I called Bosch tech re: slow oxygen sensors
#82
TECH Senior Member
Originally Posted by Slowhawk
I'm still thinking it's a computer/electrical problem. I've kept an eye on the last 10 cars I tuned from stock to big cams to blower setups.None of them switched slow at cruise like the car here
Originally Posted by joecar
With key on and engine off, at the NBO2 vehicle connector, you measured 11.5V on the heater circuit (11.5V - 0V); this seems low, I measured something like >12V on mine (it was almost equal to battery voltage).
Repeat this measurement with engine running (watch for your safety!) and post your results; if you're seeing less than 12V, I think that you may have found the problem that is causing the O2 switching codes.
Repeat this measurement with engine running (watch for your safety!) and post your results; if you're seeing less than 12V, I think that you may have found the problem that is causing the O2 switching codes.
(BTW: I don't use O2 sensors so I never had this problem).
#84
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Originally Posted by rush7
here's my dumb question: don't they have voltage boosters they use for fuel pumps to make them work harder? could this same device be applied to the o2 heaters in order to keep the heat higher and (theoretically) switching more efficient?
with TPS or something like that (boost heat with TPS
< 1V or something). Figuring out the heater power limit
might cost you a couple of victims. Probably need not
be as stout as the BAP but a used one would be fun
to play with.
Though finding ways to get more heat into the sensor
(like the drilling idea) and less out (local heat shields,
wrapping) might be less complicated a project.
#85
Back from the dead!
I'm still dealing with this crap.
I had the sensor codes turned off so I could get a sticker. I passed but I still want to fix this insufficient switching problem.
I cleaned all my grounds by scraping to metal, and I installed yet another set of 13111 Bosch sensors. When I look on my hand-held scanner, it's hard to tell for sure without a graph, but they seem to be switching much faster now, and the car seems to run better. I'll have the codes turned back on and see what happens.
I'm still dealing with this crap.
I had the sensor codes turned off so I could get a sticker. I passed but I still want to fix this insufficient switching problem.
I cleaned all my grounds by scraping to metal, and I installed yet another set of 13111 Bosch sensors. When I look on my hand-held scanner, it's hard to tell for sure without a graph, but they seem to be switching much faster now, and the car seems to run better. I'll have the codes turned back on and see what happens.
Last edited by ShevrolayZ28; 04-20-2007 at 11:05 PM. Reason: to protect the inocent lol
#87
Originally Posted by ShevrolayZ28
Back from the dead!
I'm still dealing with this crap.
I had Slowhawk turn my sensor codes off so I could get a sticker. I passed but I still want to fix this insufficient switching problem.
I cleaned all my grounds by scraping to metal, and I installed yet another set of 13111 Bosch sensors. When I look on my hand-held scanner, it's hard to tell for sure without a graph, but they seem to be switching much faster now, and the car seems to run better. I'll have Slowhawk turn the codes back on and see what happens.
I'm still dealing with this crap.
I had Slowhawk turn my sensor codes off so I could get a sticker. I passed but I still want to fix this insufficient switching problem.
I cleaned all my grounds by scraping to metal, and I installed yet another set of 13111 Bosch sensors. When I look on my hand-held scanner, it's hard to tell for sure without a graph, but they seem to be switching much faster now, and the car seems to run better. I'll have Slowhawk turn the codes back on and see what happens.
I was hoping to try that on mine, i probably will try it anyway
#88
Originally Posted by Skipper
So opening up the sensor's a bit as posted earlier hasn't worked for you?
I was hoping to try that on mine, i probably will try it anyway
I was hoping to try that on mine, i probably will try it anyway
Maybe we can track down the people that have opened them up and see how they're making out.
#89
Originally Posted by Viper
http://www.hptuners.com/forum/showth...2575#post82575
Read what soundengineer has to say about changing switchpoints on O2 sensors...
Read what soundengineer has to say about changing switchpoints on O2 sensors...
#91
Originally Posted by 2xLS1
Why do you expect a diagnostic test designed by GM engineering to run on a stock exhaust system to satisfy the EPA, to run and execute properly with headers and relocated O2 sensors?
#92
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I'll ask this -why do so few people have switching problems?I get probly 1 in 20 header cars that have a problem.The 19 have excellent switching while the 1 is slow and lazy.
I just had a car today that was switching slow.We cleaned the grounds -no help.Then we took out the brand new bosch sensors and put in used stock 02's. All fixed, switching real good now.
What I'm saying is that tuning very very rarely is the fix for this problem.It's ussually another problem causing it.
I just had a car today that was switching slow.We cleaned the grounds -no help.Then we took out the brand new bosch sensors and put in used stock 02's. All fixed, switching real good now.
What I'm saying is that tuning very very rarely is the fix for this problem.It's ussually another problem causing it.
#94
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Well,I've come to the conclusion that the aftermarket Bosch sensors suck Donky Dick Just had another car with the same problem,went through everything and the driver side would not switch over .600 volts (new sensor) Put in a new factory sensor and it now switches extremely fast from 0- .930 volts. It actually helped the pass. side bank speed up too.
#95
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We should start a log of issues with Bosch O2's. Everyone asks me why I think they're crap and I never have examples handy. All I can say is how I've noticed on several different cars issues with the Bosch sensors. It's like asking someone how they know getting kicked in the ***** hurts. I can't tell you the last time it happened to me. But, I know it hurt like hell...
#96
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Originally Posted by Slowhawk
Well,I've come to the conclusion that the aftermarket Bosch sensors suck Donky Dick Just had another car with the same problem,went through everything and the driver side would not switch over .600 volts (new sensor) Put in a new factory sensor and it now switches extremely fast from 0- .930 volts. It actually helped the pass. side bank speed up too.
FWIW - I pulled the freeze frame data when the codes turned on and they always turn on at 58-61 mph in D4 with 12% load and positive STFT's and LTFT's. The codes have never come on with 5% or less trims.
#97
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I just got the PO1133 P0133, but im pretty sure i have an exhaust leak, so hopefully this will fix it but im not 100% confident, becuase the codes came one 3 months after i installed my headers, and ive had a small exhaust leak the whole time.
I just dont want to have to weld my headers to my ypipe
I just dont want to have to weld my headers to my ypipe
#98
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Im having the same problem with these pieces of ****. When I took out my stockers to replace them with the Bosch 13111's I noticed that the element was shorter. I am sure thats why they suck with lts. I didn't think anything of it so I just put in oem Bosch's and it they worked great at first, then did the same ****. The ses light came on and it started surging.
I need to know what the part number is for the OEM sensors. I didnt have a problem with those with my lts. Are they Borg Warner's? I just want to get rid of this damn problem.
I need to know what the part number is for the OEM sensors. I didnt have a problem with those with my lts. Are they Borg Warner's? I just want to get rid of this damn problem.
#100
Originally Posted by 98Camarod
Im having the same problem with these pieces of ****. When I took out my stockers to replace them with the Bosch 13111's I noticed that the element was shorter. I am sure thats why they suck with lts. I didn't think anything of it so I just put in oem Bosch's and it they worked great at first, then did the same ****. The ses light came on and it started surging.
I need to know what the part number is for the OEM sensors. I didnt have a problem with those with my lts. Are they Borg Warner's? I just want to get rid of this damn problem.
I need to know what the part number is for the OEM sensors. I didnt have a problem with those with my lts. Are they Borg Warner's? I just want to get rid of this damn problem.
BTW, the stock sensors have the AC Delco name on them.