Surging, loss of throttle response - smoking.
Surging, loss of throttle response - smoking.
Up until recently i've had mine shut off but not blocked for a couple of years and have had none of those issues.
If i were to guess i would say those symptoms are from the ECM switching back and forth between EGR ON and OFF tables in the DSP folders.
I see these symptoms routinely on trucks with single tunes and trucks with DSP5 tunes. I get about 5 calls a week from customers who attempt to shut the EGR off in the code and get the symptoms I describe (smoking, surging, dead pedal). I tell them to put blocker plates in or put the EGR operation back to stock. This fixes the problem every time.
I've tried disabling the EGR in the software a number of different ways without success. If you want to share your EGR off parameters I'll try them on a few trucks and see if I get consistent performance.
Nick
This is how i've always done it.
Your script sets all EGR function to stock. :)
HAHA, whoops. got the scripting backwards.
Here is mine, I also zero al 3 flow tables
I don't think a big time pro tuner like yourself needs any help from me, but I have NEVER had any kind of those problems from disabling the EGR without a blocker plate. I have recently put a stock motor back in my truck that is running without a blocker plate and the EGR shut off. I've also had a disabled EGR tune in my dad's LMM for about 60k miles with none of those issues. I've also tuned a few trucks locally with the EGR shut off and no blocker plate. No problems here.
I can't say that I did neither, but that was a while ago. I don't think I changed much other then the speedo and EGR until after I had the plate and transgo though.
Also, I do seem to recall that messing with the EGR flow tables led to the issues you report. EGR is best disabled without touching them. I don't know why, however.
These ECM's are like drug interactions sometimes.