My 1999 Dodge Ram 1500 5.9L runs ok when it starts, but as it warms up the idle drops, it acts like it will stall(and occasionally does). Also on the road it works ok sometimes and floods other times will barely run. I'm getting P0172 as a code, ''System too rich,bank 1''. Just not sure what to look for in reference to that. Any ideas?
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Check the gauge by holding in the trip odometer reset button and turn key to run,hold button for 10 seconds this will iniate a diagnostics on all the gauges,and lights if gauge doesn't move during this test replace gauge,if it does move then check the wires on the plug at the engine coolant temp sensor (ects) you can check the sensor by using a ohms meter by unpplugging it and check ohm's or resistance when cold and then start engine as the engine warms up the ohm's reading should gradually lower as the sensor is a thermister and as it warms up the resistance will drop.
If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?
is there a CEL? on the newer cars like this they have o2 sensors that send a signal to the computer that tells it to richen the fuel mixture until it gets to a certain temp these sensors also help the computer maintain a stoichmetric A/F ratio of 14.7. this acts like a choke on old cars. there are also other sensors that pertain to this. if you can try to get it on a diagnostic to pin point what sensor is not functioning correctly.
1.Start by changing plugs and wires. 2.Check for vacuum leaks. With the engine running, wigglr every hose you can see, to make sure nothing is loose or cracked. 3.Change fuel filter. 4.Check timing. 5.Check air control valve. 6.Check idle control sensor.