Question about 1991 Ford Taurus

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91 taurus idles slow and runs rough when cold

When it is cold out my 91 ford Taurus idles slow and runs real rough until it warms up then it is fine. what could be the problem

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  • 54 Answers

Spark plugs work better when theyre hot so change spark plugs,

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

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julio mariscal

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SOURCE: 2002 Taurus idles rough after warm enginer restart then does fine after reaching medium speeds

you problaby have a missfire, you need to check it out soon or it will have some damage on your catalyctic converter

Posted on Feb 21, 2012

eric r barnes

  • 580 Answers

SOURCE: 1988 Ford Taurus hard start problem

Change the coolant sensor located close to the thermostat housing. This is easy but do not over tighten it. You will have the same problem if you do. Tighten till it does not leak only.Good luck!

Posted on Nov 26, 2009

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Idling problem


Mike,
First check for small vacuum leaks by spraying aerosol carb cleaner at any area which might leak [ie vacuum hoses] Any vacuum operated device which contains a diaphragm needs to be checked using a hand vacuum pump. Sears sells a nice one.
Also check to make sure that the purge valve for the charcoal emissions canister is not leaking when the engine is cold.
If this does not help or you find no leaks, I would strongly suspect that you have dirty and/or leaking fuel injectors. Fords are notorious for fuel injector problems. Dirty fuel injectors first show up as a problem with engine stalling or rough idling when cold. Fuel tank cleaners like Chevron Techron will sometimes work. However, the BEST way is to remove all the injectors and have them sent out to a shop with proper testing/cleaning [ultrasound] equipment. Generally, shops which specialize in diesel fuel injection have this equipment. Should cost you around $25 per injector for testing/cleaning.

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1 Answer

1988 Ford Taurus hard start problem


Change the coolant sensor located close to the thermostat housing. This is easy but do not over tighten it. You will have the same problem if you do. Tighten till it does not leak only.Good luck!

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Check your coolant level. If the antifreeze is low the water pump may not be able to pump enough of the coolant through your heater core. When the car runs faster it is able to pump more of the warm antifreeze to the heater core.

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