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krasuskyp's Avatar
 
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,246
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wonky WB02

anyone experience an oddly behaving Bosch WB sensor?

I purchased a new one w/ my VEMS gauge years ago, and sometimes I get great readings

other times it locks up on boost @ 13.5

it's always 13.5, never anything else

I swapped in a used sensor and experienced the same unfort - this was quite a while ago (long story - remember I bought my car back after 18mo hiatus) so my recollection may be a bit fuzzy - but I'm still getting the odd behavior regardless

also, when the car is started, the gauge defaults to 21.8 and stays there for a good 5min before it starts trickling down and giving me a reading

no change in the car's running condition ever so doubting I've got some intermittent running issue - runs tits! I'm 14.7 @ 1025 idle (sometimes 15.0 @ 1100 when hot), low 14's cruise, high 13s decel, 11.2 on WOT boost until 5k then 12.4-12.5 or so to 6k, then 13.0 (BLWUR/headers/IC/Rarly), and most importantly I get flames when I lift

which leads me to another query... MPG

I see Brian and others reference 15mpg and higher... I ave a consistent (dead nuts consistent) 12.0. Granted... I drive - er - Just Not Right. But, that's sometimes.

Other times I'm coasting, or lugging in 4th @ 1200 and just letting the idle troll it along. So most tanks are a 50/50 mix of babying it and WOT 5500 shifts and many miles of 120-130 blasts.

any insight appreciated, it's rather annoying - both the WB02 wonkiness and the abyssmal MPG

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Paul... CT | '87 930 | '08 M3 6gang vert |
past:

| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 06-21-2013, 11:50 AM
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Chain fence eating turbo
 
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Sounds like the controller is the issue if you've used 2 different sensors with the same results.

My Innovate never stays constant, it fluctuates very rapidly between tenths of an AFR.
Old 06-21-2013, 12:23 PM
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the controller is the gauge itself in this instance

hope not, that fukker is permapressed into the f'n console... tiiiiiiiiiiight fit, doubt I can extract!

Oh, it doesn't go to 21.8 immediately upon start, starts off like 54.8 or some crap for a few moments, then 21.8 for the 5min

yes, freezes up @ a solid 13.5 @ WOT - tho on way home just now it worked more normally

I should have mentioned, the 02's placed @ northbynortheast just aft the 3LDZ
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Paul... CT | '87 930 | '08 M3 6gang vert |
past:

| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 06-21-2013, 01:38 PM
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Quote:
Originally Posted by Tippy View Post
Sounds like the controller is the issue if you've used 2 different sensors with the same results.

My Innovate never stays constant, it fluctuates very rapidly between tenths of an AFR.
Weird...my Innovate stays quite constant at constant throttle.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 06-21-2013, 06:53 PM
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Chain fence eating turbo
 
Join Date: Dec 2008
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As weird as this sounds, I have EFI with no WBO2 control - reason for small AFR changes based on noise in the EFI inputs.

But, he says it takes 5 minutes for a reading other than pure air plus a perfectly steady AFR under boost. If CIS is that perfect, why go EFI?

Old 06-21-2013, 07:05 PM
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