How do you test fuel injectors, 97 legacy outback awd wagon.

15

Asked by May 12, 2014 at 06:59 PM about the 1997 Subaru Legacy 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

How do you test fuel injectors, 97 legacy outback awd wagon. car starts then quits imediatedly. we spray gas in air throttle it will stay running until no more spraying, we have checked fuel pump results were good pressure, we removed injectors and gas flows out at all locations, we used stetscope and can hear injectors pulsing, what are we missing?

1 Answer

6,535

Do a fuel system pressure test to make sure the fuel pump is not just providing flow, but also providing the required pressure for the fuel to atomize properly. The pump may be able to build up the initial pressure required to start the car but not able to sustain the pressure required to run it. This will also tell you if you have a potentially bad fuel pressure regulator or maybe a vacuume line in said regulator has come loose. If you are dead set on checking the injectors I would suggest 2 checks: 1) remove the spark plugs and turn the car over, look to make sure a mist of fuel is coming out the spark plug holes. 2) Get a noid light to hook up to the injectors or find a picoscope and use them to check the injector signals for the proper voltage signals. Your typical Volt meter is not accurate/fast enough to check this signal. I seriousley suggest looking into the fuel pressures though.

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