Anonymous Posted on Jun 21, 2013

Idle is rough - 2003 Ford Explorer

2 Answers

garymyers100

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Posted on Nov 24, 2014

garymyers100

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Joined: Jan 22, 2009

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Could be vacuum leak. if the rough idle comes and goes (intermittent), it could be the EGR. I just replaced the EGR on my 2001 F150 5.4L. When it got below freezing, the truck would stall as well.

"Owners of some 1997-2005 Ford Trucks with the 5.4L two-valve engine may complain of an intermittent rough idle. One likely cause, says Ford, is noncommanded EGR flow. A stuck open EGR vlave is ultimately the culprit.

To make a definitive diagnosis, connect your scan tool, start the engine and allow it to reach normal operating temperature. Next, allow the idle to stabilize, scroll down to the DPFEGR PID on the scanner's display and write down the voltage. Now disconnect the vaccuum hose to the EGR valve and connect a vaccuum pump to its port. Pump the vacuum up until the EGR valve is wide open, then bleed off the vaccuum. Record the DPFEGR voltage again. Repeat this procedure several (about 8) more times.

If the DPFEGR voltage increases by .03 volt or more from the initial reading and the idle gets rough, the EGR valve is probably stuck open. Try tapping the casting with a wrench. If the voltage decreases and the idle now gets smooth, the valve is definitely sticking. Replace it with a revised design, Part No. XL3Z-9D475-CA.

Trucks that can benefit from the upgraded EGR vlave are 1997-99 F-250 light duty pickups, 1997-2004 f-150s, 1998-99 Lincoln Navigators, 1997-2005 E-series vans, 1998-2004 F-super duty pickups and 2000-05 Excursions."

http://www.ford-trucks.com/forums/1140435-anyone-with-an-intermittent-rough-idle-please-read-this-first.html

Stevens Instrument Company 34 Gearcase Vaccuum Tester

amazon.com

Amazon com Stevens Instrument...

Anyone with an intermittent rough idle please read...

ford-trucks.com

Anyone with an intermittent rough...

Anonymous

Spark Plugs have to be changed every 3 years
Front Oxygen Sensors changed every 100,000 miles
Can't have any Vacuum Leaks -- anywhere on the vehicle
Need to have it road tested with a Professional Scan Tool
& look at all data & get caught up on Preventative Maintenance
Very few people change motor oil 3 or 4 times a year, if at all,
and the Variable Cam Actuators fail, as a result,that & few other
things can cause rough running engine & resulting idle issues
It's well known that Ford COP Ignition Coils fail sometime in
every year of ownership

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