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2003 ford focus runs rough when cold

When you first start the vehicle it idols rough until warm. Once warmed up it seems to go away.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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chuck943
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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

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  • 11 Answers

SOURCE: 1984 Jaguar xj6 runs rough on cold start and fuel

Hello Drankin ;
The causes of this particular problem can be that of many . Is this car a daily driver or a garage queen ? I would attack this problem by ruling out the items with the lowest cost first . Please note that the info below are some of the steps I would take at tackling this problem .

a) Check that your oil filler cap is on tight and that the seal is good .
b) Check the electrical connections to be certain nothing is loose .or disconnected .
c)If the car has been sitting, run it for a while and try to empty the tank of that old gas . I would refiill it with new gas and fuel injector cleaner .
d) I would change the fuel fiter with a new one .You must do this with the engine depressurized and off with both filler caps open .
e) You could also check for air leaks at the intake manifold .
f) How is your exhaust ? Is it leaking ?Is it blocked at the ends ?
g) Check the the Butterflies on the Air-Flow-meter . Make sure that they open and close easily . There are spray on cleanes for this . Do not hone the openings .
h)Relace the charcoal cannister .
i) I would do a compressionon all 6 cylinders
j)Check the fuel pump for proper pressure or replace it .
k) At the emission's station check to see what is the idle mixure and you may need to have the idle mixure adjusted on the airlow meter .
L) Check/ Rule - Out the Auxillary air valve .
m) Check/ Rule - Out the Fuel Injectors .
n) Check/ Rule -Out the Coolant temperature Sensor
o) Check/ Rule - Out the Air Temperature Sensor
p) Check/ Rule - Out the Thermotime Switch

I hope that this has been helpful to you .

Posted on May 25, 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

  • 78 Answers

SOURCE: 2003 Mazda MPV ES that idles very rough when warm

that means could be vacuum leak

Posted on Jan 10, 2010

jfh1
  • 111 Answers

SOURCE: 2000 beetle cold start rough idle until it warms

Could be the fast idle sensor check to see that the vacume line is hooked up properly.

Posted on Mar 17, 2010

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