I disconnected the battery then gently cleaned the CEM pins with a very small nylon brush after spraying with contact cleaner, left overnight to dry then reconnected everything.
The terminal pins and sockets looked spotless before I did this with no sign of corrosive product but cleaned anyway.
Car starts OK. Idles briefly at 2000rpm then drops to usual 1000ish
Check engine light is on while engine running. Will it generally do that for a while after cem has been disconnected until it recalibrates?
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