View Poll Results: Did it work? Unplugging the O2 sensor
Yes
2
33.33%
Nope
4
66.67%
Voters: 6. You may not vote on this poll
Anyone with hesitation Try this!!!
Passenger
Posts: n/a
Anyone with hesitation Try this!!!
Hello all here is something for you guys out there that still have hesitation. I am almost sure this will clear it up 99% of at least. So try it. I have done it on 2 cars now both using PFS PMC system. It works awsome so give it a shot and let me know if it works for you guys.
So:
1.)Unplug the O2 sensor from the connection point just behind the UIM turbo side.
2.)Take her for a spin.
Let me know.
-Rikki
So:
1.)Unplug the O2 sensor from the connection point just behind the UIM turbo side.
2.)Take her for a spin.
Let me know.
-Rikki
Hey, where did my $$$ go?
Joined: Feb 2001
Posts: 4,413
Likes: 0
From: Bimingham, AL
How is that going to affect close loop though??? Closed loop is where the computer looks at the O2 sensor to determine if its rich or lean and makes changes accordingly.....thats really all the O2 is used for.
It might be that the PFS PMC doesnt use closed loop.....but if that were the case I dont see why unhooking the O2 sensor would change anything.
I have a PFC and I dont use my O2 sensor at all. You can turn the O2 sensor off on the PFC and it will read from the fuel map at all times instead of running closed loop.
STEPHEN
It might be that the PFS PMC doesnt use closed loop.....but if that were the case I dont see why unhooking the O2 sensor would change anything.
I have a PFC and I dont use my O2 sensor at all. You can turn the O2 sensor off on the PFC and it will read from the fuel map at all times instead of running closed loop.
STEPHEN
Originally posted by rotary-tt
That just masks the problem if you use the stock cpu by running the motor richer. It does not get to the root of the problem...
That just masks the problem if you use the stock cpu by running the motor richer. It does not get to the root of the problem...
Rotary Freak
Joined: Aug 2001
Posts: 1,734
Likes: 0
From: maryland
Re: Anyone with hesitation Try this!!!
Originally posted by Dont_Be_A_Rikki
Hello all here is something for you guys out there that still have hesitation. I am almost sure this will clear it up 99% of at least. So try it. I have done it on 2 cars now both using PFS PMC system. It works awsome so give it a shot and let me know if it works for you guys.
So:
1.)Unplug the O2 sensor from the connection point just behind the UIM turbo side.
2.)Take her for a spin.
Let me know.
-Rikki
Hello all here is something for you guys out there that still have hesitation. I am almost sure this will clear it up 99% of at least. So try it. I have done it on 2 cars now both using PFS PMC system. It works awsome so give it a shot and let me know if it works for you guys.
So:
1.)Unplug the O2 sensor from the connection point just behind the UIM turbo side.
2.)Take her for a spin.
Let me know.
-Rikki
Yeah I was the ginuea pig.
Worked great for me so far.
You are my HERO! Everyone give it up for 93R1(you da man)Trending Topics
Hey, where did my $$$ go?
Joined: Feb 2001
Posts: 4,413
Likes: 0
From: Bimingham, AL
It could also be that your O2 is bad. When they start to go they read rich that means your ecu is going to pull back with the fuel.
Rikki if you had hesitation probs you prob just needed to add fuel to some cells, thats all unpluging the O2 is doing more than likely. Get Peter to go over your light throttle fuel, its prob just too lean. Unhooking the O2 is probably making it super rich.
STEPHEN
Rikki if you had hesitation probs you prob just needed to add fuel to some cells, thats all unpluging the O2 is doing more than likely. Get Peter to go over your light throttle fuel, its prob just too lean. Unhooking the O2 is probably making it super rich.
STEPHEN
Rotary Freak
Joined: Aug 2001
Posts: 1,734
Likes: 0
From: maryland
Peter told me:
The hesitation/bucking(NOT 3K) at light throttle is caused due to a lean misfire. The factory(Mazda) maps are programmed this way for emissions purposes, the PMC "amplifies" these maps and makes it more noticable.
By unplugging the o2 sensor the ecu does not see the light throttle lean condition and try to compensate for it, thus causing the hestiation/bucking.
Its just a band-aid for a bigger problem.
The hesitation/bucking(NOT 3K) at light throttle is caused due to a lean misfire. The factory(Mazda) maps are programmed this way for emissions purposes, the PMC "amplifies" these maps and makes it more noticable.
By unplugging the o2 sensor the ecu does not see the light throttle lean condition and try to compensate for it, thus causing the hestiation/bucking.
Its just a band-aid for a bigger problem.
Senior Member
Joined: Mar 2001
Posts: 712
Likes: 0
From: winston-salem, nc
yeah, the O2 trick is an old one which, if it does work for a bit, will not solve the problem (usually) and it will come back. trying to play with the fuel maps around 3K is again a wasted effort.
Assuming you have already cleaned, and added bigger, better and more grounds, the best thing to do is unplug the PMC from the car, and drive it around for a day with just the stock ECU. Then plug the PMC back in -
of course, if you have improper fuel pressure, dirty or dripping injectors, or bad grounds, you should take care of that too.
Assuming you have already cleaned, and added bigger, better and more grounds, the best thing to do is unplug the PMC from the car, and drive it around for a day with just the stock ECU. Then plug the PMC back in -
of course, if you have improper fuel pressure, dirty or dripping injectors, or bad grounds, you should take care of that too.
Rotary Freak
Joined: Aug 2001
Posts: 1,734
Likes: 0
From: maryland
Originally posted by silver93
yeah, the O2 trick is an old one which, if it does work for a bit, will not solve the problem (usually) and it will come back. trying to play with the fuel maps around 3K is again a wasted effort.
Assuming you have already cleaned, and added bigger, better and more grounds, the best thing to do is unplug the PMC from the car, and drive it around for a day with just the stock ECU. Then plug the PMC back in -
of course, if you have improper fuel pressure, dirty or dripping injectors, or bad grounds, you should take care of that too.
yeah, the O2 trick is an old one which, if it does work for a bit, will not solve the problem (usually) and it will come back. trying to play with the fuel maps around 3K is again a wasted effort.
Assuming you have already cleaned, and added bigger, better and more grounds, the best thing to do is unplug the PMC from the car, and drive it around for a day with just the stock ECU. Then plug the PMC back in -
of course, if you have improper fuel pressure, dirty or dripping injectors, or bad grounds, you should take care of that too.
I've had mine unhooked for about 1800 miles. No CE light yet and no hesitation.
We are not referring to the 3K hesitation in this post. Unhooking the o2 sensor probably will not have any effect the 3k hesitation at all.
Hey, where did my $$$ go?
Joined: Feb 2001
Posts: 4,413
Likes: 0
From: Bimingham, AL
But it will create a overly rich condition. If you have the PMC why not just richen up the fields that are lean???? By unpluging the O2 your going to make it overly rich.
My stock computer never had this problem....I wonder if the maps were changed sometime between 93 and 95 to smooth things out.
Rikki, if you pull the pmc out and just drive around with the ecu only do you have these problems??? It might just be tuning that needs to be cleaned up with the PMC
STEPHEN
My stock computer never had this problem....I wonder if the maps were changed sometime between 93 and 95 to smooth things out.
Rikki, if you pull the pmc out and just drive around with the ecu only do you have these problems??? It might just be tuning that needs to be cleaned up with the PMC
STEPHEN
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