why is my maf so irratic at wot in boost? do i have a leak or is my maf funky? i tried turning the maf and it did nothing. here are a few logs. i did find that my 2,6,8. injectors were leaking underboost and actually blowing out fuel. bu i think i fixed that. i'm going to go pressurize my plumbing and intake again and see (err listen) for more leaks.

 

i tried this in the tunning section but no hits. can anyone post some logs of turbo maf cars? my maf is extremely irratic at wot and i can't figure out why. i don't know if it is the maf or a leak or what.

in the logs it's rich but still KR at only 16*

 

i rotated the maf and here are some more logs.

 

I know absolutely nothing about tuning. Mine sometimes does the same thing but I am still on the oringinal STS tune. I have put in an order for some things that will help my truck cam tranny converter and meth kit but with that I'm taking it to a dyno and letting them go over the whole set up and tune it the way it needs to be. I have found that my truck runs a lot better and faster and 3 qtr throttle from the dig then after I hit boost floor it and it doesn't do that. I can't explain that but who knows. I hope this helps a little. GOOD LUCK

 

second scan...frame 727 to 779. Some thing is wrong for your knock sensors to want to knock under those conditions IMO. Your timing is pretty low...hmmm...post up your tune as well.

That maf is definitely not happy in WOT. LOL it's a tad erratic as you say. What's weird is usually when you have a crazy maf like that some other sensor follows the results. Like your afr should bounce with it. Post your tune!

btw, sorry...you have been moved back to tuning also. Hopefully we can get ya some activity in there this time.

 

i'll post my tune soon as i get home. i would love to figure this out. the maf is right after a bend, hint the reason i tried to rotate it. i tried to move it to a more straight line but it won't go anywhere but there.

 

Update on the injector leaks. I pressurized the intake again. This time with soap and water, I found my entire driver side was leaking just a bit. So I made new spacers for those and expanded the holes a little more. Tightened them all back down and poured more soapy water on them this time no bubbles. I’m going to warm up the truck later this week and check it at operating temp to make sure all is good. But the only sound of air moving I could hear after this was air in the manifold. Compressor gauge read 12psi and boost gauge read 10psi. I figure pressure drop and all that was probably good.

 

I'd look at it but I don't have HPTuners

What value is the MAF bouncing around at? Can someone post a screenshot?

 

i can post a screen shot tonight. i'm at work so i can't get to any of the logs. but its around 45-60lbs.

 

We're talking airflow right? You mean lbs/hr?