Join Date: Dec 2009
Vehicle: 2001 Dakota 4x4 R/C
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No sensors before or after the 3rd cat, so no. It was having a problem not idling high enough once and a while before I took out the 3rd cat, and it had a running to rich code pop up twice (cleared it once, came back two weeks later, cleared it the same day I took out the cat 3-4 weeks ago, hasn't been back since).
The code was P0172 1/1 Fuel System Rich, which has a long list of shit it could be-
Intermittent condition, restricted fuel supply line, fuel pump inlet strainer plugged, fuel pump module, O2 sensor heater operation, O2 sensor, EVAP system operation, O2 sensor signal circuit shorted to voltage or open, TPS voltage greater than 0.92 volts with throttle closed, throttle position sensor sweep, MAP sensor operation, ECT sensor operation, engine mechanical problem, fuel filter/pressure regulator, PCM
I've seen pumps go bad before they quit before, if it was from the actual motor or just the in tank filter plugged I'm not sure.
I love problems like this, hasn't done it since that day, although it has randomly done it before then. The fuel pressure regulator and all that crap is on the pump, so hopefully replacing the pump will fix it. Ever since I bought it the regulator has leaked pressure back into the tank (pretty sure anyway, loses pressure after a few hours but no gas leaks anywhere), so buying the pump will fix that and the pump that's about to shit out, and hopefully the random messed up idle.
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