Gustavo

I have one stumping me. I have a 2004 early build 6.0 that misfires on cylinders 5,6,8 only at idle when warm in drive. Trucks has good acceleration and drives great. DTC P0278 sets. Noticed when coming to a stop the whole bank cylinders 2,4,6,8 drop and as soon as I stop at idle in drive 5,6, and 8 begin to drop -10 rpm . Relative compression test passes, manual compression all cylinders are about 380psi. Ficm m power remains at 48 volts. Fuel pressure is at 67 psi. I replaced the fuel check valves and fuel filter standpipe ( fuel filter standpipe was broken). No fuel aeration.  When I disconnect the icp sensor the engine smooths out the power balance is straight. I replaced the icp sensor and connector., concern was still there. Fuel filters where changed and lof was performed.. I replaced all 8 fuel injectors  with the early style correct fuel injectors. But the misfires remained at 5,6,8. I air pressure tested the high pressure oil system with the engine hot and hear no air leaks. I switched the high pressure oil rails to the opposite sides and retested. Replaced the driver side high pressure hose, both high pressure oil standpipes, and both check valves on the high pressure oil rails. Installed a known good ipr and concern still present. Power balance remained at 5,6, and 8. Noticed when pressing on the brake pedal hard the concern goes away. Removed serpentine belt and concern went away. Inspected pulleys but all pulleys were good. Fan does not stay engaged. Noticed it does this based on IPR load. Decided to get the engine hot and removed the driver side valve cover. Ran the engine with driver side valve cover off and noticed excessive oil was misting from the top of all 4 injectors on the driver side at about 800 rpm and above. Don’t know if this is normal but any help would be greatly appreciated. I have contacted hotline gave them my diagnosis but they basically told me to replace the high pressure oil pump and contact them only after I replaced it. I replaced it doubting them and the concern was still present. After I told them results and the concern  remained they basically said I was on my own and to escalate it to the and service manager. I’m the only diesel tech at my dealership. And the Shop foreman has no diesel experience.

Had a turbo bearing failure with oil leaking into engine caused the engine to hydrolock. Bent connecting rod #8 . Piston skirt and cylinder wall got damaged. The oil level was really low.

What about the steering shaft and heater hoses? Do they have to be disconnected when doing this procedure?

Finally got to work on one, came in for overheating. Pressure tested cooling system, Saw no external coolant leaks. Could see some coolant residue on the egr cooler clamp. Pressure did drop. I didn't follow the workshop manual for the removal procedure, it was telling me to remove the intake manifold and egr  valve. Managed to get it out without removing them. Once I removed could see it was wet inside with coolant.  Pressure tested egr cooler and failed It was somewhat of a PITA. Only has 17,000 miles.

Last time I had a p0087 was because their was Small metal flakes in the high pressure fuel system. There was no visible metal flakes on the pcv or vcv. But when I took a sample from the left rail on the return line in a black cap I found the metal flakes.

I use a combination wrench ezred ez4s38l with a torx 30 bit more leverage if they're real tight,

You are correct no rusty bolts.I live in Southern California. Must be a pain working on a 6.4 with rusty bolts.

Make sure you are getting base fuel pressure and reset high pressure fuel pump parameters and bleed the low side and high pressure side system.

I always remove the hpfp with the cab on. Get it out and put back together and running in 5 hours.

Yea I saw the video a lot of good info there. Always learning new things. Thanks guys.

Onope didn't know, now I know lol

Installed a new DPF, Problem gone. Drove 35 miles problem never returned. I don't know how a code didn't pop up if it was clogged. It doesn't look like it has carbon buildup and I try to shine light through it but don't see it at the other side. This truck was a pita to diagnose. Thank you everyone for your time and info. You guys are very helpful.

Yes turbo is oem, my coworker replaced it already but concern is still present. Checked the fitting in the manifold but it is clean no carbon. put a wire throughout it anyways to make sure. And there seems to be airflow through the egr pipe as mentioned above EGRTA reading 291F and EGRTB reading 154F.When opening egr valve EGRTB would climb to 188F. 34 F difference. 

Have been using parts off a truck that we are waiting for authorization for an engine it's all torn down. But we swapped the ebp and tube together. And still no difference.

Hahaha. Yes it sweeps I let go of it and goes all the way back to its place. Have tried it multiple times does not stick. Also commanded voy actuator does not have any trouble moves as commanded.

Also have switched ebp sensor from a known good truck concern still present.

Yes have removed edge programmer. Wiggled ebp connector to see if there was voltage fluctuation. Did not see any spikes in voltage remained the same. Checked ebp circuits from PCM connector to ebp connector. vref circuit ,2 ohms and ebp circuit .2 ohms. Load tested circuits with light bulb and while wiggling harness, 12 volt dropp across light bulb no matter what. Pin fitted connector pins good grip do not feel loose. Has me stumped thinking maybe PCM is messed up due to programmer. Customer bought this vehicle from a performance shop.

Hey everyone. My coworker has been stuck working on a 6.4 for about a month now. Customer had brought truck with a P0088 about 2 months ago and did not want to do HPFP repair at that time. he brought the truck later. Truck has an edge programmer. So anyways my coworker replaced the HPFP, cleared adaptive tables. But now the truck on light throttle will lack power as if the vgt is getting stuck and eventually free's up and climbs fast to 42 psi. This happens only when holding the accelerator pedal lightly. Also when it feels like the vgt is getting stuck the engine chugs and i looked at the pids while road testing and i can see the egr valve going up and down. MGP is only 10 psi, while egr valve is fluctuating can feel lack of power, VGT is at 95% the whole time. Eventually stops and map pressure climbs VGT is at 92% when it sees 42 psi then it goes down and map pressure goes down and runs normally.  Egr valve position actual is equal to desired. EBP_A remains at 23 psi while EPB_DSD varies up and down about 31-26 psi. KOEO MAP=14.32 BARO =14.62 and EBP_A =13.92psi. FRP is within specs. equal to desired. PCV and VCV pods do not fluctuate. Base fuel pressure 6 psi. Did not see any air in fuel. Fuel filters are new and fuel is clean no water.  He has replaced the EBP sensor, but the new one was reading to high 16.02 psi with KOEO. So he put the old one back. He swapped the erg valve, map sensor, maf sensor, cleared adaptive tables but concern is still present. He replaced the high pressure turbo and the vgt actuator, concern still present. PCM is updated to latest calibration so we performed a PMI. Performed exhaust restriction test passed 33 psi. No visible or audible leaks present. Checked air flow in the up pipe catalyst. EGRTA reading 291F and EGRTB reading 154F. Relative compression test passes. power balance test passes. When opening egr valve EGRTB would climb to 188F. 34 F difference. DPF filter pid reads clean. Disconneced downpipe from doc/dpf assembly, felt improvement. Contacted hotline told him to replace DOC. Replaced DOC concern still present. Coworker is going on vacations and I will have to look at it. Im thinking I'm gong to start off looking at the ebp connector circuits. And going to smoke test the intake and exhaust systems, do not think he has smoke tested systems.. Has anyone else had a similar problem? any info would be appreciated. Thank you guys.

Were the fuel manifolds replaced? how about all the steel lines in the high pressure fuel system? Did he flush the fuel lines with clean diesel fuel? once the fuel system is contaminated everything in the high pressure fuel system needs to be replaced or else repeat failures will occur again.

Have a 2008 F350 that almost had a runaway condition on startup lol Oil level was 7 quarts filled with fuel. CAC cooler filled with oil. Have a fuel leak i need to find.