Question about 1991 Ford Taurus

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Runs rough when cold

My 91 Taurus runs rough and idles slow when it is cold out but once it warms up is fine, what could be the problem.

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  • 33 Answers

Could be a vacuum leak.

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

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  • 21 Answers

SOURCE: truck runs rough

Sounds like one of your chambers isn't firing. Run your car for a few minutes, shut it off then pull your plugs one at a time and see if one of them is wet. Might just need a new plug.

Posted on Nov 28, 2008

RALilja
  • 384 Answers

SOURCE: 1999 Ford Taurus mechanical problem

Hello,
your problem appears to be the idle control motor located on the air intake manifold it is a small motor that goes bad quite often. Other items that can cause this is a bad /clogged air filter or a tune up (spark plugs and wires), or clogged fuel injectors. to clean the injectors you can buy a container of fuel system cleaner and pour it into the gas tank and as you drive it cleans the system.

Once the fuel system is cleaned via a tankful of cleaner & gas then the idle controller motor would be next on the list to be replaced.

Good Luck !
Rich Lilja

Posted on Dec 03, 2008

chuck943
  • 783 Answers

SOURCE: 2000 Ford Explorerer rough idle When cold

what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L

Posted on Feb 11, 2009

  • 119 Answers

SOURCE: rough idle when cold

This could possibly be a faulty engine coolant temperature sensor. these sensors are prone to failing.

Posted on Nov 09, 2009

  • 1 Answer

SOURCE: 86 Ranger 4X4 2.9 fuel inj runs rough when warmed up

1988 ranger 2.9 runs great cold then after a few minutes when warmed up hesitates with intermittent black smoke from the tail pipe until i hit the the throttle then clears and will repeat this behavior...

Posted on Jun 01, 2011

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91 taurus idles slow and runs rough when cold


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My 91 cadillac runs rough just on idle


If by rough you mean it sputters like it's idling too slow, it's most likely the TPS (throttle positioning switch) which controls both the cold and warm idle.
Could also be a MAP sensor. Run the diagnostics test on the car and retrieve the error codes to point you in the right direction. Go to the link below for information on retrieving the self diagnostics on your Caddy. Best of luck.
Greg
http://www.troublecodes.net/cadillac/cadbrom.shtml

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