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06, F350, Love 6.0's, rough idle and stalls out when warm
I have been following a number of threads on 6.0's idling rough after warm up and created my own hierarchy to try solving the problem. My truck is 2006, F350 with 234000 on the odometer. I did and EGR delete, new oil cooler and HPOP about 80K miles ago and the truck has run wonderfully. I was being treated for cancer last year and the truck sat for about 3 months. I started it every couple of weeks, but did not run it. After I got back to work, Norma Jean, as I like to call her started idling rough when warm. Started up fine, ran well until about 40 to 50 minutes of driving and she would shudder and eventually stalled out. I have read that people have spent thousands only to find that they still have the problem. I am self-employed bouncing back from cancer, missed 4 months of work, and not in a position where I can afford that expense. So I started my own list to repair, beginning with the least expensive part working my way to higher expense, as follows:
1. Replaced degas cap and flushed coolant from system, replaced with correct coolant.
2. Changed fuel filters on chassis and top of motor, added diesel kleen to full tank of diesel.
3. Changed oil and filter using T6 and added hot shot secret to oil.
4. Changed ICP and pigtail, I have $100 scanner from Advance Auto Parts, had bad ICP code.
5. Cleaned MAF sensor with correct cleaner
6. Removed and cleaned EBP sensor and cleaned.
7. Checked and replaced CAC boots, upper boot was damaged
Fuel pressure regulator on side of upper fuel filter bowl was changed with hpop, oil cooler and egr delete, these items were completed prior to 1-7
I completed the above work at the same time, drove for about 40 miles and everything was running great.
Batteries checked out, they are less than 2 years old and were replaced at the same time. It does not seem to be a power supply issue. When I started it up this morning, truck started fine, but ran up a small hill and she stalled out and died. I have a 2000 7.3 and I put cables on both batteries from my 7.3 and she had plenty of power to turn over, but is not getting any fuel to turn over.
FICM makes its normal sound when key is on, a consistent buzz, then ready to start, and until now, she fires up. My scan tool is giving me P0403 P0405 codes, but my EGR is deleted so I expect that. One unusual item is the mechanic that had my truck last put in a EGR valve and connected the harness thinking it would turn of the CEL in the cab. Thinking the valve may be bad, I disconnected the EGR clip, to see if the truck ran better with EGR disconnected. Then she started idling rough at startup and ran smoother after warming up, but today, she gave up all together.
I have so much time involved in solving this problem, I do not want to give it over to someone else to fix. Any advice is greatly appreciated, and am hardly a mechanic, but I can follow directions and have working opposing thumbs so I want to stick with this and see it through to the end. Suggested next steps?
Last edited by dutchbuilt; 07-24-2014 at 11:54 AM.