Car is a 2g talon running ecmlink and a stock maf.

I'm having difficulties getting the isc motor in range, by setting the BISS. At my target idle of 1k RPMs, the isc position sits at about 53 and refuses to go lower. This is with the car fully warmed up (sits at 216 idling in my driveway). Idle switch and closed loop are working as they should. During the adjustment, I unscrewed the BISS and the idle shot up to 1800 RPMS. Then I waited for the isc to compensate... but nothing happened. The isc position just sat at about 53.

The coils on the isc seem fine (all tested at about 32 ohms). Also, I'm quite sure that the isc is able to move. The position fluctuates normally while driving and warming up, and the engine rpm responds accordingly.

It's almost like the ecu just doesn't care that the idle speed is too high.

Also, I know that the isc position should be about 30 for a 750 rpm idle. Should it be higher for a 1k rpm idle? Maybe that's the problem.

Thanks

The isc/idle system is an absolute pain on these cars. You may have a leak at the isc gasket so check that. It's possible that the isc does increase with idle because it may be trying to adjust the high idle. Not sure. I hate this damn idle system. Check this thread out. it has a lot of idle isc tips. http://www.dsmtuners.com/threads/the-big-book-of-random-tuning-tips.511262/#post-153641127

Good info. I'll try disconnecting the battery for a while, so that learned idle adjust isn't a factor.

So besides not meeting the expectations of the wiki. There's nothing wrong with the car....

Look I've been hated on because i idle perfectly and my isc position is 0.
Regardless of the number of variations of remedies.

I've accepted that actual results, are better than expected values.

miliman13 said:

So besides not meeting the expectations of the wiki. There's nothing wrong with the car....

Look I've been hated on because i idle perfectly and my isc position is 0.
Regardless of the number of variations of remedies.

I've accepted that actual results, are better than expected values.

Click to expand...

Your car will be blown sky-high within seconds if you aren't at 30.

What*?? ^
Lol

Haha. Vegas is at it again.

Mine is acting similarly. I have to almost max the screw out to keep it from surging. Then once I get the idle set and uncheck the boxes in link, the position or learnedidleadjust never wants to move. Coil resistance measures good.. not sure what to do.

Yeah my idle/isc has been a massive headache for me. I've been trying so hard to get it all dialed it but when I fix one thing another one screws up.

Well, with a bit of patience I got it to drop down. I adjusted the screw a little at a time, in between heat cycles. Thanks thanks to everyone for the input.

Glad you got it working! The ISC does take a while to get setup correctly and can be a real hassle sometimes but it's worth it in the long run.

With a target idle speed that high, retarding timing in the da table in the cells being used at idle and just above it will really help smooth the idle. The factory timing advances quite a bit above 750rpm and really limits the ecus fine tuning over idle speed.

Not sure if you've already done so but you're also gonna want to raise the coastingFC rpm up a few hundred so it's not trying to fuel cut on you at idle.

I had hard times to adjust my idle even with a new isc motor, until i disconnected my coolant hoses in the throttle body (my summer car since 2006) and put the fiav block off plates:

https://www.rtmracing.com/xcart/product.php?productid=18576

Idle is rock solid now! No surge or stall anymore.

91talonts1 said:

Glad you got it working! The ISC does take a while to get setup correctly and can be a real hassle sometimes but it's worth it in the long run.

With a target idle speed that high, retarding timing in the da table in the cells being used at idle and just above it will really help smooth the idle. The factory timing advances quite a bit above 750rpm and really limits the ecus fine tuning over idle speed.

Not sure if you've already done so but you're also gonna want to raise the coastingFC rpm up a few hundred so it's not trying to fuel cut on you at idle.

Click to expand...

I have already dialed back the timing at idle in the DA tables, which helped a lot. I wasn't aware of the coastingFC adjustment, though. Thanks for that!

91talonts1 said:

Glad you got it working! The ISC does take a while to get setup correctly and can be a real hassle sometimes but it's worth it in the long run.

With a target idle speed that high, retarding timing in the da table in the cells being used at idle and just above it will really help smooth the idle. The factory timing advances quite a bit above 750rpm and really limits the ecus fine tuning over idle speed.

Not sure if you've already done so but you're also gonna want to raise the coastingFC rpm up a few hundred so it's not trying to fuel cut on you at idle.

Click to expand...

What kind of idle timing numbers are you suggesting? I just looked at a log and I've got about 10-15*'s at idle

In DA tables for idle timing I have

750 rpm: 5
1000 rpm: 9
1250 rpm: 12

I reduce the cells being used at 1000 to 1750 3-5 degrees and then smooth around it.
Just play around with it and see what works for you.