JD 445 Runs Rich but Only under Light Load: John Deere News  -- John Deere Tractors Discussion Forum and Review JD 445 Runs Rich but Only under Light Load: John Deere News -- John Deere Tractors Discussion Forum

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 06-01-2019, 13:14 Post: 198446
JLMiller



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Posts: 30
 JD 445 Runs Rich but Only under Light Load

I recently noticed that my 1998 JD 445 runs normally under nearly all conditions (slow, medium, & full throttle idle; full throttle medium load with mower engaged; and full throttle heavy load with mower engaged, traveling, and mowing). Under light load (full throttle, mower disengaged, traveling) it hunts or surges and blows some black smoke.

I checked the fuel pressure and flow rate. Both were well into the normal range. I replaced the fuel and air filters just on principle. Nothing changed.

I've gone through all the tests for the air temp, coolant temp, and MAP sensors. Resistance values are close to spec, and all the sensors respond properly: for the temp sensors, resistance goes down with increased temperature; for the MAP sensor, output voltage is near 5v under ambient conditions and drops with increased vacuum.

I disconnected one sensor at a time, and the injection status indicator light displayed the correct long / short blink sequences for each one. The one thing I did notice is that previously, if I started the engine during the initial 2-second fuel pressurization, I'd get a long-long-short-short blink sequence. Now, even if I start the engine with no initial pause, I don't get that indication.

Please tell me that I'm not looking at a fuel injection control module replacement to the tune of over $1.2K.






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