open loop idle issue
Thread Starter
Staging Lane
Joined: Jan 2004
Posts: 87
Likes: 0
From: Anchorage Alaska
open loop idle issue During initail start hot or cold my idle is extremely low and won't idle without a little throttle input. This only lasts untill it goes closed loop and then it idles well. Using efi live but still a novise tuner, ltfts are perfect at average -1.5 to -2 afr is 12.5 accross the board. Any one have suggestions on how to get my open loop idle stabalized. Thanks in advanced
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
what's your target Idle speed?
Also are the LTRIMs all -1.5 to -2 at idle? how much timing are you seeing at idle? (on cold start w/coolant low there's an ECT timing table, it pulls alot of timing, I've found removing some of this retard has helped idle)
There's also an open loop AFR table, you could try leaning it out at idle RPMs
Also are the LTRIMs all -1.5 to -2 at idle? how much timing are you seeing at idle? (on cold start w/coolant low there's an ECT timing table, it pulls alot of timing, I've found removing some of this retard has helped idle)
There's also an open loop AFR table, you could try leaning it out at idle RPMs
Thread Starter
Staging Lane
Joined: Jan 2004
Posts: 87
Likes: 0
From: Anchorage Alaska
idle speed set at 1050 when cold, ltfts at -7-6 after it goes closed loop, open loop dle afr parameter set at 1.00 commanded afr is 14.63 . will try to bump up idle speed when cold first and see what happens. appreciate the help. Is the 15.5 afr at idle closed loop to lean?
Thread Starter
Staging Lane
Joined: Jan 2004
Posts: 87
Likes: 0
From: Anchorage Alaska
Found my issue with idle. Just needed to adjust the set screw on the 80mm tb, didn't notice there is no hole at all in it. Adjusted it up 4% and reset the tps. Idles perfect, thanks for the input. 
but as the other mentioned open loop FA, VE, and timing all have an effect in idle. 
