??

Depends what conditions the engine is under, in C.L, the are asyncronous,
some O.L such as WOT they are fired in a pair (It is covered in my 83 T/A
W.S Manual, thankfully I haven't refered to it for a while so I can't
remember exactly).

>The application for these systems was EARLY 80's.  I dont know what ECM
they
>used

A 1226026 in my T/A (still the original unit, not a GM re-manufactured, must
be due to fail soon!!).

>or what method of IAC ( stepper/pintle like now or the old external
>that worked on the throttle linkage)

Stepper/Pintle

>Maybe someone out there has some data on the control logic of this system.
>ECM/PROM/CalPak or whatever.


It uses a BPROM, 82S181 - 1K. In fact here's a Bin from one.

Regards

Ross Myers




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