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LMAO. Yesterday I was trying some stuff while driving. I realized that under certain road conditions, my car prefers 70mph than 65. I think its because i can still be in lean burn mode, 70mph in 5th gear the tach was just under 3000. Its not great, but about 51mpg.
Similarly if I go 65mph the car gets like 55-59mpg, but often keeps dropping out of lean burn because i can't maintain the speed.
WELL the reason why this is significant, is because today I was on the highway and tried cruising in 4th gear at 70mph. After a mile or so the check engine light came on.
I came home and checked it, CODE 12 EGR VALVE ERROR. Aparently my ECU is working.
The funny thing is that so many people have read how crucial the "egr black box" is to a vx d15z1 swap, when in reality, it hardly ever gets activated. I have only seen this error once in over a year doing something I would never normally do as I almost always cruise in 5th gear. So the EGR system rarely gets used.
I'm about to go back outside and drive around until I can mimick the 4th gear condition that caused the CEL12 and then re-hook up the EGR with the vacuum gauge to see if the EGR system is working.
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