Z3 1.9 Pre facelift M44 Engine. Lambada probe

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joneseric
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Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by joneseric » Sat 09 Jun, 2018 10:10

I am away from home at the moment and reading up on the Catalytic Convertor / Lambada probe installation on my car.
I have had the dreaded high Co2 MOT fail. Please could somone tell me how many lambada probes my car is supposed to have. I am sure the car has one pre cat probe, but when I look at RealOEM the parts diagram shows both a pre and post Cat installation. Any advice gratefully accepted.

Rgds

Eric

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colb
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  Z3 roadster 1.8 TU
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Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by colb » Sun 10 Jun, 2018 16:30

If you check oem using last six letters and numbers of your vin number the diagrams displayed will show a generic picture. If your car is not fitted with a part it will be greyed out in the diagram
Colb
1999 BMW 1.8 Z3
1998 Honda Deauville NT650V

joneseric
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Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by joneseric » Mon 11 Jun, 2018 17:00

Hi-Thanks for your advice, I got my wife to send the VIN and like magic RealOEM says my car has Qty 1 probe - pre cat.

Thanks

Eric

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BonBon
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  Z3 roadster 1.9

Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by BonBon » Wed 13 Jun, 2018 12:14

I assume your Cat Conveter itself may be knackered.

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Robert T
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  Z3 roadster 1.9
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Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by Robert T » Wed 13 Jun, 2018 19:10

CO2 (Carbon Dioxide) or CO (Carbon Monoxide)? Pre-facelift cars did not have a gCO2/km rating, so they are taxed in the over 1.5 litre category, and so I don't think they can test CO2 output. Certainly on my last MOT it just shows CO, HC and lambda. High CO can be that the car was not up to temperature when tested. How high was the HC reading?

Cheers R.

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Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
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Del
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  Z3 roadster 1.9

Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by Del » Wed 13 Jun, 2018 20:14

CO (carbon monoxide) measured in the UK MOT. High CO is caused by either overly rich mixture or failed (failing) catalytic converter. If the ECU has logged no sensor error codes I would guess at a failing catalytic converter :(

joneseric
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Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by joneseric » Fri 15 Jun, 2018 21:29

Hi, sorry for late reply, still in the Middle East fixing an aeroplane!

Robert, your correct the car is not plated, and only CO, carbon monoxide is measured.

Both fast idle and idle failed CO. HC was 103ppm and lambda was 1.015, so within the middle of the range.

The car was warm as I had just replaced the thermostat and the gauge was in the middle, also, my wife give it a good thrash to ensure it was warm.

She noticed a misfire around 3500rpm in 3rd and 4th gear, with noticeable hesitation.

Mileage is 62k. I do about 2k a year.

The cat is 2 years old, but it was a cheap one.

No fault codes, I have a inpa diagosntic setup with a 20 pin interface.

So: when I get home, it’s a new Walken type approved cat, new coil and ignition leads, and all pipes on the induction side checked, and not forgetting the MAF sensor.

I wil. Keep you posted and thanks again for the advice.

E

joneseric
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Re: Z3 1.9 Pre facelift M44 Engine. Lambada probe

Post by joneseric » Tue 07 Aug, 2018 12:33

An update!

The car had previously been failing the MOT emissions test with high CO. My car was reading 0.5. Today my car was tested and the CO was 0.06, this is a massive improvement.

The effort to get there was also massive and I guess if a garage had carried out the work the cost would have written the car off. Before I detail what i did, which was not out the ordinary, I am a qualified aircraft engineer with quite a lot of exprience in aero-engine-piston etc. I also have BMW diagnostic software and a recently purchased emission testing equipment.

- My first task was to test for airleaks around the induction system, a volatile spray was used sparingly, this resulted in small increases in rpm.

- Find the air leak!. The induction side was almost completely removed and checked for damage. Some pipes where a little loose on their stub connectors, these were replaced.

The following items were replaced as the idle was rough.

- Idle control valve replaced. — Bargin on ebay. OEM part.

- Cam position sensor replaced - Another ebay bargin.

- PCV replaced

Exhaust System

- Cat replaced with Type Approved item.

- All joints fitted with new gaskets.

Result

Lambda - Good

HC - Good

CO - 0.06!! Passed

Rgds

Eric

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