Question about 1998 Ford Explorer

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98 explorer 4.0 SOHC wont idle and stalls when weather is below 40 degrees. worse when colder. Just had tune up, new airfilter new fuel filter but problem did not get better.

It will start if you keep the RPMs at 1500-2000, once it warms up (5 mins to 25 mins) it seems to idle and run pretty good.

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  • Ford Master
  • 2,101 Answers

You have a bad idle air control valve. its job is to have motor rpm high until the motor warms up then turn it back to normal.

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

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SOURCE: 98 Ford Explorer erratic cold idle

98 ford explorer erratic idle from cold reves jump. ok when warm but still stalls at times.

Posted on Feb 06, 2010

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

csmock132
  • 4669 Answers

SOURCE: Truck dies

Replace the Idle speed control valve.

Posted on Mar 13, 2009

  • 14036 Answers

SOURCE: 98 ford escortLX starts and runs for about 1 min and then stalls

check fuel pressure regulator.+ vacuum lines going to it look see if gas in vacuum line.if so regulator rupture.

Posted on May 03, 2009

james klgr
  • 362 Answers

SOURCE: New plugs, new fuel filter,

you have a vacume leak explains all symptoms runs leaner better gas milage listen for hiss look for cracked or broken vac lines

Posted on Jun 21, 2009

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