Quote:
Originally Posted by Franke
Just thinking out loud...Dave, someone once told me in a previous post that at 4k RPM the ECM goes back to open loop for fuel mixture so the O2's, while providing feedback to the ECM, are ignored. I think I read that some where also. Have you heard of that too Scott? Anyway do the cheap stuff first. I bet Mr. Haibeck and the other tuners on here would know.
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The "learn" is off at 4k, but motor still in C/L depending on the TPS% set for
PE (power enrichment) mode.