ECMlink Can't figure out the idle.

[Nitrobasher]

Hey people,

So the low down on the car is a 91 GVR4
1050cc injectors
Fuel lab AFPR (37psi)
Link v3
Gm Maf with link cable
LC1 wideband logged as nbo2
New bpr7es
Most vaccum is deleted other than wastegate, bov, fpr, and boost gauge.

I've done several boost leak test and found only the lower injector seals to be leaking, which have since been replaced.

I've done a hard reset on Link multiple times to correct any errors I may have made to the system to make it act like this.

Car will start hard, idle at 2400 rpms for 10-15 seconds then drop and fluctuate between 900-1500 rpms.

I've read most all of the idle tuning how tos and instructions. I would just like some verification that there is nothing wrong with the tune as of right now. So I'm hoping someone with some experience could take a quick look at my log just to verify its where it should be and not the cause of poor idle.

Thanks, and any info is appreciated

 

[stroh]

Your throttle position and TPS volts seem to be moving around a lot when the car was off and when it was running. You might want to see if it is functioning properly.

 

[rnitto]

I have this problem too when I installed the ISC & FIAV. From what I hear the idle surge is usually a bad/misadjusted ISC or BISS or bad FIAV. Throttle cable can also do it. Make sure your TPS Volts are .63 at idle and check that the ISC position is as close to 30 at idle too.

http://www.dsmtuners.com/forums/articles-engine-fuel/191137-how-fix-your-idle-surge-problem.html

 

[Tyeler18]

The big thing I'm noticing is your o2 isn't cycling at all. As soon as it was ready to go into closed loop it just dead locks at .8v. With narrowband simulation it should just constantly cycle between .2 and .8v. It's causing it to jump in and out of closed loop non stop. Something's not setup properly with that.

 

[Geier]

Timing is going crazy, up to 30*. Have you set the base timing to 5*BTDC?

MAFRaw is also showing 770Hz!!! This should be at around 50Hz at idle. I would say something is up with the GM MAF you are using.