Rick's Free Auto Repair Advice

Car stalls and has rough idle

Fix stalling and rough idle Taurus Sable

P0191, P0300-p0306, P0316, P2197, stalling, hesitation, rough idle, poor performance.

This could be caused by lots of things but the key might be the P0191 Fuel rail pressure sensor condition code. Because if the fuel rail isn’t getting enough fuel pressure, the air/fuel mixture will be lean and that will cause misfires and hesitation. It would also cause the O2 sensor to read lean.

So start with the basics like a fuel pressure and fuel volume test. Or, you can start on the electrical side by doing a voltage drop on both the power and ground connections for the fuel pump. Some shops are reporting corrosion on the fuel pump ground that reduces power and fuel pressure. If you find corrosion (or voltage drop), clean the connection with a wire brush and coat the connection with dielectric grease. Then clear the codes and test fuel pressure again. Or drive until the codes return.


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