help ? afr rich when crusing and bucking. tunerpro

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Commylife
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Commylife »

alright guys i havent acctually changed any of the fuel map, ive only done basics.
i am using both 02 sensors. as for fuel im running a raceworks in-tank pump with 1-1 saas fuel pressure reg. pressure is sitting at 45psi
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Charlescrown »

You really need to post a log. Those A/F ratio's on cruise are way way to high. I would think with those figures if you stomp on the throttle it would cut out.
Commylife
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Commylife »

it dosent just stall, at wot it is around 11.4 - 12.1
immortality
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by immortality »

Charlescrown wrote:I doubt it can go into closed loop with those pig rich figures. Get back to basics and check your fuel pressure before trying to tune it.
It comes back to checking the reliability of those numbers during cruise.
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Charlescrown »

I agree theres something screwed up with those wideband figures.
Commylife
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Commylife »

what do you guys recomend i do
immortality
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by immortality »

Ignore the WB O2 sensor for a moment and see what the PCM is doing. Check a log, when driving around what is the target AFR? If you haven't changed anything in the tune other than manual trans setting and lean cruise the car should still behave as a stock car.
Commylife
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by Commylife »

alright dude i will deffinetley do that, i will add that its done it since i built the turbo kit. i just didnt notice it that bad untill i recently drove it 350kms
it seems happy underload, only carrys on under light throttle and will rev hunt when i stop, sometimes it will sort its self out but often it will stall.
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by immortality »

Moved any sensors?
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Re: help ? afr rich when crusing and bucking. tunerpro

Post by antus »

do you know how to log? can you save a log and post it? I suspect something is way out for reasons we dont yet understand, and at basics I reckon your fuel trims will show your a long way from what your tune is doing. At most basic your measuring air, and its infecting fuel to suit the air. So either your air measurements are out, or your fuel injection is delivering fuel thats way out from whats expected from your injector times (so flow or pressure). Wideband can help you figure this out, but you need to trust the wideband numbers first and consider what you've changed other than turbo from stock, and how that can affect things. Wideband can be affected from where it gets its power and if there is any unintended resistance from poor connections on the wideband. So, this is why you need to use the calibration stages at startup to verify if the wideband data is good in your logs before you go further. To do this read the wideband manual and use the logs to see if you have a problem there or not first.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
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