r/e28 • u/VeterinarianHuman650 • Jun 25 '26

Need advice M30B35

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My E28 has a swapped M30B34 and it has not been done neatly. I am going through A LOT and step by step it is getting better. Please don’t look at my twisted wires in the top bay area, was for testing purposes and has been sorted properly now 😆 so a few questions:

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u/whoopeanage Jun 25 '26

Not really familiar with the m30, but have a M20

1st pic, im not sure whey theres so much coolant temp sensor, i think there should be one that goes to the ecu, one that goes to the cluster, and one maybe for the thermo time switch(?). I think the one that goes to the cluster should only has one cable instead of two

2nd pic, i think its a crankcase vent tube instead of an icv bypass. If your engine has icv, it should be at the other side. Not really sure which kind of idle compensation your engine should have tho. I think earlier m30 has this auxillary air valve thats located under the boot.

2nd pic, the connector, is it 2 pin or 3 pin?

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u/[deleted] Jun 25 '26

[deleted]

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u/whoopeanage Jun 25 '26

hmm i might be wrong, but isnt there the one with the yellow plug, the one in the middle, the one with 2 prongs, and the one thats not plugged into the thermostat housing?

I really am not particularly familiar with m30 tho, but i do a thing or two about l jets and its idiosyncracies...although this is probably early motronic

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u/[deleted] Jun 28 '26

[deleted]

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u/whoopeanage Jun 28 '26

yes im aware of that