Forcing Closed Loop
Thread Starter
TECH Apprentice
iTrader: (1)
Joined: Oct 2003
Posts: 328
Likes: 0
From: San Diego, CA
Forcing Closed Loop Is it dangerous to force closed-loop operation from a start-up situation?
After an injector swap I get freefiring on deceleration and on shifting from cold startups until the car enters closed-loop.
I logged my commanded AFR from startup and it goes from around 9:1 to stoich following a decay rate that lasts slightly over 2 minutes. As soon as the car enters closed-loop the freefiring stops.
I tried forcing closed-loop just to see if it had any effect and sure enough the car didn't freefire at all. Obviously this isn't the solution since I don't want to start my car commanding a 14.7:1 AFR with narrowbands that aren't warmed up yet, but it is strange that it works.
Also, what forces the car into closed-loop from open-loop? I know it's more than just your ECT. Thanks!
After an injector swap I get freefiring on deceleration and on shifting from cold startups until the car enters closed-loop.
I logged my commanded AFR from startup and it goes from around 9:1 to stoich following a decay rate that lasts slightly over 2 minutes. As soon as the car enters closed-loop the freefiring stops.
I tried forcing closed-loop just to see if it had any effect and sure enough the car didn't freefire at all. Obviously this isn't the solution since I don't want to start my car commanding a 14.7:1 AFR with narrowbands that aren't warmed up yet, but it is strange that it works.
Also, what forces the car into closed-loop from open-loop? I know it's more than just your ECT. Thanks!
Thread Starter
TECH Apprentice
iTrader: (1)
Joined: Oct 2003
Posts: 328
Likes: 0
From: San Diego, CA
Originally Posted by ringram
Agreed, sort out your open loop VE and fueling instead.
You cant force closed loop when cold as O2 sensors wont work properly until hot.
You cant force closed loop when cold as O2 sensors wont work properly until hot.
