Question about 1998 Ford Expedition

1 Answer

Starts,idles, and revs fine, but hardly goes on the road, like a huge power loss! new plugs, wires, coils, and fuel pump.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 550 Answers

May be related to a plugged catalytic converter in the exhaust system. You'll need to take it to a muffler shop to get fixed. You do NOT need a 'factory/original manufacture catalytic converter'. A universal one (much cheaper is fine).

Posted on Nov 06, 2012


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1050 Answers


Probably has a plugged catalytic converter from the misfire that was on cylinder #2, which was indicated by the code. If you wanted to confirm the plugged cat, you could remove the precat O2 sensor and drive it. It will be noisy, but if you get an increase in power, you know you have a restriction

Posted on Apr 12, 2009

  • 722 Answers

SOURCE: fuel pump relay losses power to yellow wire

If you wired it yourself, note: yellow is a source wire in most wiring systems - red - direct power (battery/fuse box) - yellow, relay switch to part/component (i.e. fuel pump{electric}); then ground.
Ground, if self-wired, can be grounded to the frame,body, any metal.

If the wiring is not the issue, replace the fuel pump relay, if haven't already. If this is not the problem, or has been replaced already, you may need to replace the fuel pump. NOTE: If this is the Ford e F250,350 etc. it may have a secondary fuel pump which would be located on the driver side mounted to the frame just behind the engine. I owned a 90 F250, 2WD, and no such part was installed. At least not there.

I had a similar issue with my truck, would start, sometimes run for a while and die, would drive, then randomly die while driving -

Check the fusable link next to the battery and ensure it is securely locked together - it is a twist and pull mechanism (plastic). This was the issue with mine. I tore the front of my engine apart thinking it was a timing issue, just to find out 4-5 times of doing that, that it was the fusable link - i too, replaced the fuel pump relay, fuse etc. -- check this first as it may be the cause (if carburated, also check all your plugs, wires, cap and rotor - if not carburated, have the coil packs tested - NOTE: the modular (coil packs sit/bolt to this) cannot be tested - look for bubbles, or sign of "boiled" sections. If such marking exist, it needs replaced. Have the coil packs tested anyway just to be sure. If they all test positive, your good to go - if not, replace as need - (also be suire to mark each one in the order they come off ) this doesn't really make any difference when you put it back together, however, this will let you know, in the event the modular is good, (no boils or bubbles etc) ; you will be able to determine which side (if three, left,middle,right) was the bad coil pack. Mark each, from left to right, as 1,2,3, or A,B,C - or however you deem suitable. This will be useful for reference in possible future occurrances.

I hope this information is helpful and you get your vehicle running smoothly. I understand your frustration with this particular issue, as it took me 2-3 months before I realized that the fusable link was the issue - had spent 3-4 hundred dollars in parts ---

Please let me know if I can be of any further assistance. Thank you,


Posted on May 13, 2009

  • 14036 Answers

SOURCE: loss of power on acceleration. engine bucking.

check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.

Posted on Jun 26, 2009

  • 64 Answers

SOURCE: 1989 ford f150 loss of power

1989 is fuel injected, on the intake there is idle air control valve, make sure this is not dirty, also you may want to check the coolant temperature sensor, if the engine thinks it is warmer then waht it is the fuel air ratio will be off and your truck will run bad.

Posted on Jul 22, 2009

  • 52 Answers

SOURCE: 2001 focus. Replaced plugs, wires and coil pack.

Have you replaced the timing belt? if not i would highly recommend doing so. these cars need to have the timing belt replaced before it breaks otherwise it can and will cause major engine damage.

Posted on Aug 11, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I am driving along at 60 mph for 15 min and all of a sudden it stars to spit and sputter like its out of fuel. Pull off the road and wait about a min and it seems fine except when I go up a hill it will...

Could be the plug wires or the igntion coil overheating and shorting. The tempatures rise very high when the engine is worked hard causeing the insulation on older wires to leak current and short-out, idleing lets either to cool enough to recover. Same is true for the coil.

Apr 21, 2011 | Jeep Cherokee Cars & Trucks

1 Answer

I have a 1996 gmc yukon 4x4 have flood problems I have put in new fuel pump has good fuel pressure changed coolant sensors changed throttle body changed computer plugs wires distributor cap and button coil...

Possibly a busted fuel pressure regulator diaphragm. The regulator is mounted to the end of the fuel rail.
With the engine idling, pull the vacuum line off the regulator port. If gas comes out of the port, replace the regulator.


Aug 06, 2017 | 1996 GMC Sierra

1 Answer

1990 chevy corsica 3.1 liter v6 engine. started ran fine went shopping and on my way home it dies out of no where, start it back up give it gas dies again. it will run in idle but sounds rough and as soon...

Coils and wires are the most likely culprits as they never get replaced hardly ever. You cant really test a coil, you can check for resistance on the plug wires but that doesnt tell you if the insulation is bad on them.

May 18, 2010 | 1990 Chevrolet Corsica

1 Answer

1980 VW rabbit, manual/fuel injection: I am

it starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure

Aug 02, 2009 | 1983 Volkswagen Rabbit Pickup

2 Answers

1994 safari van V6

ya these motors need tons of fuel pressure so if you have a pressure tester test the fuel pressure prior to the fuel filter and see if it is atleast 25 psi if not replace pump with new or rebuild all the luck to you with current project

Jun 25, 2008 | 1995 GMC Safari

Not finding what you are looking for?
1998 Ford Expedition Logo

Related Topics:

70 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76673 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers


Level 3 Expert

5537 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides