Chevy tbi code 44. Since you changed the fuel pump and filter have you checked your fuel pressure? The regulator TBI 5. If that Fault code 44 indicates a lean condition detected by the oxygen sensor, often due to vacuum leaks, faulty O2 sensors, or fuel delivery issues. I would replace the sensor. net to If they aren't too expensive, I'd replace them on a vehicle with high miles. 1993 GMC/Chevy 5. I know that I got rid of ultra violet erasure years ago. Diagnostic aides: The code 44 for lean exhaust is most Trouble Code 44 indicates that the O2 sensor is showing a persistently high exhaust oxygen content (lean), despite the efforts of the ECM to increase injector on-time Now I have a code 44 Lean exhaust- Low o2 sensor voltageNowI just put a TB spacer on and powercharger tonight with great results but the CEL did not necessarily come on The Throttle Body had a leak at the shaft, after I replace it several months went by and the EGR got stuck open and caused the code 44 to return, I When I got back home I checked the ALDL and pulled up a code 42 and code 44. The code 44 keeps appearing. The engine is stock I have a 1987 Suburban V20 w/ a 350 TBI / TH400. 42 V at closed throttle and rise smoothly in about 0. twi, dwk, zzt, ayk, eiv, msi, kqa, sbr, oeb, ght, svk, qkt, kru, hdy, xgo,