BS3 O2 sensor giving bad readings under WOT, help needed!
11-01-2008, 06:04 PM
#1
BS3 O2 sensor giving bad readings under WOT, help needed! Has anyone ever had a O2 sensor on a BS3 car freak out? It reads fine most of the time, but under WOT it will go right at 14.4 A/F and stay there, then go back to reading properly. It doesn't gradualy go up, it shoots straight up, and stays at the 14.4 constantly, until it knose dives back down to what the real reading is. The tuner wanted to try out a new wideband, we put it on, and the same thing happened.
The next things he wants to try, is to reroute the wideband cable, to make sure its not picking up inferance from something else. The other thing he mentioned is that the voltage is dropping down 10.8 at the end of a WOT run, and maybe that has something to do with it. What do you guys think? This is a very knowledgable and well respected tuner, so I do trust him. I just would like to hear more ideas on things that I can try out. What do you guys think? I can post the BS3 logs if needed. Thanks
The next things he wants to try, is to reroute the wideband cable, to make sure its not picking up inferance from something else. The other thing he mentioned is that the voltage is dropping down 10.8 at the end of a WOT run, and maybe that has something to do with it. What do you guys think? This is a very knowledgable and well respected tuner, so I do trust him. I just would like to hear more ideas on things that I can try out. What do you guys think? I can post the BS3 logs if needed. Thanks
11-01-2008, 06:29 PM
#2
8 Second Club
iTrader: (40)
Join Date: Aug 2005
Location: Raleigh,North Carolina
Posts: 1,861
Likes: 0
Received 0 Likes
on
0 Posts
I would think the low voltage would be causing an issue, especially at WOT, where the voltage demands would be highest. A booster pack would confirm on the dyno.
11-03-2008, 09:24 AM
#5
Volt booster???
Fix the problem w/ the system.
Wiring?
Alternator output?
Battery?
A VB IS NOT the way to correct this.
Fix the problem w/ the system.
Wiring?
Alternator output?
Battery?
A VB IS NOT the way to correct this.
There are just a lot of things on the car. BigStuff3 computer, electric water pump, methanol injectin pump, Magnafuel 4303 fuel pump that draws ALOT of power, trans cooler fan, and other little stuff.
11-03-2008, 09:25 AM
#6
TECH Senior Member
iTrader: (21)
Join Date: Nov 2001
Location: Cecil County Raceway!!!
Posts: 8,484
Likes: 0
Received 0 Likes
on
0 Posts
the voltage messes with it...I threw an alt belt and my voltage dropped into the 10s and my WB showed dead lean (like yours) but it was really stupid pig rich (black smoke)
is the BS3 wired directly to the battery (both hot and ground)?
is the BS3 wired directly to the battery (both hot and ground)?
Trending Topics
11-03-2008, 07:27 PM
#8
A system that costs that much should have much better control over the sensor.... of course a system that costs that much (and controls things that cost a bunch) really has no business with a cheapo Bosch WBO2 anyway.
It would be really nice to have NGK WB support with BS3, especially given the number of cars wanting to run leaded fuel.
It would be really nice to have NGK WB support with BS3, especially given the number of cars wanting to run leaded fuel.
01-06-2011, 10:57 PM
#10
FormerVendor
I've seen this happen on a few BS3 cars. Re-routing the wideband wire as far away from the ignition wires helps. I've also been able to make the problem appear/disappear by switching from non resistor to resistor spark plugs.
