Boosted 8 Running too Rich (w/ AP)
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Boosted 8 Running too Rich (w/ AP)
My 8 is turbo-charged and the shop that did the tuning went bananas on the rich side as I mentioned it is my Daily Driver. It idles at about 12-12.5 AFR. How can I lean this out? It seems that it's running in Open Loop. What tables to I modify in the AccessTuner? I tried changing the Closed-Loop Target A Table at .13 and .15 Load from .94 to .98 and .96 to .98 (respectively). This did not seem to help. The exit for the Target A and B is set to .99 from 1000 - 4000 rpms which seems correct. Any advice or help is much appreciated.
BTW - I am getting about 12-13 mpg in this beast, lol.
BTW - I am getting about 12-13 mpg in this beast, lol.
#3
Boosted Kiwi
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you should have a stock map to compare to
check and put back to stock all settings below 30% load and 1000rpm in these tables:
Main fueling table
C/L Target A
C/L Target B
C/L exit load A , B & C
C/L exit throttle
C/L exit rpm
Also check your fuel trims at idle - a large +ve trim could indicate a vac leak
check and put back to stock all settings below 30% load and 1000rpm in these tables:
Main fueling table
C/L Target A
C/L Target B
C/L exit load A , B & C
C/L exit throttle
C/L exit rpm
Also check your fuel trims at idle - a large +ve trim could indicate a vac leak
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you should have a stock map to compare to
check and put back to stock all settings below 30% load and 1000rpm in these tables:
Main fueling table
C/L Target A
C/L Target B
C/L exit load A , B & C
C/L exit throttle
C/L exit rpm
Also check your fuel trims at idle - a large +ve trim could indicate a vac leak
check and put back to stock all settings below 30% load and 1000rpm in these tables:
Main fueling table
C/L Target A
C/L Target B
C/L exit load A , B & C
C/L exit throttle
C/L exit rpm
Also check your fuel trims at idle - a large +ve trim could indicate a vac leak
My boost gauge shows about 22-25 mmHg at idle. This is normal, right?
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I checked the LTFT while I was driving and it said 0% the whole time. I guess I remembered wrong: I am actually geting 18-20 mmHg at idle. I am not sure exactly where the boost gauge is hooked up, I forgot to check over the weekend.
#9
Are you SURE?
because that means you have a MASSIVE vacuum leak, something is up with your gauge, or some other significant problem. Engine vacuum does vary but anything less than 400 mm Hg (about 16 inches) would indicate to me problem, unless you have porting.
because that means you have a MASSIVE vacuum leak, something is up with your gauge, or some other significant problem. Engine vacuum does vary but anything less than 400 mm Hg (about 16 inches) would indicate to me problem, unless you have porting.
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I will double-check tonight, but I thought it was mmHg.
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I checked the STFT at idle over the weekend, but I can't remember what it was. I think it was actually negative. I'll run it again tonight or tomorrow and report back. I'm almost positive that I'm running in open loop and I have been screwing with the closed loop exit tables to match or get close to the stock values. It has helped, but I'm still running rich at idle. I'm tempted to post my map so somebody can give some insight. Which tables are the open-loop tables?
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I'm dumb, it was InHg, you are right.
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Here's my data log from this morning. You will see one point where I turned the air on and it ran really lean for a second before I turned in off (load goes up too). I'm not sure why the car has idling issues when the air is on since I added a grounding kit and new battery...
STFT is about -20% at idle... I don't know why I'm running in open loop, but my lambda is 1.0 for all values where RPM is 500-1500
STFT is about -20% at idle... I don't know why I'm running in open loop, but my lambda is 1.0 for all values where RPM is 500-1500
#17
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you aren't running in open loop. you are in closed loop because you have a value in your STFT. with that -20 STFT at idle you can see the ecu is trying to take out a lot of fuel.
so your values in your Air/Fuel Gear tables for idle are lambda of 1.0? What about Closed Loop A/F Target A & B tables?
so your values in your Air/Fuel Gear tables for idle are lambda of 1.0? What about Closed Loop A/F Target A & B tables?
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you aren't running in open loop. you are in closed loop because you have a value in your STFT. with that -20 STFT at idle you can see the ecu is trying to take out a lot of fuel.
so your values in your Air/Fuel Gear tables for idle are lambda of 1.0? What about Closed Loop A/F Target A & B tables?
so your values in your Air/Fuel Gear tables for idle are lambda of 1.0? What about Closed Loop A/F Target A & B tables?
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I was wondering about this as well. I know the tuner changed the scaling, but again I need to look at these values, because in the middle of the range, the values matched the stock ones. The new MAF housing is 3" where I believe the stock was 2.88"? This sound right?
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