The ECM is not responding to changes in the AFR table at full throttle. What is the problem?
At throttle openings greater than roughly 80% and RPMs greater than the Power Enrichment (PE) RPM setting, the ECM enters PE mode and uses the “PE Air-Fuel Ratio” table (Figure 3‑19) to control the AFR. This can cause problems when calibrating the VE tables during WOT. During this procedure, the AFR will track the PE AFR values and the main AFR table will be ignored.
