Hello Community,
My M52TU swapped E30 has a massive problem with the idle. It's an M52TU28B from a E46 328Ci with custom tune on a MS42 ECU. Engine has a M54B30 intake manifold, M54B30 DISA Valve, M52 Throttlebody and Idlecontrolvalve.
When the engine is turned on it fires right up and idles at 5000rpm! No missfiring, no surging, just runs happily at 5000rpm straight. When i disconnect the ICV plug, it goes to idle at approx. 800-1200rpm but runs really rough and wont take any gas!
I tried to clean the ICV with brake cleaner, it opens and closes fine, just stays fully open when engine is turned on.
Stuff i tried already:
Only two codes are thrown by the ECU:
Any help is much appreciated!
Greetings from Bavaria,
Sebastian
PS: i ordered a replacement ICV yesterday...
My M52TU swapped E30 has a massive problem with the idle. It's an M52TU28B from a E46 328Ci with custom tune on a MS42 ECU. Engine has a M54B30 intake manifold, M54B30 DISA Valve, M52 Throttlebody and Idlecontrolvalve.
When the engine is turned on it fires right up and idles at 5000rpm! No missfiring, no surging, just runs happily at 5000rpm straight. When i disconnect the ICV plug, it goes to idle at approx. 800-1200rpm but runs really rough and wont take any gas!
I tried to clean the ICV with brake cleaner, it opens and closes fine, just stays fully open when engine is turned on.
Stuff i tried already:
- ICV cleaned
- CCV replaced
- vacuum hoses replaced
- injection valves swapped with a different set
- DISA valve rebuild
- Airmassflow sensor swapped (now i have 3 different brands to swap around)
- intake hoses replaced
- checked if throttlebody is closed at engine start (is completly closed)
- reset the adaptions in the ECU with INPA
Only two codes are thrown by the ECU:
- throttlebody position not found
- thermostate temperature not plausible
Any help is much appreciated!
Greetings from Bavaria,
Sebastian
PS: i ordered a replacement ICV yesterday...
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