Question about 1998 Ford Expedition

1 Answer

For Expedition 99 150K miles

Engine has little or no power when pedal is depressed at varoius speeds. When standing and pedal is depressed, engine will badly hesitate and the catch up. Difficulty going up hills. Need to stay at slow speed 3 gear or overdrive. Help

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 24 Answers

Cloged cataylatic converter. You can check this by removeing the O2 sensor before the "cats" and you WILL notice "normal operation". Granted it will be loud but it will safely get you by untill you can get to a muffler shop to replace or do what ever means necessary to "unclog" ;-) the cats, becuase on an Expedition, having 4 cats at most that might need to be replaced equals around $1500.

Posted on Feb 21, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
a 6ya Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

Brake peddle goes soft when i start my car


It is a nomral condition, in every vehicle the break paddle is hard to push before you turn the engine on. But, if you turn the engine on the paddle would go soft.

Mar 15, 2015 | Cars & Trucks

1 Answer

Revs high when i change gear


Is it possible the clutch pedal is interfering with the throttle? Start the engine in neutral and allow it to idle. Press only the clutch pedal down and see if this increase the engine speed. If it does speed up the engine and slows back down when you release the clutch then somehow this operation is where your fault lies. If it doesn't alter the idle speed, then rev your engine and release the throttle to see if it returns to idle immediately. If it is slow to return to idle then your throttle cable could be sticking. This means when you change gear lifting off the throttle has little effect and depressing the clutch to change gear causes the engine to race as the throttle is still partially open.

Aug 23, 2014 | 2005 Ford Fiesta 1.3

1 Answer

Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

May 24, 2014 | Subaru Impreza WRX STi Cars & Trucks

1 Answer

Gas pedal sticks on isuzu trooper


On the next "above freezing" day, force lubricant through the throttle cable and lube all linkage at the engine end and interior.AND BEFORE STARTING for the next while try depressing the gas pedal and make sure it is releasing fully.
If it ever gets stuck again SHUT IT OFF before you damage the engine with high RPM on a cold engine.

May 21, 2017 | 1998 Isuzu Trooper

1 Answer

1989 GMC k2500 4x4 long bed, 98500 miles on odometer. While driving truck I suddenly lost power. Depressing gas pedal only caused the engine to almost die. I was able to limp home at 5mph. The truck...


Sounds like the fuel pressure regulator in your EFI (carburator). Sorenson make a rebuild kit complete with gaskets, screens and regulator for around $30.

Aug 30, 2017 | GMC K2500 Cars & Trucks

1 Answer

I have a 2006 Ford Expedition 5.4L engine and vehicle surges or shutters in overdrive only.


It can easily be the aftermarket equipment, you can call them. Since no trouble lights are on, just ask at Autozone or another good store and see what they show for a downshift solenoid and a converter lock-up solenoid and where they are located.

Another great source, keeping in mind that an Expedition is similar to an F150, are the Blogs. I believe a site like F150Owners.com or F150OwnersBlog.com have many owners using the same performance equipment you have. Some 4x4 sites are heavy into aftermarket modifications.

Also have your engine checked for "Camshaft Phasers" which can cause "bucking" under different engine loads. There was a Recall about these parts. In short, each engine head has a Camshaft. It is a variable timing camshaft. When 1 side does not match the other, there are problems.

I hope my solution is helpful.

Mar 03, 2012 | 2006 Ford Expedition

1 Answer

Error code p1271 on trailblazer


That trouble code is faulting the accelerator pedal sensor. The APP sensors are located in a TAC module mounted to the accelerator pedal bracket. There are three individual APP sensors within the TAC module. Three separate signal circuits, low reference circuits, and 5v reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is depressed.

Nov 26, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

What is appropriate fuel pressure on 1999 Expedtion 5.4 liter engine. Expedition has run great for 9 years. Now will accelerate properly when pedal depressed. Chugs at lower speeds and, also, at hgiher...


you either have a bad sensor or fuel control problem call ford dealer they will give you correct pressure if you speak with maintenance. berrydalewolf

Oct 29, 2009 | 1999 Ford Expedition

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

185 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

fordexpert

Level 3 Expert

5610 Answers

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

Answer questions

Manuals & User Guides

Loading...