Mike McDonald wrote:
> Anyone know how to troubleshoot a 90 1.5L with dual point fuel injection?
> Will only start and run with secondary fuel injector disconnected.
> Otherwise floods out and won't run. No trouble codes unless injector is
> unplugged. Neither injector seems to leak only spray while engine is
> cranking. Tried all the tips in the Haynes book and all voltages and
> resistances seem OK for the injectors, MAP, temp sensor, air controller,
> etc. Any other ideas? Thanks
>
>

secondary may be sticking open much longer than required. can you start
the engine with secondary disconnected, then reconnect once running? if
so, does it run ok or flood again? the secondary should not [or hardly]
be injecting at idle, only on enrichment. if you can see it throwing
fuel, with the engine warm at any rate, it's sticking open.

on a related matter, is the tandem valve opening ok? check it by
disconnecting the tube on the diaphragm, opening the tandem valve
[that's the "choke"-like thing at the top of the throttle body] and
putting a wetted finger over the diaphragm inlet. the tandem valve
should stay open. if it closes, the diaphragm's shot. that's uncommon.
much more likely is that the vacuum tube from the actuator is leaking.
simple & cheap to replace about 1.5".