Question about 1997 Ford Taurus

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Rough idle engine cold in gear.everything ok at operating temp.

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  • udrivek_2 Jul 26, 2009

    yes.replaced cam sensor and synchronizer by the book.replaced idle air control,egr,throttle body,intake plenum gaskets.there are no dtcs.

  • Zimme May 11, 2010

    The rough idle is only when placed in drive?

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Automatic choke out of adjustment or not working

Posted on Jul 26, 2009

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2007 1,5 Proton Arena. Cold starting very rough (stalls). Once on temp all Ok. ps yellow engine light on whole time.


You need to have the diagnostic codes read. Anything else is pure guessing. Those codes can point you in the right direction and often will tell you exactly what is wrong.

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A/c doesn't work, temp gauge doesn't work, speedometer doesn't work until it gets to 30 mph, and rough idle in the mornings. could all this be the result of a bad computer?


Very unlikely that it would be a computer problem, it does not control the A/C, or temp gauge. Sounds like multiple problems. A/C could be just low on Freon, if pressure is low, it will not turn on. Temp gauge and rough idle may be related, if temp sensor is bad, the computer wont know the engine temperature and thus not mix the fuel correctly. But there are many things that can cause rough cold engine idle, like dirty throttle plate, or bad idle air control valve. You did not say what engine you have, so this is just general information.

Mar 27, 2014 | 1999 Ford Ranger SuperCab

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Rough idle and stalling


it will have codes but the scanner in use doesn't have the right protocol for reading them
Indicates a faulty ambient air temp or BARO sensor so there will be codes

Aug 01, 2017 | 2008 Acura Rdx

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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.

Feb 21, 2011 | 1993 Jeep Wrangler

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Rough idle when warm and in gear, idle pulses slightly every now and then, check engine light is on


It sounds like the timing belt is off a tooth. Did you have it scanned to see what code was in the computer? These engines will surge when the cam timing is off.

May 31, 2009 | 1996 Honda Civic

1 Answer

Rough idle in cold temps


Maybe it needs a tune up?

Feb 27, 2009 | 1996 Audi A6

1 Answer

Rough idling when cold


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

Dec 07, 2008 | 1999 Ford Explorer

1 Answer

1991 dodge colt won't idle when engine is cold.


probably oil, it may be too thick when it's cold but once it warms up it liquefies and your engine runs smoothly. you could try changing oil, I'm guessing if you have a high performance oil the chances this is the problem may be greater since high performance things are usually geared towards working well when everything is hot

Jun 29, 2008 | 1991 Plymouth Colt

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