Air Temperature Sensor 13221A 1 How do you know when its bad?

[Djohns]

I have a 2000 280. I have been running rich on all cylinders forever. Now the boat wont run at high rpm. Lowered the fuel offset down to -2 on the DDT. Plug reads are looking better. Still not quite there yet. What are the symptoms of a bad air temp sensor? DDT shows different temperature at startup and operation. ie. 40 at startup and 70 during operation even though its 90+ outside? Is their a spec for this unit? Didn't see any in the manual. Heck ill just buy one. Anybody solved a problem like this? Makes sense that its rich based on my temp readings correct?

Thanks for your replies in advance

[flabum1017]

ddt won't show a fault unless the sensor is out of range, shorted or open...... 40 - 70 is in range. However, it is not reading right, showing cold and therefore making the motor run rich........ yup, the sensor needs replacement

[Flatlander]

Mine measured open and smoked like an absolute pig when first fired up....

[nelson edens]

This is for 260, maybe the same as 280

[flabum1017]

. 40 at startup and 70 during operation even though its 90+ outside?.


Is the ddt reading Celsius or Fahrenheit?

[Djohns]

UPDATE - Received my new air temp sensor in the mail today and hooked up the DDT for a side-by-side comparison.

Outdoor Temperature = 77F

Old Sensor - 46F - 16kohm
New Senor - 77F - 8kohm (The DDT spec is 8Kohm)

Nelson's chart appears to be inline with the readings if you don't have access to a DDT.

Thanks for sharing with the group Nelson

Yes I did remembered to turn the box back to factory offset. Wow that would not be nice!

OMG! What this mean is I have been running this motor hog rich for 10years!!

Thanks S&F

[flabum1017]

Get ready for some more speed