As many of you know I replaced my engine last spring and since then have had nothing but grief. However we are getting close.
Long story short my fuel consumption at trawler speed is the same as running at 3800 rpm. As measured by fuel flow sensor.
When engine is cold I can start easily with no throttle. Same when engine is hot. Engine idles normally. However when the engine is warm say 140F I have to give it 3/4 throttle to get it to start and then I have to keep it around 1000 rpm to keep it running until it is warm > 170F on the gauge.
Now my theory. If the engine temperature sensor ( the one connected to the ECM ) is out of calibration and reads low then the ECM thinks the engine is running colder than it really is and therefore gives it more gas. On my dash gauge running at 3800 temp indicates 185F when at trawler it reads around 170F. A out of calibration sensor will not give a fault because it is not failed but simply not reading accurately.
When plugged into the computer there are no error codes However at idle on the muffs the engine never really gets to normal operating temperature as indicated on the computer and the pulse width on the injectors is longer than normal ( as if the ECM is giving a little choke )
SOOOO I am thinking I change that sensor. Opinions please
7.4L MPI
Thanks
Long story short my fuel consumption at trawler speed is the same as running at 3800 rpm. As measured by fuel flow sensor.
When engine is cold I can start easily with no throttle. Same when engine is hot. Engine idles normally. However when the engine is warm say 140F I have to give it 3/4 throttle to get it to start and then I have to keep it around 1000 rpm to keep it running until it is warm > 170F on the gauge.
Now my theory. If the engine temperature sensor ( the one connected to the ECM ) is out of calibration and reads low then the ECM thinks the engine is running colder than it really is and therefore gives it more gas. On my dash gauge running at 3800 temp indicates 185F when at trawler it reads around 170F. A out of calibration sensor will not give a fault because it is not failed but simply not reading accurately.
When plugged into the computer there are no error codes However at idle on the muffs the engine never really gets to normal operating temperature as indicated on the computer and the pulse width on the injectors is longer than normal ( as if the ECM is giving a little choke )
SOOOO I am thinking I change that sensor. Opinions please
7.4L MPI
Thanks
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