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Old 05-13-2018, 05:06 PM   #1
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Does this sound like a bad fca ? Just replaced the injectors a couple months ago.

It only runs like this during warm up. It's still dropping into the high 30s at night 50s during the day. It doesn't sound like the normal high idle

2006 5.9 cummins bad fca ? - YouTube
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Old 05-13-2018, 05:07 PM   #2
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It didn't sound like this a couple weeks ago.
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Old 05-15-2018, 09:27 AM   #3
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Do you have any way of watching rail pressure? In my experience, they seem to hammer really hard when the FCA goes out but mine was a failure of the valve that allowed the pump max inlet fuel. Have you tried unplugging it to see if it changes, should sound really loud and sort of hammer-like. If it doesn't change I would be inclined to think you may have a jammed FCA.
 
Old 05-15-2018, 10:26 AM   #4
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Unplug your FCA and see if it changes, that will take it to max rail pressure so don't do it for too long. If it doesn't change then the FCA is bad. I had a wire in the harness go bad and cause my rail pressure to be at max. Snedge can get you the FCA and the harness if needed.
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Old 05-15-2018, 09:35 PM   #5
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Ill unplug it and see if it makes a difference.
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Old 05-15-2018, 09:36 PM   #6
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What's the cheapest way to see rail pressure ? I've kept the cr stock and I try to spend money on the 12 valve. The mega cab is the family rig
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Old 09-09-2018, 09:32 PM   #7
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I’ve been pretty busy this summer. Finally took the wife’s truck for a spin and noticed it was running a little rougher and has a miss some days - during the 1st 15 min of run time. I wiggled the fca plug a little and could hear it rattle. Rail pressure was 7k at idle. I hope I’m hope I’m not hurting the new injectors.
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Old 09-19-2018, 07:12 AM   #8
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7k @ idle is normal.

FCA takes 5 mins to swap out. you should keep a spare FCA on hand. i do.
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