Felt a bit left out, Stu, so thought Id ask you about my lambda sensor...

Now a wideband one, and still keep killing it.

After a while the gauge seems to only read 14.83 (not accurate).

Is the sensor fubared, and wot killed it do you reckon?

Stage 3 with greens and bayjoo chip and t35 hybrid turbo

JJ

 

How do you know that the 14.8 isnt accurate?

 

Cos it just sits there after a while irrespective of how much you hit the throttle and release it (ie from no throttle to WOT)

It seems to start okay when first used, and then as it 'warms up' (including sat in traffic)

I am sure it is wrong, cos it just then sits there at 14.83

JJ

 

Ah, got you.
What sensors are you using? Are you sure your wiring is ok? Ive never had any problems like this and i have fitted and used a LOT of lambdas over the years...

 

Currently, it is a Tech Edge WB02 Wide Band gauge and controller, using a Bosch LSU 6066 sensor.

It was only installed about 6 months ago, and has spent 3 months of that off the road!

I think the wiring is okay, it is all new - lambda sensor is located in downpipe approx 4 inches from flange

 

Do I have you stumped?

JJ

 

Without seeing iet yes, im afraid you do mate. Sorry.

 

4 inches from the turbo flange can be a bit hot for certain wide band sensors. Try mounting the new one a bit further down stream but before and not too near any joints. Also make sure any exhaust sealant you use does not contain silicone.

 

Not a bad suggestion this. I have another boss at the lower part of the downpipe. I will try this with the next to see how it gets on. I think that the heat thing is the most likely culprit. I cant think of anything else that would kill it. Others have mentioned it poss running too rich. This is possible, but I think that may kill it alltogether

JJ

 

You have had a few die though havent you?

I seem to recall this from previous posts...

 

Running very rich (8:1) can shorten their life as can fruity high octane race fuels.

 

Well remembered! I had a narrow band lambda sensor die in a similar way. I had put this down to shoddy parts, but the latest one makes me think otherwise!

Garage - ref the 8 odd:1, there is no way she runs that rich!

JJ

 

I should hope not to! However I have seen a couple of cossies set up running nearly that rich in the past

 

Hey mate - are you still playing with your S8? I seem to recall that you had one. Mine is currently on my "projects awaiting further time and attention" list!

JJ

 

good point that .. so where is the best place to fit a sensor and also ... is there a sensor that will last that close to the turbo???

 

About 4 - 6 inches from the turbo works well, i have fitted hundreds there and never lost a sensor due to heat. Do you realise a heated sensors tip is at 800C+ at all times folks? They are designed to get very hot indeed.

 

Hmmmm. This is most confusing. I will have to work out exactly what my engine is doing to these poor gauges to kill them! It cant be a coincidence that two have failed now.

What about oil? The car does smoke on overrun. Could this clog/ kill a sensor?

JJ

 

thanks stu will have to get on with fitting mine .. soon ..

 

Yes mate, you may have nailed it there.
Get yourself a sensor shield and shield the direct flow side of teh sensor so it cannot pick up particulate matter.

 

Nice one Stu! I'll give it a go!

Thanks for all your input Stu (you and others also!)

JJ