Question about 2002 Mercury Sable
There are a number of possible problems. Try gently touching the accellerator while you crank the engine. If the TPS or throttle position sensor is bad, the pressure on the accellerator will position it to a spot where it is not worn out. If it starts better this way replace the TPS.
You should also consider a new fuel filter and a fuel pressure test. Both Autozone and Oreillys will run a scanner on your car for free. If there is a problem recorded the scan will show it. They probably will not test the fuel pressure, you will have to go to another place for that.
The engine is suppose to have a cold start routine. If it starts better when warm, that may be your problem. There are some water temperature sensors (Not for the Dash gauge) that put the idle up and enrich the fuel for a few minutes. The other possibility is fuel bleed-down or starvation. A new fuel filter may help restore pressure, but if its a bleed-down problem it may be fuelpump valving or a hole in the fuel line.
The fuelpump test should indicate a bad pump or leak as a problem. If you have a helper and a Vacuum gauge you can also check the manifold vacuum pressure while the engine is cranking. You need Vacuum to draw in the fuel to the cylinders. If you have a hole in the EGR or any open Vacuum line the fuel will not draw into the motor. Once the engine is warm, more Vacuum is created by the pistons and it may start better hot than cold.
Posted on Sep 27, 2010
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Posted on Jan 02, 2017
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