![]() The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80?☌ (176?☏), the condition described above is very likely the cause of the DTC to set. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC to set. To determine if this condition is causing the DTC P0300 to set, review the Freeze Frame/Failure Records for DTC P0300. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. Ĭheck for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.Įxcessive Open Loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. Water contamination in the fuel system can cause a single cylinder to misfire as well as cause a random misfire, refer to Alcohol/Contaminants-in-Fuel Diagnosis. Refer to Fuel Injector Solenoid Coil Test. A malfunctioning fuel pump, a plugged filter, or a malfunctioning fuel system pressure regulator will contribute to a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or malfunctioning crankcase ventilation valve, or for vacuum leaks at the throttle body, exhaust gas recirculation (EGR) valve, and intake manifold mounting surfaces. Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. What do all the red gages mean on a oldsmobile intrigue 2000 when they light up red dont have a owners manual theres only one light i dont know. this is the warning light for the coolant level in the rad. ĭamaged accessory drive belt or driven accessoryĪ damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC. 2000 Intrigue I trouble light came on in my car it looks like a televison set with an arrow pointing down. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the Mass Airflow Sensor Replacement. Try operating the vehicle within the Failure Records conditions with the MAF sensor disconnected. If the misfire is random, check for the following conditions:Įnsure all connections are clean and properly tightened.Ī mass air flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for 3-way catalytic converter overheating are present. A misfire rate that is high enough can cause the three-way catalytic converter to overheat under certain conditions. ![]() By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events. The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. How many miles on the vehicle ? If over 100,000 K timing chain an gear wear can also cause this. Multiple misfires can be caused by a few different things, intake manifold vacuum leaks, low fuel pressure, basic things like plug wires an spark plugs needing to be changed if hasn't been done already.
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