Need help at ECU bmw e30 m40 318i

[markus_74]

Hello,

I need help from member here.

My question does, the ecu for m40 318i for engine with catalitic converter/lambda sensor and without/NO Cat is same or not?

How to know it, because as I know the ecu bosch number is same 0261200520.

regards
markus

[Brianmoooore]

AFAIK, they're the same. There's a plug and socket in the engine loom on the bulkhead that has to be connected together when running without a lambda sensor, which connects up the CO adjustment pot. built into the air meter. When running with a lambda sensor, the CO control voltage is provided by the signal from it.
http://www.autolib.diakom.ru/CAR/BMW/19 ... /fig02.pdf
This diagram is for an M42, but the wiring is similar. You can see the plug and socket near the bottom of the diagram.

[markus_74]

AFAIK, they're the same. There's a plug and socket in the engine loom on the bulkhead that has to be connected together when running without a lambda sensor, which connects up the CO adjustment pot. built into the air meter. When running with a lambda sensor, the CO control voltage is provided by the signal from it.
http://www.autolib.diakom.ru/CAR/BMW/19 ... /fig02.pdf
This diagram is for an M42, but the wiring is similar. You can see the plug and socket near the bottom of the diagram.

thank you for the info Brian, but I'm difficult to find it in my car, I see a wire with plug that hang in the engine loom, but I can't find the plug and socket you, or does because my car is designed for without lambda sensor?

my other question related this lambda sensor, does afm with or without co adjustment pot is always same? example 203 and 134?
I also found that the latest 203 afm is provide with adjustment pot, but there is no screw adjustment inside. why?

[Alex]

NO

The Cat equipped ECU's are different to that of non cat cars, My ecu gave up and i fitted a Non cat ECU and it ran like a bag of Nails. I would imagine the same would apply if you fitted a cat ECU to a non Cat car.

The Car in question was also a 318i M40

[jmc330i]

I fitted a non-Cat ECU to my Cat equipped M40 and it ran fine.

[markus_74]

NO

The Cat equipped ECU's are different to that of non cat cars, My ecu gave up and i fitted a Non cat ECU and it ran like a bag of Nails. I would imagine the same would apply if you fitted a cat ECU to a non Cat car.

The Car in question was also a 318i M40

how I can know the code/part number of cat and non cat ecu?

[Alex]

I fitted a non-Cat ECU to my Cat equipped M40 and it ran fine.

Mine ran but was seriously down on power and didnt idle correctly

Well there was only one ECU that i'am aware of for cats and it has a green label ending in 387

[jmc330i]

No difference in mine - 1989 non-cat ecu fitted to a 1993 Cat car.

Is it possible yours was from a 316i??

[markus_74]

I fitted a non-Cat ECU to my Cat equipped M40 and it ran fine.

Mine ran but was seriously down on power and didnt idle correctly

Well there was only one ECU that i'am aware of for cats and it has a green label ending in 387

Ok, i see, so ecu for non cat is 157 and with cat is 387.

also the conclusion does all green label is with cat? and brown label is non cat? does it apply to M40 e36 engine also?

my friend has an e36 NOn Cat trouble ecu Bosch 0261200520 with brown label, so if I must replace it, I should get the same bosch 0261200520?

[town325i]

if you need one i should have one in stock

[gaszman]

got a non cat 1 in my shed 316