"Idle" surge only while coasting

[kthackst]

Ok I have a 2g with DSMLink. All these issues started after switching to DSMLink. When I am coasting I have horrible RPM surge going on.

It only happens when the car is warmed up and I am coasting.

It will go from 1200 RPMs quickly to 1800 RPMs and drop back to 1200 and repeat but only when coasting. The moment I come to a complete stop then it will eventually settle down to 950 RPMs. I checked for boost leaks and found nothing. Attached are the logs. The log shows RPMs creep up it hit about 1800 RPMs then kick into open loop for a split second shut off the injectors then drop back into closed loop. Repeat until I come to a stop.

Any ideas? Thanks in advance.

 

[ramsack]

I don't know how to read logs (program-wise), but does your O₂ signal cycle when this is acting up?

 

[kthackst]

I do have the narrowband simulation turned on in ECMLink and it appears to be pegged at .2V until it hits the high RPMs... I have the switch over voltage right at 14.7afr.

 

[ramsack]

There ya go. It should be cycling.

 

[kthackst]

Now the question is how to get that thing to cycle faster?

 

[ramsack]

It should bounce between the lowest and highest voltages a few times per second. Are there any settings in DSMLink to ignore O₂ readings to determine idle mixture during coasting?

 

[drzdude]

So your not using the front O2 and your using the rear with a wideband using the narrowband simulator?

 

[92AWDHX40]

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


idle surge at anytime read above thread lots of good information regarding surge.