Something I found when Investigating Rough idle & Misfire & warm start issue.
Engine stalls when under load when at full operating temp and struggles to start when its warm. When engine cools down, it not longer misfires , smooth idle and not issue starting.
Did the usual as below
- Removed and Clean ICV with throttle body cleaner. Yes lots of crap came out.
- Fitted and its a lot better at idle but still have misfire when at operating temperature.
- Struggles under load when engine reaches operating temperature.
- Its is pointing to something Electrical/ignition as it misfire when everything is hot and under load
Update ( 11/6/2022 )
Found corroded Air temperature sensor terminal on Airflow meter. When temperature comes up to normal and stays hot , resistance goes out of spec and produces reading of negative (-14c )hence the MAF flap shuts and dumps fuel and stalls the engine ..Fixed the corroded terminal and all is good now
link to video after the fix .
https://youtu.be/tlsjNwb8Lzs
link to video before the fix
https://youtu.be/tr7QbIpwjUc
https://youtu.be/Br6O_poWoUA
Another area to look at when troubleshooting rough Idle issue
03/1989 E24 635csi Rough idle & warm start issue
Moderators: GRNSHRK, ron, bfons
03/1989 E24 635csi Rough idle & warm start issue
///bm635csi
1989 E24 635CSi Highline
2003 E46 M3 SMG
2002 L322 Range Rover Vogue
1991 E34 535is
1989 E24 635CSi Highline
2003 E46 M3 SMG
2002 L322 Range Rover Vogue
1991 E34 535is