Question about 1999 Ford Explorer

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Rough idling when cold

Engine is very rough when cold . after warming up all ok

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  • Buddy1970 Dec 13, 2008

    1999 rough idle cold 1999 ford explorer

  • MTBKER1 Feb 02, 2009

    I have a 2000 Ford Ranger. The battery gauge needle goes down (voltage decreases?) when I step on the gas. Also several times when driving at night when the gauge needle goes down the lights have dimmed-especially when I step on gas. Now it is running rough at idle-not sure if related. Had battery and alternator checked at Kragen Auto and said they were ok.

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I would check the coolant temp sensor. Hope this helps.

Posted on Dec 07, 2008

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There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

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http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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These details will help.

Thanks.

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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.

The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

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