SOURCE: 1994 GMC K1500. Ran great,
As per the problem which you mentioned in your question it says " Once it gets up to op temp, idles very rough, won't take fuel, eventually dies. Won't restart til cold."-------
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Its low fuel pressure or problem with o2 sensor.----------
As per your problem mentioned, it indicates the problem with fuel
pressure.-------- The fuel pressure is low.---------- First thing you can do is
get the fuel pressure checked, this will confirm the problem. --------- If the
pressure checked low that means problem is with faulty pump and clogged fuel
filter.----------- If the fuel pressure is checked ok, then other possibility
is faulty o2 sensor and crank sensor. The o2 sensors are
before and after catalytic converter.-------Both the sensors are to be
replaced.------ And as per you mentioned your problem, its quite possible that
faulty o2 sensor will cause this problem.------ O2 sensor is the part which
sends signal to ECM( the cars computer).It sends signal to computer about fuel /
air mixture.How and when to send fuel to engine.--------- If o2 sends stops
sending signal to cars computer then it will not send the fuel to
engine.------- In your case the o2 sensor is getting overheated and this is
stopping the o2 sensor from sending signal to ECM.But when your car shuts off
the sensor gets cool and again it starts working.------ So as per problem, get
both the o2 sensors checked and replaced.---------- Also get the crank sensor
checked.--------This will help.Thanks.Helpmech.
SOURCE: I have A 1991 GMC SIERRA, 350,no fuel no spark,
Do you have power to the injectors? One of the wires to the injector will come on for a couple seconds as soon as you turn the key to the on position.The computer controls the ground side. If you do not get power to one of them start looking for an open circuit. The same power source will also go to your ignition coil and ignition module. If you do not have power on the pink wire to the coil apply a temporary fused battery power source to it and give it a try, this will also power up the injectors.
Check it out and let me know.
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Is fuel being injected into the cylinders?
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