Question about 1992 Chevrolet Lumina

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1992 Lumina Euro 3.1 MPI, what tells the injectors to shoot gas? Not getting the proper fuel through the injectors and the proper time.

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  • simonnej_198 Aug 24, 2010

    I meant at the right time.

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The ecm (electronic control module ) operates the injectors. But their are many inputs that send information to the ecm for it to decide when and for how long to operate the injectors (it opertaes the injectors by actually providing a ground to the circut) .What makes you think its a fuel issue, do you have good fuel pressure...

Posted on Aug 24, 2010

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Gas injector spray gas all time cylinder 2 and 5 when you open ignition


92 kick. (there is no cylinder 5, sorry) it's a 4 banger. all are. that year.
must be the G16b engine. 16valve MPI engine, 1.6Liters.
open ignition?
on this car, the injectors fire about 3 to 5 milliseconds at idle.
3/1000'th of a second, only.
if they stick on, that is caused by the following
why not connect a NOID lamp to each feed wire to injector
and see what it is doing.??????
http://www.fixkick.com/INJECTORS/injectors.html#NOID
1: injector leaks.
2: fuel pressure way over 60psi and inject can hold it back.
3: ECU is stuck , bad injectors driver in ECU shorted.
in case 3 the noid lamp glows key on., steady.
4: the FSM stated injector balance test will fail.
5: the FSM stated injector leak down test fill fail.

these tests are the same for all MPI based engines.

http://www.fixkick.com/INJECTORS/injectors.html

connect noid,
key on,
the noid that glows, shows what ECU line is stuck low.
stuck low can be , bad wire or bad ECU, only.

if the noid test passes.
that is.
not stuck on
and as you crank the lamp flashes same on all 4 MPI harness connectors (injector feeds) then the electric side is good.
and the fuel side is bad.
if key on fuel pressure is near 30psi (see pump page same site)
then the injector is bad,
see link for pro $20 cleaning company.


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bad fuse.
bad conn. or wires
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alldata dot com has the drawings. (for each of 4 engines and MPI and TBI)

TBI, ? MPI], not diesel option , Gasoline.
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wiring can in fact vary by engine type.

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I would unplug the injectors first and see if the flooding stops.
You may have to test each injector to find the defective one.

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