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1997 350 Vortec pickup. not getting the right amount of fuel. will start and run, but when you try to excel. the motor dies

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Your going to have to check fuel pressure to rule it out as being the cause.. If you havea K/N filter the oil from it may be coating the Mass air flow sensor. Check for memory codes even if the check engine light is off. Also you may have a restricted fuel filter or a clogged catalytic converter. To rule out the cat remove the upstream 02 sensors to create an exhaust leak. Then test drive. Keep the harness connected and just hang the sensors for this test. If you determine the a cat is clogged its possible it reached its limits and failed or you could have a fueling issue that toasted the cat.. Also unplug the vacuum to the fuel pressure regulator. If its wet on the vacuum line the diaphram is leaking. Also when you unplug the pressure regulator the RPM should increase. if it does'nt its a sign of a weap fuel pump.

Posted on Jul 30, 2009

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