Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

I recently found out that there are two different O2 sensors specified by Ford for the 87-93 model year Mustangs. It appears that the DY-605 was used during 87-90 and the DY-606 was used from 90-93.

Does anyone know what the difference in the sensors are?

Here's a link to 50resto's site showing the different sensors specified for each year:
Mustang HEGO Sensors

Any input would be greatly appreciated.

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

Did Speed Density Mustangs have O2's?

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

:yup:

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

I'm looking around, but maybe its 3 and 4 wire sensors. Both have heaters but the 4 wire has also has the auxiliary ground for the heater circuit, as opposed to being grounded only through the exhaust or uses the common ground as the signal. :shrug:

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

Huh, and I though they just run off EEC control only. What does the computer use the input for because I was under the thought that the Speed Density cars did not do any "adaptive strategy" and fuel control.

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

Uses it for the same thing all other mustangs do, feedback for fine adjustments of the mixture under closed loop.

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

Nope, they are both 3-wire HEGOs.

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

Okay, couldn't remember if my 89 was a 3 or 4 wire. When did Ford go to 4 wire? Any idea?

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

My 86 has 3wire and it was speed density originally. It now is Mass Air and uses the same O2's. They are the E6 part number.

Re: Question About Stock EEC-IV HEGO Sensors / DY-605 vs. DY-606
 

This site explains some of the differences. The main difference is the connector. I have the one in fig. 5

http://www.tomco-inc.com/Catalog/c13%20oem2.pdf