Ford IDS will not complete high pressure fuel system test

Clinton Owner/Technician Concord, New Hampshire Posted   Latest   Edited  
Question
Drivetrain
Tooling
2013 Ford F-150 Lariat 3.5L (T) 6-spd (6R80)—1FTFW1ETXDFC12232
P0300 - Random/Multiple Cylinder Misfire Detected
P0303 - Cylinder 3 Misfire Detected
High Pressure Fuel System Testing

This is mostly a question on tool usage, I have this ford with P0303 and P0300. I just wanted to verify the high pressure fuel system and I have an IDS with a genuine VCM2 and latest software as of today. I follow all the preset criteria for running the high pressure fuel test including setting the parking brake. It goes into the 5sec countdown and then goes to the 10 sec crank and reaches 6 sec and the engine starts and displays warning criteria not met for test, hit check to restart test. It always starts and fails test. Not sure what I am doing wrong. Supposed to disable ignition so can flow test injectors but does not appear to be doing that.

This is as much training for me using the tool as for testing purposes. Customer has already changed coils and has new plugs and still has a misfire. Suspect valve deposit issues as has never had valve cleaning. Relative compression test is as near perfect as can be.

Just updating to add did attempt test with snap on modus ultra with same failed results.

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Ronald Mechanic
Birmingham, Alabama
Ronald Default
 

I have used that test many times and if the low pressure fuel supply is bleeding off to quickly and or low pressure it will fail. Low pressure test is vmm but you can tap in fuel gauge and test pressure.

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Clinton Owner/Technician
Concord, New Hampshire
Clinton Default
 

Thanks, I will check that. Was practicing with IDS and haven't really sold diagnostic time yet so gives me thought on testing process on this one.

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

Do you have a fuel leak? Do a KOEO hot soak. See if the rail press goes up or down.

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Stephen Owner/Technician
Santa Cruz, California
Stephen Default
 

Is your cranking battery voltage staying above 10.4 volts?

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Clinton Owner/Technician
Concord, New Hampshire
Clinton Resolution
 

I came in this morning and rechecked was not loosing fuel pressure KOEO which was fine. Re-ran injector test and ran fine with both the IDS and Snap On Modis. So not sure what changed other than the test was run this time with a cool engine not up to full operating temp. Last night I had just test driven the vehicle after performing an intake service cleaning with Valvoline DI cleaner kit…

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

Gotcha. Glad you got it. This far out there but its possible because the engine was hot that at various points during the test the rail pressure was rising causing inconsistent results ?!

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Clinton Owner/Technician
Concord, New Hampshire
Clinton Default
 

I was wondering that myself, as I did monitor fuel rail pressure after engine warmed up and could see it continue to rise from heat soaking for quite some time after shutdown hot.

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