Two TBI units, one ECM

[Walter Sherwin]

Don't know a whole bunch about the '749,  just what I've gleened from
Product Service Bulletins and dealer type literature.  In same, were a
couple of references to the fact that the two 4/1 drivers in the box fired
two parallel sets of injectors, and that each injector in a pair had to have
a resistance value within .4ohms of the other in order for each to
experience 2/.5amps.  If the resistances differed by more than .4ohms, then
the "low ohm" injector would rob current from the "high ohm" injector, and
the later would probably not function properly.

I don't have a good handle on the ins & outs of all possible combinations of
other TPI boxes/hardware/currents/injectors.............I'm more of a TBI
kinda guy.  Sorry.

Walt.






>Thanks, didn't realize it was 2/.5 P+Hs.
>
>Are all the GM TPI P+Hs 2/.5, hmm are there others then the sunbird?.
>WOuld the other TPIs be 2/.5?.
>How would one tell a 2/.5 from a 4/1???
>TIA
>Grumpy