My car is running lean i changed the 02 sensor the mass airflow and fuel filter and I fit the vacuum leak what else can be wrong

Asked by Mar 26, 2014 at 09:07 PM about the 1999 Buick Park Avenue Ultra FWD

Question type: Maintenance & Repair

2 Answers

100

Could possibly be the fuel pump itself or clogged injectors. You could rule out the fuel system itself by running a series or fuel pressure tests. Two main culprits of running lean, either 1)not enough fuel and 2) vacuum leaks allowing unmetered air into the system.

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