Q: My '98 expedition drives fine for a while, then after a few hours, when sitting still, it idles rough then shuts off.

asked by on

I drive a 98 Ford expedition. It drives fine for a couple hours. After that, it idles rough at stops, then shuts off. I start it back up, I give it gas it shuts off without catching gas. I restart it, without giving it gas, it idles, but still idles rough then shuts off again. I have to literally wait about an hour. Start it up, then it drives fine

My car has 300000 miles.
My car has an automatic transmission.

After some testing done to verify the EGR valve flow to see if the valve is intermittently sticking open causing the stall. This can be done using a scanner with the capability to open and close the EGR valve and monitor the DPFE sensor at the same time. There is a technical service bulletin 05-4-17 to replace the EGR valve if the valve sticks open. The computer system should be retested to verify the proper operation of the EGR valve and DPFE sensor. Once the EGR valve is replaced and system is verified the EGR system is working correctly without the EGR sticking open anymore then have a certified technician, like one from YourMechanic, scan the computer to clear any codes. Once codes are cleared a road test should be done on the car to verify the repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My '98 expedition drives fine for a while, then after a few hours, when sitting still, it idles rough then shuts off.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I think the anti-lock security on my car is active and it doesn't start.

Hi there. Look at the anti-theft system on the vehicle and see if the light is flashing. If the light is flashing, then remove the battery cables and leave them off for 13 minutes. While the cables are off, put...

Q: Car starts then sputters and dies. Last longer if I give it gas, slowly dies after.

Hello, thank you for writing in. The issue will need some further testing before we will know definitively. To begin, considering the symptoms, start by measuring your fuel pressure. If the pressure is weak, you want to replace the fuel...

Q: Isn't the timing belt suppose to be changed at 90,000?

I would definitely recommend changing the timing belt at the 90,000 mile recommended interval. As you may know, the timing belt keeps your engine's critical components in sync. Fortunately, this model does NOT have what is called an "interference" engine...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.