Custom tunes+ CAI = Lean??? Help

AZFXFOUR · #1 Wed, April 21st, 2010, 02:18 PM

So I got my Gryphon last week and finally got around to putting on my CAI so I could run my custom tunes. After going for a test drive I checked my DTCs it was still showing a lean condition. My truck is an 04. I thought the whole reason for getting the custom tunes was to fix this lean condition when running my CAI?? I drove the truck around for about ten minutes and this lean DTC showed up about 4 times. On another note im not sure about the shift strategy that Bill set me up with, I really liked the trans only edge setting that I had before. Now it seems that my if I get on my truck hard it falls on its face after every shift.

***Power Hungry*** · #2 Wed, April 21st, 2010, 02:37 PM

Kyle,

First thing... please double check that the MAF sensor is not installed backwards. The arrow should be pointing in the direction of the airflow, towards the throttle body. I just ask because it can cause the symptoms you've described. Also check and make sure the are no air leaks in the tubing/boots as this can cause erratic MAF readings and a subsequent lean condition.

If that's all good, then I can make some minor changes to the MAF structure to help resolve the lean condition. It's just unusual as the changes we've made should be working just fine.

As to the shifting, if the MAF sensor is not reading correctly, the load calculations will be inaccurate and this will severely affect shifting. Again, if the intake setup looks cool, we can make some adjustments to correct the shifting.

Thanks.

AZFXFOUR · #3 Wed, April 21st, 2010, 02:45 PM

Bill,

I can triple check the MAF sensor but Im 99.9% sure its correct as I double checked it when I put it in. I did drive it to work last night (24miles round trip) with out any lean DTCs but I just drove it normally and tried not to get on it. Is there a chance that because it was the first time I drove it with the new tunes and intake that it just needed some time to adjust everything? I will drive it to work again tonight and see if I can get it to come back again. Other than that issue and the shifting im happy with everything so far. Got 17mpg on the way home last night

I know your extremely busy and I dont want to seem ungrateful but if you could adjust the shifts that would be gr8! Thanks

***Power Hungry*** · #4 Wed, April 21st, 2010, 02:56 PM

I'll go another 1.5-2% on the MAF and change the shifting a touch. That should get you straight.

I'll hit you back when it's ready.

AZFXFOUR · #5 Wed, April 21st, 2010, 02:57 PM

Thanks Bill. I havent had a chance to try my tow tune think its the same deal?

***Power Hungry*** · #6 Wed, April 21st, 2010, 03:35 PM

Quite possible. The tow tune should be less of a problem because they are already a light bit richer in the tuning. You could certainly give it a spin and see if it responds better.

AZFXFOUR · #7 Wed, April 21st, 2010, 04:14 PM

Ok I will check it out. Thanks again

AZFXFOUR · #8 Thu, April 22nd, 2010, 11:50 AM

OK so I drove to work yesterday with the perf. tune still loaded and tried to induce a lean DTC and never got one. Then before I left work last night I loaded the tow tune for the drive home. I was able to induce a lean (bank 1 and 2) DTC with the tow tune loaded. I have to say though, I was much happier with the feel and performance of the Tow tune! It was exactly what I would expect a tow tune to feel like and gave the throttle response that I was hoping to find in the Perf. tune. I could hold my foot in the throttle through the shifts and it never lagged, as opposed to the Perf tune where the power drops out after shifting. I hope this helps explain it for you Bill. I will say that It seems that the lean DTCs only show up if im doing a real hard accel. from a stop or when going very slow (less than 10mph)

AZFXFOUR · #9 Sun, April 25th, 2010, 03:12 PM

Just wondering what the status on this issue is?