Idle Fluctuation - Diesel Forum - TheDieselStop.com
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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 05-31-2006, 09:40 PM   #1 (permalink)
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Idle Fluctuation

Sometimes at idle I am experiencing a 50-75rpm fluctuation. Doesn't do it a lot, but when I stop the truck and put it in park and let it idle for 10sec. and then it will fluctuate for 5sec. then smooth out. Running higher fuel pressure seems to help, and it will just randomly do it. Any ideas or is it nothing to worry about. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 06-01-2006, 08:51 PM   #2 (permalink)
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Re: Idle Fluctuation

Anyone?
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2011 6.7L-CCSB- 325/60/20 BFG A/T's- 20x10 BMF's Satin finish
Icon 4.5" Lift

2008 6.4L-CCSB- On 35's with 20x10's BMF
All bolts on's- 12.9 at 102mph

2010 6.4L-RCLB-Race Truck
Dirty Diesel, Elite Diesel, Spearco, Suncoast, Powerstroker67, Industrial Injection, PMF
Track times to come..
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Old 06-02-2006, 12:24 PM   #3 (permalink)
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Re: Idle Fluctuation

When is the last time you changed your fuel filter? Also, I would look for boost and or vacuum leaks.
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Old 06-02-2006, 01:16 PM   #4 (permalink)
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Re: Idle Fluctuation

check your fuel filter and make sure the drian plug is closed
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Old 06-02-2006, 03:30 PM   #5 (permalink)
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Re: Idle Fluctuation

Mine stumbled slightly when I first bought it like you are describing. I had a loose IC clamp on the cold air side. Cranked it down and it went away.
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Old 06-03-2006, 07:02 AM   #6 (permalink)
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Re: Idle Fluctuation

Thanks for the info. I've talked with Jody and he thinks it's programming. Says it's some times is hard to nail down the idle trying to hunt for where it should be with hybrid/singles unless you do live programming. But I will check the things you've mentioned,thanks again.
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2011 6.7L-CCSB- 325/60/20 BFG A/T's- 20x10 BMF's Satin finish
Icon 4.5" Lift

2008 6.4L-CCSB- On 35's with 20x10's BMF
All bolts on's- 12.9 at 102mph

2010 6.4L-RCLB-Race Truck
Dirty Diesel, Elite Diesel, Spearco, Suncoast, Powerstroker67, Industrial Injection, PMF
Track times to come..
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