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Derek Werner
Derek Werner, Buick Technician
Category: Buick
Satisfied Customers: 135
Experience:  ASE Master Technician, L1 Advanced level specialist
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Our 2005 Buick LeSabre starts, but will not run. Can it be

Customer Question

Our 2005 Buick LeSabre starts, but will not run. Can it be vapor locked?
Submitted: 9 months ago.
Category: Buick
Expert:  Derek Werner replied 9 months ago.

Hello and thanks for using JustAnswer!

It is not likely that your car is vapor locked. On modern vehicles the fuel pressure is much higher around 60 psi and this prevents vapor locking.

I would try unplugging the mass air flow sensor, and try to stat your car. It is somewhat common for the mass air flow sensor to fail and cause a no start.

Customer: replied 9 months ago.
Ok we will try that. It ran fine to the store, but wouldn't start after. It was 90 degree's. Do you think it could be bad gas if so what do we do for that. The tank is full.
Customer: replied 9 months ago.
Do you have another suggestion
Expert:  Derek Werner replied 9 months ago.

It is possible you got some bad gas but it is not very common. Have you filled up at the same gas station before.

Other possible causes for a no start for this vehicle is,

-no fuel pressure caused by a failing fuel pump. The fuel pressure can be checked with a fuel pressure gauge you can rent from most auto parts stores.

Also sometimes the crankshaft position sensor has been known to fail when hot. This will also cause your concern.

Customer: replied 9 months ago.
Where is the mass flow sensor is?
Expert:  Derek Werner replied 9 months ago.

A scan tool is needed to check for a bad crankshaft position sensor. A fault code will normally be set and engine RPM'S can be monitored while cranking the engine to see if the sensor is good.

Expert:  Derek Werner replied 9 months ago.

Hi i am just checking back in. Have you had any luck with your Buick?