Temp Sensor
Yes, and this is exactly what I was seeing. It would eventually get up to 170, but not much more than that while my head temp would be 210 or better. I had to set the fan temps in the Fitech in the high 160s to compensate.
I have now replaced the sensor with the Delphi one and completely it fixed my problem. It’s reading correctly. Also solved over enrichment starting and after start fuel issue I had once it was warmed up (which makes perfect sense). It also warms up faster now because it’s not overly rich. I’m a happy guy!
Hi,
I have recently joined this forum. I have a stroked Ford 5.0 with the GO EFI 600HP kit and Aeromotive Phantom pump in the tank. My Speedhut temperature gauge has consistently read about 20 degrees warmer than the FiTech handheld. I have had problems with rich mixture as well as an idle that acts like the spark plugs are randomly shorting out. The motor has about 100 miles on it so I am working a few issues and eliminating variables as I sort it out.
After reading this forum and finding out about the temperature sending unit issues I decided it was time to look into changing the sender with a AC Delco 213-928. Being the geek I am I also wanted to know "how" the senders electric resistance changed with temperature. I rigged up a holding fixture to suspend the two senders in water while it heated on the stove. I used a digital thermocouple to monitor the water temperature from room temp to 200 F.
The Packard Electric/AC Delco spec has a table of the sender designed resistance and allowable tolerance. The resistance tolerance is given as a percentage of the measured resistance and is a gradually decreases as the resistance decreases. This chart I made shows the two resistance limits as the gray lines on either side of the orange line (the nominal design resistance). The FiTech sender data is the yellow line and you can see that the resistance consistently greater than the allowable in the temperature range we are most interested in, 120 - 200 F.
The blue line is the AC Delco sender resistance data and it is right on top of the design resistance target from 120 - 200 F.
Hope this is useful info.
Andy
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I changed to the delco and everything reads evenly, your other issue about your plugs check or change your 02s to a better brand I did runs perfect now