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EGR Synergy with A/C; no code 71?
I've been plagued with a code 71 for several years now, which indicates
some problem with the EGR. It's sporadic; it takes a few days to show
up which makes it difficult to solve. I tested the modulator and valve
according to the manual and they both check out OK.
However, recently I found that if I have the A/C on, it won't light the EGR
code. One time, I turned off the A/C code and almost immediately it coded.
Does this help solve the problem? I mean, somehow the A/C is doing
something that prevents the computer from throwing the code 71. Does
it only throw the code if "Idle Up" is off? Seems like this might be enough
to finally isolate it.
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Linear Mode
