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PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

afr issue

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Old Jan 13, 2014 | 11:10 AM
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Default afr issue
So I have a cam only trex cam 01 m6 trans am, me and my buddy tuned the car and every adjustment we do for the afr at idle doesn't do anything it stays at 11.8-12.5 what could be causing this issue and info would be greatly appreciated. Maybe leaky injectors? I'm just tired of going through plugs searching for the problem thanks
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Old Jan 13, 2014 | 12:36 PM
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How exactly are you trying to add fuel at idle?
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Old Jan 13, 2014 | 12:44 PM
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Not trying to add trying to lean it out but it wont
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Old Jan 13, 2014 | 01:43 PM
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have you tried going odsd and working the ve tables?
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Old Jan 13, 2014 | 03:13 PM
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Post. Dat. Toon
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Old Jan 13, 2014 | 04:30 PM
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What is odsd? Speed density?
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Old Jan 13, 2014 | 05:43 PM
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Originally Posted by cory123456
What is odsd? Speed density?
To the typing impaired it is: Open Loop, Speed Density.
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Old Jan 13, 2014 | 06:23 PM
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No I haven't my buddy hasn't really done any sd tunes but maybe when he gets back in town we'll try it out.
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Old Jan 13, 2014 | 06:30 PM
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Did you swap out injectors?
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Old Jan 13, 2014 | 06:58 PM
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Haven't yet don't have any other stock injectors to try out
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Old Jan 13, 2014 | 07:01 PM
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Do yourself a favor and don't let him tune it. Take it to a pro.
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Old Jan 13, 2014 | 07:03 PM
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Tune the VE table first , then head to the MAF table. But if he can't figure out the idle , I see a toasted piston in the future.
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Old Jan 13, 2014 | 07:29 PM
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We did that and nothing changed
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Old Jan 13, 2014 | 08:07 PM
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Originally Posted by danieloneil01
Do yourself a favor and don't let him tune it. Take it to a pro.
X2! That one should not be that hard. Pretty straight forward.
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Old Jan 13, 2014 | 08:44 PM
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He knows what he's doing, the car isn't responding to the adjustments we do the tune everywhere else is fine besides the idle keeps going rich
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Old Jan 13, 2014 | 09:30 PM
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Shorten the injector pulse width, the car leans down. No way around it.
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Old Jan 14, 2014 | 08:36 AM
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sorry about the typing impared post about the speed density and open loop was at work on my phone and just shot out a quick reply. Thansk Ed for letting him know what i meant.
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Old Jan 14, 2014 | 11:38 AM
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Ya I'd like to figure out the issue, before I had my buddy tune it I sent it to frost for a mail order and it drove horrible after he tuned it so I had a professional tune it prior to my friend messing with it.
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Old Jan 14, 2014 | 11:44 AM
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And yes I understand a mail order tune can't be dead on
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Old Jan 14, 2014 | 03:35 PM
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Can you post a log of this? Have u checked your commanded afr during this? I'm not a pro and just tune my stuff but when I tune like you are doing I always go open loop speed density then back to maf if that's what I'm going to run. If you do this it will do what you want. You also need to look at your 've error. Again post a log and your tune file.
Last edited by tempoffroad; Jan 14, 2014 at 03:45 PM.
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