Question about 2000 Ford Taurus

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When the moter is cold it idls rough when its warmed up its fine. I was thinking it might be the EGR valve but not sure

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There are a couple of possibilities. When the motor is cold there is a "Cold Start routine" which relies on a Water temperature sending sensor to tell the brain that it needs to run this routine. Usually there are 2 temp sensors and 1 is for the dash gauge and the other is for the signal to the brain. Go to an Autoparts store and tell them what you want it for and they should be able to show you where it goes.

Another possibility is a loose gasket on the Intake manifold. With a little heat the gasket seals and the engine runs better. While the engine runs, you can spray a little Choke cleaner around the gasket seams and if the RPM changes you have found the leak. Either tighten the bolts or replace the gasket.

Posted on Nov 13, 2010

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I have a 92 yj 2.5l 5 speed. it has only after warming up a misfire/rough idle. its fine when its cold and once it warms up and idle comes down it misfires/idles really rough. may be lacking power also. i...


check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

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secondly take a small screw driver aor a tiny hammer and tap the valve while the engine is running if it smoothes out replace the valve the valve is carbon filled and needs to be changed .

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