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lambda Questions.
Topic Started: Mon Nov 12, 2012 8:22 am (947 Views)
aemt
Serial 190E Owner
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Can anyone tell me where abouts on the exhaust system itself the actual sensor is fitted.

If it is not fitted can the sensor itself be retro fitted into the exhaust pipe; or does the relevant exhaust section need to be replaced.

I am assuming that if there is no sensor in the exhaust the lambda unit itself will signal a fault to the ECU which will then switch to

emergency mode and thus lead to massive overfueling.

Many thanks in advance
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aemt
Serial 190E Owner
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Having checked EPC I am not even sure that my car came with a Lambda sensor when new even though it is a '93 car.

It could well be that it was not fitted on South African Models.

New OVP, plug check, new injectors earlier in the year and vacuum system check do not seem to have sorted my over fuelling problem and consumption problem.

Anyone any ideas?

Edited by aemt, Mon Nov 12, 2012 9:56 am.
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mazza
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More than part of things
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aemt
Mon Nov 12, 2012 9:55 am
Having checked EPC I am not even sure that my car came with a Lambda sensor when new even though it is a '93 car.

It could well be that it was not fitted on South African Models.

New OVP, plug check, new injectors earlier in the year and vacuum system check do not seem to have sorted my over fuelling problem and consumption problem.

Anyone any ideas?

Hi

when did you last have the CO checked using a gas analyser???

is it possible that the idle mixture just needs a little tune up


check this thread http://mercedes-190.co.uk/topic/6710308/

Summary... mixture was running at 4% and for economy it should be running at 1% + or - .5%

Cosrob's mechanic set it at 1.3%

Have the CO checked using some decent equipment

mazza
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aemt
Serial 190E Owner
[ *  *  *  *  *  * ]
Hi Mazza,

Had it checked and adjusted 2 weeks ago. Consumption has got slightly worse if anything.

I will get it re checked this week just in case they made an error.
Edited by aemt, Mon Nov 12, 2012 10:23 am.
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mazza
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aemt
Mon Nov 12, 2012 10:22 am
Hi Mazza,

Had it checked and adjusted 2 weeks ago. Consumption has got slightly worse if anything.

I will get it re checked this week just in case they made an error.
Hi mate

Sounds like a good idea mate!

Get some CO reading numbers if possible

all the best

Mazza
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sj190
More than part of things
[ *  *  * ]
lambda sensor located on down pipe by left foot
wires 1/4 turn and pull

if not there in floor pan under carpet

take it out and clean

are your plugs the right colour
excessive fuel , if you have checked the obvious , how about you air flow sensor plug and cold start relay . cold start valve . it may telling itself the car is still cold hence on choke
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aemt
Serial 190E Owner
[ *  *  *  *  *  * ]
Thanks SJ

Established there is no Cat on SA cars

Will get it back up the garage and test the rest of the sensors.

Fuel consumption is 17 mpg at best at the moment.

On a 5 speed manual in mixed driving I should be ( and used) to get twice that.
Edited by aemt, Mon Nov 12, 2012 1:52 pm.
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sj190
More than part of things
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just been sifting info ,have you got a cold start injector ,set up like a early car or have you got an electric rotary actuator 'because the rotary acc is driven by the ecu and not by the ambient sensor in the intake
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aemt
Serial 190E Owner
[ *  *  *  *  *  * ]
Almost certain I have the 5th injector for cold start.

This is getting beyond my scope as thing stand.

I will get it back up to the garage and get them to go right through it.

I think they only went so far last time.
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sj190
More than part of things
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aemt
Mon Nov 12, 2012 2:01 pm
Almost certain I have the 5th injector for cold start.

This is getting beyond my scope as thing stand.

I will get it back up to the garage and get them to go right through it.

I think they only went so far last time.
ok
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aemt
Serial 190E Owner
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I was actually hoping it was a simple lambda issue but looks like I am not that lucky.
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mazza
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aemt
Mon Nov 12, 2012 2:01 pm
Almost certain I have the 5th injector for cold start.

This is getting beyond my scope as thing stand.


Dont panic!!!


Which car has the problems??

mazza



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aemt
Serial 190E Owner
[ *  *  *  *  *  * ]
2.3 manual sportline. South African Import.

No panic. I am quite happy to sort most things.

But once it gets to a complicated diagnosis where you really do need all the tools and diagnostic equipment I am happy to let my indie sort it.

Especially at this time of year where there is no time in the week to do anything.

I really thought it was down to the lambda sensor being removed when they built and fitted my stainless exhaust.

But EPC suggests I never had one; and there are certainly no connectors floating around under the carpets to plug one in.

I had the vacuum system fully tested which came up with no leaks.

I was replacing the OVP anyway so fitted new MB one.

Plugs are ok.

But it is a significant reduction in economy and there is a whiff of fuel when engine is running which tends to suggest over fuelling.

Also had new injectors and seals earlier in the year.

I guess I need to run through all the sensors which could lead the ECU to thinking the car needed a fuel boost; or which is forcing it into emergency mode.
Edited by aemt, Mon Nov 12, 2012 2:41 pm.
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