Black Bear Tune nearly done...

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TheFuzz

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...but with some issues. My MAF sensor is reading low, and neither me nor Justin can figure out why. It's not the sensor itself, I just replaced it due to this issue and the truck is STILL not pulling enough air for some reason. I have gone over the intake tube with a fine-tooth comb, and there are no cracks, no dents, no damage...hell, not even very many scratches. I cleaned all of the mating surfaces, the worm clamps, the rubber connectors, everything...and got a ton of crud off of them. I thought for a second that maybe the glue holding the rear of the accordian-shaped rubber connector on the tube might have a leak, so I cleaned it up and put a bead of RVT silicone around it to make sure it was sealed. Still, no dice. The reading is more stable since I've replaced the MAF, but it's still reading lower than it should.

Justin is compensating for the problem with the tune, but I HATE having an unsolved issue that has to be corrected with software, rather than fixing the issue itself. It's not the intake manfold gasket, I specifically asked. I honestly don't know what else could be wrong. I guess I will just have to use this as an excuse to get an aftermarket intake system. :D

Funny thing is, my truck usually gets DISMAL gas mileage. Like, 13.5 mpg average. After the first couple of datalogging runs I did ( I've done a total of five becuase of this frappin problem with the MAF), I was down to 12.5 average. Then, I cleaned up the intake and did all of that stuff, and even after two more datalogging runs in the mountains, my truck has jumped to 15.6mpg average as of my fill up today! Obviously I fixed SOME sort of intake leak, but the MAF is still off? What gives?
 
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Shaggy

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I like Justin!! :rocking:
 
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TheFuzz

TheFuzz

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Heh, I have a feeling that I'll like him a whole lot more once the new PCM is in the mail. It's going out tomorrow, so next week is party time. :party33:
 

Shaggy

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Heh, I have a feeling that I'll like him a whole lot more once the new PCM is in the mail. It's going out tomorrow, so next week is party time. :party33:

Thats always a good reason on liking someone, when they get you something for free :Handshake:
 
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TheFuzz

TheFuzz

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I don't think its free. I believe he did the scan cable tune.

Correct. I've got about $600 ($350 of which is refundable equipment deposits) plus two tanks of gas wrapped up in this tune so far, but I sincerely hope that the end result is worth it. From everything I've gathered on Tahoeforum, it will be. I'm very, very excited...even with my MAF sensor being retarded.
 

Shaggy

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Correct. I've got about $600 ($350 of which is refundable equipment deposits) plus two tanks of gas wrapped up in this tune so far, but I sincerely hope that the end result is worth it. From everything I've gathered on Tahoeforum, it will be. I'm very, very excited...even with my MAF sensor being retarded.

I now the tune wasn't free, I thought he was sending you something that was free, read it wrong :Boo:
 

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Hopefully you will get the problem fixed. Keep us updated though. The black bear tune is great though! You will enjoy it!
 
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TheFuzz

TheFuzz

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Yeah, I think that fixing the actual problem isn't going to happen at this point...Justin and I are both at a total loss as to what could be causing the MAF sensor to read the way it has been. So, he'll tune around it and all should be well in Yukeland, lol. He said that the new PCM will probably go out today, so hopefully I'll have it installed by the end of next week. I need to burn through the current tank of 85 and refill with 91 beforehand though.
 

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