Question about 1998 Ford Expedition

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98 Expedition 5.4 4x4, engine shudders after about 2 miles, replaced plugs and fuel filter. No engine light and no stored fault codes.

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The misfire wont pend or code unless the misfire counter exceed 1400.It obviously seeking ground from the sparkplug boot,make it easy on yourself the COP (coil on plug) or the number under the heater hose that may have gotten water in there move that to the front and reinspect the sparkplug boot.

Posted on Mar 20, 2012

Testimonial: "Thanks, thinking back I had a similar problem with another car, found the plug wire grounding out, same symptoms, didn't think the boots would do that but I'll check into it. Thanks again."


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Posted on Jan 02, 2017

  • 146 Answers

SOURCE: 06' Ford Explorer engine light wont go off after repair

Yes, that sounds correct to be calibrated.and probably is what is causing your problem. Mass air flow sensors hardly ever go bad. They get dirty and set a code. Garages will try to sell you one when you can clean it with a throttle body cleaner. If you have your old one, clean it and put it back on, try it to see if it works better.

Posted on Jan 07, 2009

  • 1 Answer

SOURCE: OBD Code says ''Lean Bank 2 - System too lean

Bank 2 is generally the passanger side. Recently, We have run across a few system to lean codes in Fords. We have ended up changing the O2 sensors.

Posted on May 28, 2009

  • 1 Answer

SOURCE: 98 expedition starts then after 15-20 seconds engine dies..

Replace the idle air control valve. Mine just did it today the 15th of August. I replace the Idle air control valve and problem solve. I have a 2000 Expedition 5.4 liter.

Posted on Aug 15, 2009

SOURCE: I have a 1998 Ford Expedition 5.4l, engine has an

Your good
I would still remember, that all ford COP Coils have issues,from 1998 thru today
The Coolant Temp Sensor, should put it into closed loop, after it warms up---then the O2 Sensors can do their thing. That's one item
O2 Sensors slow to swing--maybe,need to test
Converter partially blocked-a bit of a stretch, but don't rule out.
I would buy one new coil, and walk it down from cyl to cyl,tough on that engine,but I put my money there

Posted on Oct 02, 2010

  • 14585 Answers

SOURCE: I have a 2003 Expedition

Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.

Posted on Dec 02, 2010

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2. Do a complete tune up. New plugs, new plug wires, new air filter, new fuel filter if it has not been done recently.

If the parts store pulls the codes and they cannot tell you what they mean, post them up here and I will see what I can dig up for you.

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