I have just finished deleting the EGR, with the River City kit, and am seeing several error codes P0403, P0405, P0603. I know there has been considerable discussion about whether or not these engines go into "safe mode" under various conditions, but I have never read a definitive answer to that question, in general, or specifically in reference to deleting the EGR. While my truck seems to operate fine at speed, it is rather sluggish at around town speeds, and off the line, and is showing the codes above. Can anyone tell me if unplugging the EGR valve, and removing it and installing a block off plate would be the cause of the EGR codes? If so, how can I get rid of the codes? Is the truck now in "safe mode"? Is a tuner my only option? If so, which one? The truck was produced in 06/03.

Thanks in advance.

 

I'd go with a SCT X3 if you decide to get a tuner. Sorry I can't help anymore, but I'm very happy with my custom tunes. When I purchased my truck 6 months ago, someone only did half of the egr delete and I'm deciding to either find (which I haven't) blockoff plate or put in a totally new egr delete kit. I still have the egr code and hope to get rid of it with a new kit or blockoff plate.

 

Thanks for the input. I'll try to track down a tuner locally. Gotta be someone in ABQ that sells them. My EGR delete experience went pretty well except for getting the up pipe connected to the turbo. I think the new section changed the geometry just enough to make it a royal pain in the *** to position the two pieces. The turbo of course is unmovable, and getting anything into that area to help move the up pipe is worth your life. In fact, I found working on this engine rather unpleasant all around. I put in injectors, and a new FI wiring harness as the same time, and every time you turn around, there isn't enough room to put a wrench on, or get your hand on the wrench after it's on. it's just packaged way to tight for maintenance and repair. But I have been thrashing on it since March of '04, so you'd think I would be used to it.

 

Have you tried plugging the EGR valve in and leaving it tied up on the top of the motor? You may get a P0401, but the limp mode may not be as severe.

 

Check out the text under this diagram for an explanation of why a DTC sets after an EGR cooler delete:



IAT2 sees too low of an air temp in the intake. The only way to get rid of the code permanently is with custom tuning.

 

Thanks for the explanation and suggestions. I'm moving toward a tuner. Is SCT the only tuner mfr that includes this function? The question I'd still like the answer to is, is there such a thing as limp or safe mode, and is my engine in it because of these codes?
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No, most of your custom tuners(devices) out there include this function. However, SCT has the longest running reliable history with the 6.0, so it's usually the first one that people mention. If you go SCT route, I would suggest the X3.

You can also go with the Spartan Phalanx (what I use now, although I have used the xCal 2, X3 and now the Spartan) or the Gryphon from PHP as well, both of those have EGR disable funtions in their tuning.

Yes there is what is affectionately known as "EPA Limp Mode" that is one some of the 6.0s. I say some, because it appears to be dependant on what strategy you have on your truck and it will go into affect when certain codes are present.

 

Thanks,

Is there any way to know what codes cause it to go into this mode?
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P0403 and P0405 were set because the valve is not plugged in. The PCM monitors the position of the valve to determine if it's mechanical function is okay. Since the valve isn't present in the system, the PCM could be using a different set of fueling and air tables that should be close to EPA compliant(limp mode).

That is why I suggested to plug in the valve and zip tie it up. Once you're rolling with the dummy valve, the PCM will look for EGR flow via IAT2, MAF, EBP etc. That is what will trigger the P0401 if you are blocked off.


I know that P0401 codes don't have as severe, if any, power reduction characteristics.

 

I just spoke with River City, and their suggestion is to reinstall the EGR, and plug it in, so I guess I'll try that. that will be in line with what William 04 is saying. Hopefully it will solve this problem and let me concentrate on the other issues. Thanks for the help.
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I have a 2004 f350 dually ,of which there have been no problems.It has the superchip tow safe program, 4 inch exhaust and the afe filter.As a preventive measure should I do the egr delete kit.I am getting some surging at times not really sure what that is.truck has 40k.Any help would be appreciated.Thanks

 

Put in a device called a thermistor in the IAT2 circuit that will mimick the expected value as if EGR gas is flowing and warming the intake.

That can be done by attaching the thermistor on a part that gets hot roughly to the point of cooled EGR gas.


http://www.marineservicesinc.biz/The...ation-1751.asp

 

Thanks for all of the suggestions. I reinstalled the EGR, and moved on to replacing the rest of the injectors(now all are new), and the main engine wiring harness. After all of that, the truck runs like it is new. Since I did it all at once, I can't tell you what made the difference, but we know what the injectors are like. I had read on this forum at one point that the wiring harnesses were suspect, so I've now replaced the main harness and the FI harness. One other thing I checked was the intake air temperature sensor. When I removed this sensor, it was a solid black gooey mass at the tip. Carb cleaner revealed an intricate frame with an electronic component,(probably a thermistor) inside. Obviously any reading this sensor was taking, was wrong due to this gooey insulative mass surrounding it. I have installed a PCV filter on this truck and deleted the EGR system, so all of the black goo I found in the intercooler, and on this sensor, should not accumulate again. I'm kicking myself for not pulling the intake all the way off, and cleaning it like I did the intercooler, because obviously there is an accumulation in it that ought to be removed. The truck even has throttle response when stone cold. I've been fighting this for years, and now it's fixed. Time to go tow something.
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