2006 DTS - Performance V8 running very rich / engine vibration
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2006 DTS - Performance V8 running very rich / engine vibration
2006 DTS - Performance V8 running very rich / engine vibration
Need advice.
Need advice.
- New coils, wires and plugs, 3000 miles ago.
- New Water pump,
- New alternator,
- New power steering pump.
- New purge valve (3 weeks ago) - checked and no issues
- 130,000 miles
- Engine started running rich while driving ( local 30 MPH)
- Only code is P0300
- engine coolant temperature sensor - no issues
- MAF sensor - no issues
- MAP Sensor at idle is showing 2.5volts and should only show 1 volt. The sensor was swapped out and the new one had the same issue
- above 2000 rpm the problem of running rich goes away
- O2 sensors swapped out for check - no issues
- Mechanic has checked all sensors, checked all injectors, checked all plugs, looked at wires controlling individual injectors, can not determine what is causing the engine to run excessively rich
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