Hello, I have a 2003 F350 6.0 automatic. It sat all winter long but started right up in the spring no problem. I used it to pull my 20' 7000lb trailer about 50 miles with no trouble (it was a little low on power at low revs) Then after the weekend I went to pull the trailer home and it acted funny. First thing was that it lost significant power, almost like no turbo power. I limped it home and plugged in Forscan. The vgt was cycling from 85 to 15 and back. So I pulled the turbo. Sure enough it was pretty stuck inside. I cleaned it all up and everything moved freely. I reinstalled the turbo and went for a 20 min test drive. (After it had learned the vgt). It went ok until almost back home when it developed a considerable misfire. Again I plugged in forscan and checked. Sure enough I had an out of balance on cylinder #3.
So I pulled the injector and freed up the stiction. (it was really stiff, perfect smooth now) since I had the oil rail off I thought I should pull cylinder 1 5 and 7 and check them. cylilnder 5 was sticky too but not as bad as 3 was. 1 and 5 were fine. I reinstalled all the injectors back to where they were. I then started the truck and it ran fine until it got warm. Once warm the miss was back. A scan showed cylinder 1 this time. I am 100% certain it was not mixed for cylinder 3. (it has the letter J on it and cylinder 3 had an A while 5 and 7 had B)
I am stumped now. I checked number 1 again and refired the truck. It ran great for 5 minutes then the mis was back. Once its warm the truck will not restart either as if the hpop is leaking. Reading icp it doesn't pull the psi expected when hot. The truck has a new hpop with less than 3000miles on it. also new icp and ipr at the same time.
I assume at this point that I must have damaged an o-ring on top of one of the injectors when reinstalling the oil rail. Does this make sense to you? With cylinder 1 out of balance is it likely that #1 o-ring is damaged? Anyone know the part number for those O-rings. (I think they are actually D rings)
Before you say its a leak at the fitting remember its an 03 which doesn't have the same hpop as the 04 and up.
The truck hasn't got the power to pull a sick ***** of the toilet either. I cant even road test it right now.
Someone help, please! (oh and It has fresh rotella t in it)
Just to rule out the easy stuff, did you check all the electrical? Batteries, alternator, FICM? Moving contribution issues in one bank can be a connector or power supply issue, and you said it sat all winter.
When you ICP doesn't pull psi expected, do you mean the ICPV and ICP desired PIDs are different, or it's not showing what you expect? What are ICPV, ICP, and IPR% doing while it's running rough? What all work was done 3k ago, just an HPOP or something more in-depth that could take out the IPR valve with debris?
thanks for the fast reply. at the time I changed the hpop I put in a new screen, icp and ipr. I didn't just do the hpop. I also upgraded the oil tube to the turbo since I was there.
When cold I see the icp and ipr functions as expected. They also match the expected levels as per froscan scanning. When it is stumbling the icp and ipr as expected. If I turn it off when hot and go to crank it the ipr doesn't come close to the expected level.
FICM voltage is a steady 48.5v key on engine off and while running.
the stumble or mis seems to go away in neutral over 1000rpm and the engine revs normal. But in anything other than park or neutral it wont even rev.
and none of the O-rings appeared eroded. I haven't yet pulled the oil rail again to check, waiting for it to cool down again.
Batteries and new as is the alternator. I had an issue last fall with overcharging so I bought new batteries and replaced the alternator.
I should maybe add it had a surging issue last year before it was parked for the winter. It also would give a strange pffft pffft pfft noise under load. (like pulling a trailer up a hill but lacked no power).
Last edited by BigStyle; 05-15-2014 at 03:11 PM.
Reason: missed info
I needed to move the truck so I started it up with the scanner plugged in. The truck now has P0163 and P0169 imbalance cylinder 1 and cylinder 3. ARGH! I think to start I will remove the oil rail and replace all the orings on the rail and the O-rings from the rail to the injectors. Any other suggestions to add? Anyone? It really runs awful.
I have pulled 1 and 3 again, to inspect the orings. Everything looks good and they pass the buzz test. I will torque them in tomorrow and double check my ficm voltage running when the miss is there and post the results. I'm not a diesel mechanic by any means but I know my way around a motor and build motorcycle race motors. I am going to swap 1 and 5 around and see if my problem follows suit with the injector. I guess its the best way to test for bad injector.
I can understand that but would I not see some blowby up the injector? Also I have removed the #5 and #7 injectors with no code or further problem.
I have O-ring kits on order with new washers and will replace them but I would think it would be able to trouble shoot without.
Also I have done key on engine off injector test and all pass. If that helps with troubleshooting. When I install them tomorrow I will check FICM voltage running. I think when I was last looking at the ficm voltage it wasn't running rough. Is it possible it goes bad when hot only? I have had crank sensors do that. (on this truck last fall and many motorcycles)
No, of course not...so changing the injector to another cylinder and seeing if it follows will help to narrow down the possibilities.
Would a ficm going bad cause the imbalance to jump around cylinders? At one point yesterday it was running great then imbalance on cylinder 8. When I next started it imbalance was on #1. Its now consistently on cylinder #1 and cylinder #3.
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