Odd Idle when at operating temp. - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 06-02-2007, 06:44 PM Thread Starter
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Odd Idle when at operating temp.

Ok no mods save the kitty delete and has NOT been reflashed by ford since we drove it off of the lot.

When warmed up, in gear, and waiting at a light, if you listen to the idle, the "knockyness" to it seems to rythmically change.

It sounds like the computer is advancing the ignition timing (making the engine sound like a trainwreck) for a few seconds, then backs the timing out (making the engine run much quieter), and slowly shifts back and fourth repeatedly. I dont know if the pcm is messing with the timing or not, but the noise is driving me whacky.

what the hell is going on?

'06 F250 CC Powerstroke
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post #2 of 18 Old 06-02-2007, 06:58 PM
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bad fuel ?

2003 centennial edition f250 4x4 ccsb auto w/blackwater long block w/arp's, 4" exhaust, airaid intake, ODawg's manifold, itp's reg return, sap modified solenoid, DC power 185amp alt, motorcraft 850cca, Warn Hubs, RS 55w 6k hid's, harley headlights, bpd 58v 6 phase, bpd water pump, dieselsite coolant filter, elc coolant, php gryphon, Xcal2 w/unlimited tow, new hfcm, glowshift fuel psi gauge, icon level kit, 20" kmc hoss, 305/55 terra grapplers TOTALED
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post #3 of 18 Old 06-02-2007, 07:06 PM Thread Starter
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definate no. The PSD has done it no matter where we fuel up. And the place we fill up has a high turnover rate of diesel and has always had great oil to burn... Both the 6.5LTD and ISB have no issues with this place's diesel.

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post #4 of 18 Old 06-02-2007, 07:09 PM
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i would say either your fuel filters are plugged (should be changed every 15k) or your EGR valve or turbo are carboned up...that would be the most likely causes...
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post #5 of 18 Old 06-02-2007, 07:23 PM
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mine did something similar, then i started run 20% Biodiesel. straightened out things real quick

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post #6 of 18 Old 06-03-2007, 09:14 PM Thread Starter
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if the egr is carboned up what should I do, somehow clean it? What about the turbo? Fuel filters were changed about 8k back or so.

No biodiesel here unfortunately.

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post #7 of 18 Old 06-05-2007, 03:13 PM
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Time to get out the ole timing light??? Just kiddin....
check this out
FDDTS - 6.0L EGR Valve Cleaning
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post #8 of 18 Old 08-23-2007, 06:59 AM Thread Starter
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Bringing this back...

Its got WAY WAY worse!!

New Fuel Filters
Cleaned EGR
4" turboback MBRP exhuast
Pulled battery terminals for 20 min


Now it does it so bad that you can hear the turbo spool up and down at idle. Oh and when you set the cruise control you can watch the boost fluctuated by 3 psi or so every 4 to 5 seconds.

What gives? Is my turbo going to grenade directly?

'06 F250 CC Powerstroke
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post #9 of 18 Old 08-23-2007, 07:06 AM
duct tape & zip ties

 
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Is there a cps sensor on the 6.0L I am just asking I don't know if there is or not. I would think there is, if so could that cause this problem.


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2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #10 of 18 Old 08-23-2007, 07:06 AM
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Quote:
Originally Posted by Bumpin' Yota View Post
Bringing this back...

Its got WAY WAY worse!!

New Fuel Filters
Cleaned EGR
4" turboback MBRP exhuast
Pulled battery terminals for 20 min


Now it does it so bad that you can hear the turbo spool up and down at idle. Oh and when you set the cruise control you can watch the boost fluctuated by 3 psi or so every 4 to 5 seconds.

What gives? Is my turbo going to grenade directly?
Mine does that every once in a while I'l going to clean my turbo and egr this weekend I had taken the turbo off before but didnt know how to clean it but it was caked up pretty good I'm thinking cleaning it will make it feel like a whole new truck!

Michael
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2004 CC 6.0 4x4 lariat

MODS:SCT XCAL3, Stacks!, Dfuser coolant filter, 6k HID's, High idle, CCV, Ranch Hand, homefabbed straight pipe, Zoo-dad, 2008 tailights, Isspro Boost gauge, Kenwood head unit, 2 mtx 10's and amp...

FUTURE MODS: Isspro trans EGT and volt gauges, ARP head studs, ???

Parts replaced so far: Oil cooler X2, EGR cooler, ...no more please!
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