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Short answer "software". EGR on any engine, but especially a turbo diesel, is an epicly bad idea that only government bureaucrats would support. Unfortunately the factory software can be problematic, if the EGR is deleted, in two areas. First if the PCM doesn't "see", electrically speaking, the EGR valve it doesn't properly control the electronic engine cooling fan. The result is the fan isn't commanded to 100% even though the engine is hot and needs cooling. If the truck is driven empty / used lightly the owner can be unaware of the problem because there has never been a need for maximum cooling. This kind of user may only note hmm my A/C isn't as cold sitting at a light or idling for a while. There are a couple of fixes, 1st just leave the EGR valve hooked up and the system works as programmed. 2nd install a manual override to force the fan to 100% AKA blue wire mod. 3rd remove the computer controlled fan and install a mechanical fan out of the 7.3.
The second problem is that during heavy load / sustained high power operation the factory software will command EGR flow at high load/temps purely to reduce combustion temps, not to meet any emission requirements. This is not what I would have done, (I would favor a fueling reduction to control temps) but that is not what Ford programmed and as a result, if you just delete the EGR system, change nothing else, and then continue to work it hard like a truck yes you may damage it (melt the pistons). The solutions to this problem are many, the simplest being to alter the programming however the EPA has aggressively prosecuted many shops for this and as a result almost impossible to get it done today. However the next couple of options that occur to me are, in no particular order, 1st install a good monitoring solution and let off the throttle if/when it gets to hot. 2nd leave the EGR system operable and tuning mostly stock unless... 3rd perform modifications that reduce or eliminate the problem ( high flow exhaust, better intercooler, high flow intake, better turbo etc.(basically any mods that reduce EGT's) 4th install a water/methanol spray system that is activated by high EGT's. anyhow thats my .02 Good luck, Russ
My tuning must be written to command the fan without egr. I monitor fan speed on torque pro and it hums along when I work the truck. Also have ported intake, turbo back, cold air intake etc. still might do the blue wire mod at some point.
today I remove the 8 glow plugs and all come full of oil , no coolant inside cylinders so far .... I going to see if the engine turns...where the oil and coolant did go???
Glow plugs always come out oily. They go through the rocker box and the body is open to oil. When you pull em out the oil runs down to the tip. It does “look” like a problem but you’re good.
I’m not sure about the coolant. That shouldn’t be low or leak from changing glow plugs.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
