Quote:
Originally Posted by Laird Scooby
Noone? Nobody? Nowhere?
Speedometer signal. Vehicle speed signal from the speedometer. Used to adjust idling speed during engine braking and for constant idle speed compensation.
Copy/pasted from :
https://ipdown.net/wiki/index.php?title=LH_2.4_Jetronic
It's the correct reason too. What isn't mentioned is that all that helps with emissions and helps prevent unburned fuel entering the cat which can overheat and/or poison the cat. |
Yes, but its keeps it slightly high from cold until you stop, even if you don't stop for 30 minutes after it is warmed up. After that the idle during braking isn't any different to stopped (normally one should have the engine engaged although for Hypermiling I coast alot), maybe its more relevant for automatics. Idle is detected during throttle closed switch, it doesn't need the speed sensor for that.