Question-Hi I've already changed the fuel pump ,the pressure regulator and the filter. Its getting proper pressure and plenty of fuel. What else could it be?
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Followup To
Question -
we're trying to repair one and we can get it started but then it just sputters and dies. it doesn't seem to be getting fuel after it starts.what do we do?
Answer -
Hello Amber,
Sounds like it is running out of fuel. Fuel filter or pump would be where to start, but test pressure to be sure.
Van
AnswerHello Amber,
I assume it is throttle body injection, therefore looking down into the throat of the throttle body, you can see the cones of fuel die under the injectors.
If the pressure is maintaining at 13PSI all during that time, then injector pulse would just about have to be the problem.
The ECM controls the injector pulse, but it depends on several signals from sensors after warmup to adjust the mixture.
However, before the engine warms to operating temperature, default values are used, thus eliminating things like oxygen sensor, throttle position sensor, and mass airflow sensor. When cold, it should run with them unhooked.
Now, there is a coolant sensor that could be telling the ECM that the car is warm when it isn't.
The ECM itself could be bad.
Wire harness connections could be loose.
The EGR valve could be opening, which would be at the wrong time, and a different problem to look for, but worth a check, possibly even disconnect it to see.
A large vacuum leak, like that EGR valve, or the brake booster, or a gasket.
Possibly the crank sensor, although I am not sure how that fits into the above discussion about other sensors, but it is needed to keep the fuel pump running, but you know it is running already. However, there is an oil pressure switch that can keep the pump running, even if the crank sensor is gone, as long as there is oil pressure.
Van
