Skip the auto shop - Our mechanics make house calls

Q: Stalling at 50-55 mph

asked by on

I own a super duty XLT 5 passenger van with 110,000 miles on it. Last month I did a full tune up - changed the spark plugs, fuel filter and air filter. I drove about 800 miles this month. Last week my van died while driving 50 mph on major highway. I lost power control, and it wouldn't start. When I turned the ignition it made an alarm sound - ti to ti to ti to - and where the odometer is it read “Rsc not working.” I had my van towed to a Ford specialist. The van started while the repairman checked it out. He left it on for a few hours and drove 20 miles with no problem. He said it’s a harness or wiring issue for sure, but he can’t figure out the problem until the van goes dead again. It died driving 80 more miles at 55 mph. The same alarm noise went off when I turned the ignition. The check engine and a few other warning lights came on after it died. The battery and lights worked fine. It started 10 minute later and ran like new then died after driving 2 miles. It started again 5 minute later but died after driving 3 miles. The next day it wouldn't start at all, so I had it towed it to the mechanic on Saturday. When he checked it on Monday he said the van started fine. I had him drive it for 4 days until he put 100 miles on it. Nothing went wrong. Then I put on another 350 miles last week. I don’t know what to do. Do you have any ideas or suggestions as how to solve this problem?

Hi there, thanks for writing in about your 2007 Ford Econoline E-350. I could only speculate that if you lost power and the computer did not set any codes, then you may have a problem with power to the computer system. Either the main computer power relay or connection to it is causing the issue. The fuse box on this year’s vehicles were problems that the fuses were losing contact and causing stalling due to the fuel pump relay fuse. Pull out each fuse and relay separately and look for heat marks and repair connection as needed. Some may need to have a harness made outside the box. If you would like assistance having this checked, a certified technician, such as one from YourMechanic, can come to your home or office to diagnose the stalling issue and let you know what needs repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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. Stalling at 50-55 mph

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: Limp mode 30 codes

Thanks for writing in about your 2012 Ford E-350 Econoline. Anytime you get a lot of codes for the same thing, it is common practice to document the codes and then clear them. After clearing the codes, road test to...

Q: Every time I drive the epc light goes on and it's says check engine service now and sometimes it just cuts off while driving

Hello. If your warning lights are on then the first thing I would do is retrieve the trouble codes, as they will likely reveal some insight on what the issue may be. Warning lights and stalling can be caused by...

Q: Noise above 40 mph

Try to rotate the tires to see if the noise changes on your 2004 Ford E-350 Econoline. I have had many noises caused by uneven tire wear, alignment issues, or lack of tire rotations. You already replaced all the other...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...