Granatelli MAF question

[official_style]

i have this granatelli MAF, which i used on my truck (OBS yukon) for like 8 months. all of a sudden, it started setting a lean code constantly. is there something wrong with this sensor? i want to sell it, but i dont want to sell it if there is something wrong with it, i will send it in for warranty first. it didnt even do anything, so i am back to the stock one, and dont notice any difference. anybody know anything about these pieces of junk? i dont wanna mess up my good ebay rating! :D

[Physh1]

Could be an o2 sensor, clogging fuel filter, etc. What code did ya get exactly?....too broad to really pinpoint the source of the problem.

Cameron

[official_style]

p0174 p0171. i had the truck in the dealer, had a complete tuneup, new fuel filter, new fuel pump etc put in. also 02 sensors were done recently. as soon as i put the original MAF in and clear the code, it does not come back. i think that this granatelli MAF just went bad. it is still under warranty, so ill send it in then ebay it. i do not even want to put the granatelli back on, because i do not think it did anything at all, and have read all the bad stuff about it.

[Physh1]

Is there any debris or dirt on the sensor? That could be causing an issue but if it's clean than warranty it....

Cameron

[official_style]

yep i did a thorough cleaning with electronics cleaner spray, ok this thing is getting sent back to granatelli i am convinced.

[00silverado5.3]

Did you notice any increase in power with he MAF installed when it was functioning properly?

[airdeano]

ive noticed (especially on NBS trucks) the shifting is also affected
when using an aftermarket MAF.
just an observation
airdeano

[BC Rod and Custom]

My boss has an 01 5.3 Silvy 2wd. Mods are K&N FIPK2 and Flowmaster 40's with 2.5" pipes and Hypertech HPP3. He added a GMS MAF sensor and instantly set a code on the computer for a lean condition. The only way to fix it was to take off the sensor. Truck runs great without the MAF but runs like a dog with a broken leg when it's installed. On my colleauge's 01 5.3 Silvy 4x4 with nothign but Dual exhaust and Hypertech programmer it runs sweet with the GMS MAF sensor. The point of my post is to say that every truck is a different and may react differently to certain mods than the next truck even if it rolled off the line the same day.

[2K5Squirrel]

I installed one on the squirrel and noticed SOTP improvements. Have yet to get her on a dyno and I have yet to set a code. I called Granatelli and Hypertech a few times about install. I waited 24 hours before i re-installed the Programmer and haven't had any problems...YET. Did you disconnect both terminals when you installed? I also babied it for about 65 miles after the MAF install. If you have a Hypertech you can reset trouble codes.

[BC Rod and Custom]

We tried numerous times to fix the code and it kept coming back almost instantly. It would pop up after at least 1 or 2 miles of driving.

[2K5Squirrel]

Originally posted by z-71rocks
We tried numerous times to fix the code and it kept coming back almost instantly. It would pop up after at least 1 or 2 miles of driving.

I disconnected both terminals, hooked up new MAFS, then waited about another hour and a half before i hooked everything back up. How long did you wait before you re-connected the battery?

[bwoods1115]

Earlier this year I installed a Granatelli MAF and had the same problem come up after a 1000 mile road trip. It shouldn't be throwing a code and if it is then the MAF has lost its calibration. The warranty covers this and all you need to do is ship it out to Granatelli and they will send you a new one. I also found out that the reason my first one lost its calibration was because when I installed it I only had one terminal on my battery disconnected (you need both disconnected). Another thing they said that can make it throw a code is that you need to take it easy on the gas when you first install it so that the computer can re-learn the fuel curves and what not. I've had my second one in for about 6,000 miles and it hasn't thrown a lean code or any code for that matter.

Also forgot ... make sure you let the engine idle for about fifteen twenty minutes after you re-connected the terminals to the battery and start the engine.

[2K5Squirrel]

[i]
Also forgot ... make sure you let the engine idle for about fifteen twenty minutes after you re-connected the terminals to the battery and start the engine. [/B]


I forgot about that one. Did you let it sit for about an hour and a half before reconnecting the battery?

...And like I said baby it for about 60 miles when you first install it. I know you want to beat the hell out of her, but the computer has "relearn" Hope this helped.

Conrad

Hey Woods, are you at the Naval Academy??

[BC Rod and Custom]

Numerous attempts trying all kinds of different combination of taking off the battery cables, idling for 20 minutes after, babying for 60 miles does nothing. It sets a code in 2-3 miles of easy driving. Hell you can put it in gear and just let it idle up to speed and never touch the gas and it will still throw the code. We attributed it to all the extra air flow that the engine is getting without added fuel. We tried richening it up with a Predator Programmer to no avail so we just put it on another truck and it works great.

[2K5Squirrel]

Sorry you had the Bad-Luck bro.

Conrad

[bwoods1115]

Squirrel, yeah i'm at the academy ... you might have seen my truck around. This past weekend I spent about four and a half hours putting on some ceramic coated headers and exhaust. it sounds pretty mean