97 Acura Integra Gsr will have a lean idle after warm startups Afr reads around 16-17. At cold start ups it will idle at 14-15 AFR which IMO is still a little lean for a cold start up. It is said that a warm idle should be around 14.7 AFR Not when cold. Just looking for some inputs. My car is currently running on a Neptune RTP board with an lc-1 Innovate Wideband. Besides that everything is fine while crusing also the car will idle nicely in the 14 AFR range when warm. Any inputs are appreciated. Thanks in advance.

 

What do your IAT and ECT fuel corrections look like?

If you haven't changed any of them and your sensors are all in proper working order. I would say your idle fuel setup may need some fine tuning.

How did you tune your idle? Is your timing synchronized with Neptune.

I like to tune idle with the engine up to operating temps (180-195°F), timing locked @ base (example 16°) and my IACV disabled (550±50 rpm) That way I know everything is where it should be before I start adjusting anything. Base timing and idle ranges differ from vehicle to vehicle, check vehicle manual for specific numbers.

 

I tuned my idle by adding and subtracting fuel on my map. My Iats are around 135 degrees Farenheit at at warm startup. All my sensors work fine from what I can tell no CEL or error codes on Neptune. I tried adding more fuel to my Iats at low load in the 130 degree range but same ****. So I tried bumping up my fuel on my map just to see if it would make a difference but no difference. Again everything is only changed when the car is at normal operating temps. Once it sits for a bit then the idle will jump back to normal but right off the startup it will stay lean and cause the car to die.

http://www.youtube.com/watch?v=n2KVTR8Glvc

 

Plus another thing is my timing will sit at 17degrees according to Neptune. I re timed it with a timing gun to 16 degrees but maybe im off 1 degree from moving the distributor?

 

Iv never used neptune but all should still be the same. U need to let the program know when u set the ignition timing (synchronized as stated above). U have air and water temp correction tables that will add or subtract fuel according to the temp sensors and it will b running as a percentage of the fuel map. Do u have closed loop engaged? if so u need to place it in open loop when making changes. Mayb u have some sort of autotune enabled or closed loop with the wideband.

 

Hmm not sure about that one but ill look into it. I changed my base timing on Neptune to 17 degrees to see if it will make a difference. If it does I will re time it with my timing gun and make sure its dead on 16 degrees. Im not sure how advancing the timing 1 degree would affect it.

 

not sure about what? One degree of timing at idle has nothing to do with the afrs. If u ask me, I think as long as ur cars starting then its all good, if itl start with less gas then thats a good thing.

 

Not sure about this:
Do u have closed loop engaged? if so u need to place it in open loop when making changes. Mayb u have some sort of autotune enabled or closed loop with the wideband.


And yea it starts but majority of the time it will stall out. Pretty much fuel cut that is happening.