Apologize for the long thread but I have an issue I can't resolve. I had the plug corrosion problem on my 06 DF140 so I had the engine holder replaced and had to have a new (used) wire harness installed. Since the repair was done, the engine is running extremely rich at idle, plugs are completely fouled within 5 minutes. The intake manifold pressure is reading too high at 18-21 inHg, it should be around 8-10 at idle so this is telling the ECM that the engine is running faster than it actually is which is causing the Fuel Inj. Pulse Width to be way too high at around 7k - 8k micro-seconds, it should be around 3500 at most at idle. This is causing an excessive amount of fuel to be dumped into the cylinders while at idle. I have swapped ECMs, MAP sensor, VST, and CKP sensor and also did a cylinder leak down test (10% leak rate which isn't bad). From what I've seen from other printouts I believe the IAC valve is not an issue but I also don't see any change in the duty cycle when RPMs are increased so I could be wrong. Below is the engine data that I am getting using the SDS program from 7 different runs, it shows that when RPMs are increased the numbers actually get a little better, would anyone on here possibly be able to give me some thoughts on what the heck is going on with this engine?
| ENGINE SPEED | 1344 | 781 | 1531 | 1531 | 688 | 750 | 1344 |
| IGNITION TIMING | BTDC 10 | BTDC 14 | BTDC 10 | BTDC 10 | BTDC 5 | BTDC 15 | BTDC 10 |
| MANIFOLD ABSOLUTE PRESSURE | 419 | 464 | 353 | 353 | 553 | 471 | 393 |
| MANIFOLD ABSOLUTE PRESSURE | 55.9 | 61.8 | 47 | 47 | 72.7 | 63.3 | 51.9 |
| MANIFOLD ABSOLUTE PRESSURE | 16.52 | 18.57 | 14.04 | 14.04 | 21.49 | 18.72 | 15.35 |
| BAROMETRIC PRESSURE | 753 | 761 | 761 | 761 | 761 | 746 | 761 |
| BAROMETRIC PRESSURE | 100.4 | 101.4 | 101.4 | 101.4 | 101.4 | 99.4 | 101.4 |
| BAROMETRIC PRESSURE | 29.68 | 29.97 | 29.97 | 29.97 | 29.97 | 29.39 | 29.97 |
| CYLINDER TEMPERATURE | 55 | 38 | 43 | 43 | 66 | 46 | 41 |
| CYLINDER TEMPERATURE | 131 | 101 | 108 | 108 | 151 | 115 | 106 |
| INTAKE AIR TEMPERATURE | 27 | 33 | 31 | 31 | 30 | 27 | 38 |
| INTAKE AIR TEMPERATURE | 80 | 91 | 88 | 88 | 85 | 80 | 100 |
| BATTERY VOLTAGE | 14.87 | 12.82 | 14.06 | 14.06 | 13.77 | 14.58 | 15.09 |
| FUEL INJ. PULSE WIDTH | 7152 | 8772 | 5876 | 5876 | 8764 | 7728 | 6204 |
| INJECTED FUEL AMOUNT | 25 | 30 | 20 | 20 | 31 | 27 | 22 |
| FUEL PUMP DUTY | 53.2 | 68 | 62.4 | 62.4 | 64.8 | 57.6 | 56.4 |
| IAC VALVE DUTY | 48.8 | 50 | 51.3 | 51.3 | 50 | 26.3 | 50 |