6.7 Ford injector problems

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Feb 23, 2021 | 10:13 PM

Tony Rasmussen

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6.7 Ford injector problems

2014 f350 6.7
problem: randomly after letting truck idle for little bit. 15 to 20 min. Runs very ruff , smell fuel badly, blueish smoke out tail pipe very ( very badly) with just a little acceleration. Loud clanking sound. No power while it’s happening. Seams to stop after putting truck into park turning off for min or two and restart and drive again.
What’s I’ve done so far: changed out 5 injectors due to test shows cyl 1-3-8 were not holding pressure cyl. 2-4 where neg -4 on test.
cyl. 5-6-7 were all with in range so left them alone.
Reprogramed IQA numbers in computer.
codes pulled before replacing parts
cyl 1-3-8 contribution low
codes 120 miles after replaced injectors.
Cyl 1-3 low contribution
cleared codes 50 miles later after sitting in traffic for 30 min. Code cyl 1 low contribution.

I feel the cylinders are being over fueled some how.
and why is it just random when it happens.
Truck is def deleted
SCT programming level 3 ( but does it on any level programmed)
while it’s happening floor the peddle and it sounds like fuel is just not doing anything just almost like it to much fuel and it just runs out tail pipe raw causing the blueish smoke. I swear you can feel the piston hitting the liq fuel and strain the motor down.

Feb 24, 2021 | 05:28 AM

senix

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From: Frederick, MD

check with your tuner provider is the first step.

What codes are currently present if you scan it right now?

Feb 24, 2021 | 06:09 AM

Tony Rasmussen

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Codes

Quote:

Originally Posted by senix

check with your tuner provider is the first step.

What codes are currently present if you scan it right now?

first time after replacing injectors and driving 150 miles had two codes come up. Cyl. 1 and 3 contribution
reset after notes that it cleared it self up and started running fine. 50 more miles light came back on and started running like **** again and tons of blueish smoke. Floored the gas and hammered and knocked loudly. Cleared up after turning off truck for 5 min ran good again after that. Pulled codes up again than and had only cyl 3 contribution.
drove now for 60 miles and has not done it again. But I have not let it just sit and idle like I normally do.

Feb 24, 2021 | 06:58 AM

senix

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From: Frederick, MD

A second bad injector perhaps.

I really won't let it idle for extended periods anyway unless needed and then I would do a high idle mod.

Feb 24, 2021 | 09:11 AM

Bitterroot Diesel

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Joined: Sep 2020

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From: Florence, MT

Is the CP4 filling your injectors with metal?

Feb 24, 2021 | 12:24 PM

Tony Rasmussen

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Cp4 pump

Quote:

Originally Posted by Bitterroot Diesel

Is the CP4 filling your injectors with metal?

No there is no sign of mete In or coming from pump.
Both fuel filters changed and tore old ones apart and no sign of metel there also.

Feb 25, 2021 | 07:51 AM

Mark Phillips

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Joined: May 2020

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I had contribution errors after an injector change. btw contribution errors are always at idle.

I used the below diagnostic tip for fuel knock to fix the error.. The error hasnt come back since.
oh and just skip to step 6.. steps1-5 are confusing.

https://ford.oemdtc.com/1306/fuel-kn...duty#more-1306

GL.