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Codes P0193 and P0305, cylinder misfire

Tiny
CHARLIEPENNER
  • MEMBER
  • 2005 FORD EXPLORER SPORT TRAC
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 249,000 MILES
I replaced the fuel pressure sensor, the engine light went out on its own. About a week later I got a p0305 code for cylinder 5 misfire, as well as the p0193 fuel rail pressure sensor code. The vehicle wont start any more. I've replaced plugs, wires and coil, still no luck. Any advice?
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Tuesday, September 7th, 2021 AT 6:08 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

As you likely already know, the P0193 is related to the fuel pressure sensor. Here is what I need you to do. Either check fuel pressure or pull a couple of spark plugs after trying to start it to see if they are wet or dry. One of these plugs should be from cylinder 5.

Here is a link that shows how to test fuel pressure:

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

I also need to know if the fuel rail or fuel tank pressure sensor was replaced. This code is specific to the fuel rail pressure sensor. I realize you indicated the code definition, but I just want to make sure that is the one that was replaced. See pic below

Let me know.

Joe

See attached pic.
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Tuesday, September 7th, 2021 AT 8:59 PM
Tiny
CHARLIEPENNER
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Hi Joe, it was the fuel rail pressure sensor that I replaced. I have also replaced the evap canister purge solenoid about 2-3 months ago.

I will check to see if the plugs are wet after trying to start and let you know the results.

Thanks for the response!
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Wednesday, September 8th, 2021 AT 8:14 AM
Tiny
JACOBANDNICKOLAS
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  • 109,755 POSTS
No problem. When you check, if they are dry, see if it starts for a couple of seconds using starting fluid. If it does, then we know it is a fuel-related issue. If it doesn't, then we have to look toward the ignition system.

Let me know.

Joe
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Wednesday, September 8th, 2021 AT 7:43 PM
Tiny
CHARLIEPENNER
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I will give starting fluid a try. I did test the fuel pressure with my reader, it's at around 3.5 PSI when the engine is off, on starting it jumped to 72.5 and after letting it crank for a bit I help the gas to the floor to shut off the injectors and the pressure hung between 55 - 65 PSI. It did at that point start to very slightly tease about starting for many seconds but never did. I checked the plugs after, including 5, they're wet.

Thanks!
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Friday, September 10th, 2021 AT 5:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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If they are wet, either we have too much fuel or a temporary loss of spark to the plugs.

As far as the pressure, 72.5 is too high. It should be between 60 and 65 with the key on the engine off or when it's running.

I attached the manufacturer's fuel pressure specifications below. (pic 1)

The second pic shows a pic of the fuel pressure regulator and describes its function and location. There will be a vacuum hose to it. Make sure that hose is attached and not cracked or damaged in any way. Then, remove it and check to see if there is fuel in the vacuum hose.

Also, I want you to check for spark to the plugs. If they are wet, they may need to be replaced.

Here is a link that shows how to test for spark. This could be an issue as well.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Let me know what you find.

Take care,

Joe

See pics below.

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Friday, September 10th, 2021 AT 8:40 PM

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