1995 Chevy Van V8 Two Wheel Drive Automatic 200000 miles
Chevy 350 TBI, gas mileage got real poor. Took it to a dealer, and they said the computer was not going into closed loop because it wasnt getting warm enough but didnt know why. Other than gas mileage, it runs perfectly. No codes or check engine light. Changed O2 sensor and coolant temp sensor. No change. It is a single wire O2 sensor, which reads 375millivolts, at startup and 30 minutes later. No change. BArely changes even as engine is revved. The coolant sensor has 2.5 volts across it when cold (and reads 2k ohms) and after 30 minutes, has 5 volts across it (reads 260 ohms). Any ideas?
have the same problem?
Thursday, May 1st, 2008 AT 1:58 AM