jlglr4
Full Access Member
I’m not sure about the duration (45 seconds), but 1100-1200 at startup dropping to 600-900 after a short period sounds about right to me. 2800 at start up sounds high, but I’ll try to take note of what my engine does on startup and post back.
The duration of high idle on startup I believe is based on input from a temp sensor (thinking it’s the catalyst temp sensor, but not sure). So, if the engine is running really fast at startup (2800), that probably reduces the high idle duration.
Was the PCV diaphragm you removed torn? You mentioned that replacing it brought the idle rate down, but did it fix the rough cold idle?
The duration of high idle on startup I believe is based on input from a temp sensor (thinking it’s the catalyst temp sensor, but not sure). So, if the engine is running really fast at startup (2800), that probably reduces the high idle duration.
Was the PCV diaphragm you removed torn? You mentioned that replacing it brought the idle rate down, but did it fix the rough cold idle?