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Hi Max,
Sorry to hear you are inundated by codes. I would second Ryan's suggestion - a 113 is usually set when the ECU can't even get near to bringing the oxygen sensor off the roof, so to speak, at the rich end. I think the "injector problem" description was a prediction of the tech writers that leaky or open injectors would cause this, when practical experience has shown the excess fuel usually results from a stuck regulator or torn regulator diaphragm.
But to qualify the "usually" above, I had one set 113 for the opposite reason - stuck lean according to lambda, due to its reference being fouled by ATF from a tailshaft leaker - I think you may recall that one. It kept pouring on the fuel in an attempt to bring it into range...
Like Ryan says, it is a serious, CEL-setting code, not one you'd get from a lazy lambda sond, but running long in the over-rich black smoke mode will soot up the sensor to compound the problem. I agree with Ryan, you should lift the fuse to reset the adapting the ECU has done (if you haven't yet) to find out how quickly the 113 returns. Check for fuel in the FPR vacuum hose. If you're careful, you can "feel" for regulator operation by quickly and carefully squeezing the return hose (output of the regulator). A stuck regulator will have a non-existent or lazy return flow. If you do this with only the pumps running (4 to 6 jumper) you should hear the main pump grunt a bit on a good regulator.
If all seems right with the FPR, get a meter on your oxygen sensor, or use your nose to figure whether there's too much or not enough fuel.
Let us know which year and type you are working on. You mentioned incompatible ECUs, so I can only infer you have both LH3.1 and LH2.4.
--
Art Benstein near Baltimore
A backward poet writes inverse.
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