Stalling and backfiring

Tiny
J123
  • MEMBER
  • 2005 FORD EXPEDITION
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My SUV stalls all of the time it backfires every now and then. Sometimes I have to crank it 2 or 3 times before it starts. It has a very low idle and when you get to 50 MPH or more it starts to hunch. I have to let off the gas and then get back on it and one day on the highway I was stopped at a red light and when I pressed on the gas it was stuck at a low idle and would not get past 20 MPH along a 10 mile. I route I managed to get it to 40 MPH in a 65 MPH speed limit zone. I stopped turned it off and pressed the red fuel line switch in the back and it was fine for about 2 miles then it started hunching again but didn't lose power. I had to drive it 8 miles down the road before all of this to my mechanic with no catalytic converters and it ran just fine. I have unplugged the MAF sensor and the o2 sensor and that didn't fix it I couldn't even get out of my driveway.

I also had AutoZone put it on a machine and it popped up o2 sensor but it's unplugged and it doesn't explain all of the problems.
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Wednesday, April 7th, 2021 AT 6:15 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Based on your description, the first thing I would check is the fuel pressure. It could be too high or too low.

Here is a link that shows in general how it is done. You will need a fuel pressure gauge, but most parts stores will lend one to you.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you look below at the attachment, it provided the manufacturer's specifications.

Let me know what you find or if you have other questions.

Take care,

Joe

See pic below.
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Thursday, April 8th, 2021 AT 8:45 PM
Tiny
J123
  • MEMBER
Yes, thank you. I will try that but on last question if I drive it even just a couple of miles will it lead to further more expensive problems? I don't plan on driving it I'm just asking in case of emergency.
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Wednesday, April 14th, 2021 AT 9:25 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

That's a tough question to answer simply because we haven't determined the cause of the problem. However, if there is an emergency, drive it. The vehicle can always be fixed or replaced. People can't.

Let me know if there is anything additional I can do to help.

Take care,

Joe
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Wednesday, April 14th, 2021 AT 7:00 PM

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