89 t2 fuel issue

[RETed]

Originally Posted by fc nut

I will check the voltage to the secondaries.

Waste of time...
All 4 fuel injectors tap off the same circuit for +12VDC.
It's highly unlikely that half of your injectors +12VDC power side suddenly stopped working.
The circuit is completed by a pull-to-ground signal coming off the ECU.


-Ted

[chibikougan]

S5 ecu will throw limp mode for the omp if its not plugged in.

[Rotary Evolution]

Originally Posted by RETed

Waste of time...
All 4 fuel injectors tap off the same circuit for +12VDC.
It's highly unlikely that half of your injectors +12VDC power side suddenly stopped working.
The circuit is completed by a pull-to-ground signal coming off the ECU.


-Ted

the ECU plug checks both the voltage to the injectors and continuity through the circuit.

and yes, the brass crimps that hold the 12v wires to the loom can and do fail.


but i'd be more concerned as to why the engine failed at 5psi and under 4500 RPMs, even if it was running extremely lean that criteria would not pop an engine. if the timing wasn't set properly, a secondary injector was not functioning and it was taken slightly higher than that then yes i could foresee it as possible. or the engine already had 1 foot in the grave and the fuel issue is a secondary problem that killed the marginal engine.

[fc nut]

I started the removal process friday and found 2 ground wires not grounded to the engine(the stock compression tube on the throttle body). I removed the upper intake to disconnect everything and the rear injector plug was barely on. With the way you had to start it, I'd say the compression was already down. It was on borrowed time.