Question about 2003 Ford Explorer Sport Trac

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Hard to start wont stay running at idle,

Ran fine the night before,in the morning it was hard to start ,then it would only stay running by reving the motor then it ran very very roughly

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  • Ford Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

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SOURCE: rough idle; engine light appeared

I had that problem with my 2005 FX4 turned out to be a coil on #6 cylinder I replaced the coil my self and the light went out coil was $58.00.These trucks are sensitive to water in the gas you may want to add gas line antifreeze or isopropyl alcohol to your gas every other tank to displace any water which may be getting in there.

Posted on Oct 25, 2008

  • 275 Answers

SOURCE: hard to start and loping at idle

check the air filter and spark plugs and wires

Posted on Nov 12, 2008

  • 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

michigan man
  • 3533 Answers

SOURCE: 99 Expedition, runs rough, won't idle, no power.

it could be two things a bad injector or a the intake gaskets are leaking

Posted on Apr 04, 2009

  • 67 Answers

SOURCE: 1990 ford ranger 2.3L running rough at idle and while driving

Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

Posted on Apr 20, 2009

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