Idle Surging help

Hey im tuning this motor and have had issues with idle surging.

Combo: 2003 lq4, 317 ported heads, 10:1 comp, tbss intake, 90 mm tb, comp camp 54-424-11 ( 212/218 @.50 .558/.563 lift 115 lsa) , shorty headerrs

I have tried all the idle tuning tricks I could find in the search feature with no luck.


Also I have set the tine to speed density to the best of my knowledge and when applying the AFR correction factors to the VE tables I noted no change in AFR. This confused me a lot.

I have attached the tune and log file with Wide band input.


Attachment 57298Attachment 57299Attachment 57298Attachment 57299

Any help would be appreciated.

You dont have your histogram set up right. Search about wideband using EGR and wideband using AC pressure sensor as well as afr error histogram, youll find a few howtos on it.

http://www.hptuners.com/forum/showth...VE-Vehicles%29

I have seen people use that EQ ratio error before, however I thought that was only used if you have the built in wide band, and not using the egr sensor like I am.

I followed this procedure https://www.youtube.com/watch?v=Ru_2...ature=youtu.be , except for the fact that i used the EGR and I dont have virtual VE (but that shouldnt matter?)

can you post your scanner config? I don't see a custom pid for the wideband, just the EGR voltage (which you still need to log). As of right now, it looks like you are just charting map vs rpm but you dont have a third value to create the AFR error chart.

Dont have my config file handy but here is maths and graph files

You aren't logging 6001, you are logging 50121. Change that out and try again. I dunno if 9.3 is correct for your wideband, but Im seeing a lot of -12,-17s in the afr error.

PID #50121 I believe was correct in the older version of VCM Scanner.

I have my scanner set up to use 6001 and am also going to use the EGR #55 blue input for 5V out of my AEM.

Quote:

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Originally Posted by 67firebird455

PID #50121 I believe was correct in the older version of VCM Scanner.

I have my scanner set up to use 6001 and am also going to use the EGR #55 blue input for 5V out of my AEM.

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Well look at his log, I see Commanded AFR NOT Commanded AFR (sensor). I was able to build maths using 50121 and looked at his afr error. He is off ~15%.

my 9.3 was for initial set up, it is closer to 10 now. Pulled the sensor out of the AEM wide band which sets it right to stoich, then modified that 9.3 till the scan read correctly. came out to 9.93 or something close to that. I am using 6001.

Quote:

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Originally Posted by welder350fd

my 9.3 was for initial set up, it is closer to 10 now. Pulled the sensor out of the AEM wide band which sets it right to stoich, then modified that 9.3 till the scan read correctly. came out to 9.93 or something close to that. I am using 6001.

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Well do this.

Make first maths the egr name it WBO2

([2811.10]/.5)+9.3 "or 9.9, 10.2 or whatever is right"

Second maths is to convert to AFR error % name it WBO2 AFR Error

100*((([2811.10]/.2)+10) -[6001])/[6001]

Make a graph like you did and use AFR Error as the parameter. Right click the graph, make sure you click your new table as it highlights the first graph in the list, set up the axis to match your VE table. Click the parameter hyperlink in the graph setup window and scroll down to Maths>User Defined. From there, choose WBO2 AFR Error. Click out at you will see the log with all the areas you hit and were off.

That will get the graph working.



To summarize, make 2 maths, 1 for the EGR and then one for the AFR error and then insert the AFR error pid in to the graph as the third parameter.

Updated my fuel injector data. Made a big difference. Now my afr are leaner and I can change them via VE table. However I am still getting a lot of surge.

Quote:

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Originally Posted by welder350fd

I followed this procedure https://www.youtube.com/watch?v=Ru_2...ature=youtu.be , except for the fact that i used the EGR and I dont have virtual VE (but that shouldnt matter?)

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Use this one.....for AC pressure but just replace it with EGR parameter....There are several more in that channel I posted for other features in 3.0 as well.

https://www.youtube.com/watch?v=Ru_2M2uGSKs

Ed M

LOL he did, he even posted the link a bit of a ways up.

Quote:

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Originally Posted by matty b

LOL he did, he even posted the link a bit of a ways up.

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Silly me.....and they are my instructional videos.....been working too hard :-)

Ed M

Quote:

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Originally Posted by welder350fd

Updated my fuel injector data. Made a big difference. Now my afr are leaner and I can change them via VE table. However I am still getting a lot of surge.

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You are gonna need to tune your Base Running Airflow which is common for cammed motors. Do a log with Long term idle trim and short term idle trim and we can see how off you are. When you log those, start it dead cold and do not touch the throttle, let it idle up to full temp and post a log. Make sure you have ECT in the log as well.

Reason I say that is the typical RAF configs dont work anymore and I noticed that myself.

Maybe Mowton will do a Youtube how-to for RAF tuning as the good how-to used a downloadable cfg to log RAF.

great, will be working on that in in a few days. away from my motor right now till late next week.