Heated O2 Sensor and 165 ECM
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Joined: Aug 2003
Posts: 466
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From: Bakersfield
Car: 1985 IROC-Z
Engine: 1989 350 4 bolt roller block
Transmission: ProBuilt 700R4 Road Race with Edge 9.5" 2800 stall lockup converter
Heated O2 Sensor and 165 ECM
I read the post on the Heated O2 and the $8D, but that is for a 730 ECM IIRC. What I was wondering is if the heated O2 sensor will change things on the $6E on my 165 computer the same way.
I'm in the market for a new O2 sensor because it has a Bosch sensor (new) that a mechanic installed (while I was laid up from knee surgery) when my old one died. I cringed when I heard it because I have yet to find anything Bosch that was any good except maybe their coils and the "occasional" MAF.
I'm changing the O2 sensor due to a severe surging problem at idle. (IAC ok) I changed the new MAF to my old gutted unit yesterday and it calmed down to the extent it doesn't die all the time. But it didn't take care of the problem.
Since I have the car jacked up off the ground to remove the passenger side header, I thought now would be a good time to switch to a heated O2. I figured it would be less likely to foul than a straight O2. I'm running really rich right now but I won't have a chance to install the PROMinator and make any programming changes until Tuesday night at the earliest. I would really like to drive the car to my birthday party this Saturday after my repairs are completed and not toast the O2 sensor....
I'm in the market for a new O2 sensor because it has a Bosch sensor (new) that a mechanic installed (while I was laid up from knee surgery) when my old one died. I cringed when I heard it because I have yet to find anything Bosch that was any good except maybe their coils and the "occasional" MAF.
I'm changing the O2 sensor due to a severe surging problem at idle. (IAC ok) I changed the new MAF to my old gutted unit yesterday and it calmed down to the extent it doesn't die all the time. But it didn't take care of the problem.
Since I have the car jacked up off the ground to remove the passenger side header, I thought now would be a good time to switch to a heated O2. I figured it would be less likely to foul than a straight O2. I'm running really rich right now but I won't have a chance to install the PROMinator and make any programming changes until Tuesday night at the earliest. I would really like to drive the car to my birthday party this Saturday after my repairs are completed and not toast the O2 sensor....
Last edited by Captain C; Aug 13, 2004 at 01:40 PM.
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Joined: Nov 2003
Posts: 299
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From: The Netherlands
Car: Cobra Kit Car
Engine: 350 HSR
Transmission: TKO 600
Axle/Gears: 3.31
Hi “Capitan C”,
I heated sensor will not change anything on your $6E it will give the right information and your ECM will work properly.
I get with the AC Delco AFS-74 a signal varying from 4mV till 950mV.
I have followed the information of RBob related to the heated O2 sensor.
I have a very good experience with this one.
Initially I did connect the 12v (power) via a relay linked to the CCP signal, but because of the relay noise I did change for a keyed 12v connection.
Part number for the sensor.
25312179 (AFS-74)
Weather pack counter connector.
12126012
Happy birthday tomorrow.
Regards,
Cobra289
I heated sensor will not change anything on your $6E it will give the right information and your ECM will work properly.
I get with the AC Delco AFS-74 a signal varying from 4mV till 950mV.
I have followed the information of RBob related to the heated O2 sensor.
AC Delco AFS-74. This is a GM sensor that is tuned to the GM ECM PID fueling algorithm.
Not all O2 sensors are created equal. The biggest difference I have found with this particular sensor (AFS-74) is that the AFR vs. output voltage is not as steep as other sensors. This allows the fueling algorithm to have better control over the actual AFR.
Having driven vehicles and data logging the O2 sensor values of various sensors such as Ford (Bosch), Chrysler (NGK), and a universal Bosch, the AFS-74 gave the best drivability and most consistent output voltage curves.
Not all O2 sensors are created equal. The biggest difference I have found with this particular sensor (AFS-74) is that the AFR vs. output voltage is not as steep as other sensors. This allows the fueling algorithm to have better control over the actual AFR.
Having driven vehicles and data logging the O2 sensor values of various sensors such as Ford (Bosch), Chrysler (NGK), and a universal Bosch, the AFS-74 gave the best drivability and most consistent output voltage curves.
Initially I did connect the 12v (power) via a relay linked to the CCP signal, but because of the relay noise I did change for a keyed 12v connection.
Part number for the sensor.
25312179 (AFS-74)
Weather pack counter connector.
12126012
Happy birthday tomorrow.
Regards,
Cobra289
Thread Starter
Member
Joined: Aug 2003
Posts: 466
Likes: 0
From: Bakersfield
Car: 1985 IROC-Z
Engine: 1989 350 4 bolt roller block
Transmission: ProBuilt 700R4 Road Race with Edge 9.5" 2800 stall lockup converter
Thanks for the information!!!!!! It would be a happier birthday if I didn't have to work on the car..... I have two trips out of town on the next two weekends ( 300 miles round trip) and then a 1500 mile round trip out of state in September. I want the car running as well as possible by then.
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