Information on Check Engine light

hssssssss · 10-18-2001, 09:36 PM

Last weekend I installed an off-road H pipe. Of course now I have a check engine light on and I would like to trick the PCM into thinking I still have a cat (in case I get a "real" check engine light). Does anyone know how the "dummy" O2 sensors work. Are they passive or active? I think all I need to do is put in a 2-3 second delay into the secondary O2 sensor but I don't know how to package the delay as it gets very hot and sometimes wet underneath the car. Any suggestions besides wimping out and buying a "dummy" O2 sensor?

Mercury · 10-18-2001, 11:12 PM

My friend Tim C and I made our own MIL eliminators. Dont remember the part numbers but we were able to buy everything needed at Radio Shack for about 6 dollars. We used a small project Case and some hotglue.

His and his brother in laws (2001 GT Convert) are working great. Mine on the other hand doesnt. Check engine light comes on every now and then, setting a 02 sensor/possible missfire code.

------------------
64 1/2 "D" code Red Mustang Coupe. 289, C4, Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 valves, 11:1 comp, 1.7:1 rockers, blue wolverine lumpy cam, modified 4100 Hipo 4 barrel. GT Apperance pkg. And to many others to list

2000 Perf Red Mustang GT. 5spd. BBK Underdrive pulleys, Flotech off-road H pipe. Hurst T-Handle, 40 series Flowmasters, Steeda Tri-Ax. Ordered 4:10's.

64 1/2 red 6cyl coupe. Future resto.

10-18-2001, 09:36 PM	#1
hssssssss Registered Member Join Date: Jun 2001 Location: Dublin, OH. Posts: 2	Information on Check Engine light Last weekend I installed an off-road H pipe. Of course now I have a check engine light on and I would like to trick the PCM into thinking I still have a cat (in case I get a "real" check engine light). Does anyone know how the "dummy" O2 sensors work. Are they passive or active? I think all I need to do is put in a 2-3 second delay into the secondary O2 sensor but I don't know how to package the delay as it gets very hot and sometimes wet underneath the car. Any suggestions besides wimping out and buying a "dummy" O2 sensor?

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10-18-2001, 11:12 PM	#2
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	My friend Tim C and I made our own MIL eliminators. Dont remember the part numbers but we were able to buy everything needed at Radio Shack for about 6 dollars. We used a small project Case and some hotglue. His and his brother in laws (2001 GT Convert) are working great. Mine on the other hand doesnt. Check engine light comes on every now and then, setting a 02 sensor/possible missfire code. ------------------ 64 1/2 "D" code Red Mustang Coupe. 289, C4, Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 valves, 11:1 comp, 1.7:1 rockers, blue wolverine lumpy cam, modified 4100 Hipo 4 barrel. GT Apperance pkg. And to many others to list 2000 Perf Red Mustang GT. 5spd. BBK Underdrive pulleys, Flotech off-road H pipe. Hurst T-Handle, 40 series Flowmasters, Steeda Tri-Ax. Ordered 4:10's. 64 1/2 red 6cyl coupe. Future resto.