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Does anyone know how to stop rev hang with an M50B25?

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Common for people to refresh them 

 

However

Air leaks, grooved throttle body, dirty/sticky injectors wetting the intake tract, buggered throttle cable etc have seen all before 

General rule of thumb in bmw Internet world is to flash/chip the ecu 

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ICV sometimes lets too much air in / doesn't close enough - I've fixed it before with a socket (don't judge) stuffed into the pipe between it and the intake

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My E36 had a rev hang after being converted to manual. Apparently it was common when still using auto ECU and changing to manual one or flashing it to manual software would've fixed it. 

Edited by KwS

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