Notes On Intermittents

With engine running, manipulate oxygen sensor and ECM wiring and connectors while observing ECM parameter ED33. If fault is induced, parameter will jump below .37 volts and "ECON" status light will go off. Manipulate circuit No. 413 ground to engine and look for a loose ground eyelet or ground eyelet installed at wrong location. If lean engine operation is suspected, perform PFI SYSTEM CHECK  .