Okay, so I descreened my MAF on a stock MAF...was this just a waste of my time and risking a chunk of something going in to my engine, or should I leave it off??

I know it's a stupid question, but I am sure someone out there is wondering the same thing...

 

I bored it out and descreened it. Almost 8 years later it's never given me problems.

If you have things getting past the filter, you have WAY bigger problems than a screen can help prevent.

 

Ask your tuner what he thinks about descreening your MAF Sensor. Generally speaking its a no-no.

-Dustin-

 

Send me your screen if you are gonna toss it

 

I've descreened mine about 5yrs ago. No problems!

 

if your so worried about it i could sell you mine that ported and descreened for 40 shipped. if you don't like it...put the old one on! pm me if you want it

 

Mine was descreened by a shop without my knowledge, and I ended up with a mysterious subtle part throttle stumble that took forever to figure out. I happened across the screen in a box of leftover parts one day and installed it and it's been fine ever since! If you're not running a scan tool, you might not even know you have a problem...just because it appears normal doesn't mean it does.

It's been proven numerous times that it's NOT a restriction and all the reputable tuners recommend leaving it in. Taking it out and "feeling" a gain is urban legend in my opinion...

 

Nightmare for tuners. I think Brian had to guess on my new setup lol.

 

Thanks!

MAF was put back in. The reason I asked, was that on previous cars, it was proven to help. I did it without thinking, but then I started having these stumbling problems (you like when you learn how to drive a stick and the car lurches then lurches again.)

Thanks for the help!!

 

Are you talking about 3rd gens benefitting from descreened/ported MAFs? That's because the fin was put in there to slow the air down so it was colder, since the death valley testing had a ton of hot air or whatever. 4th gens are completely different. Leave the MAF with the fin and screen.

 

The fins were not put in the Bosch MAF sensor used in the 3rd Gens to "slow the air down". They are cooling fins, there to increase the heat transfer area, and keep the electronics from frying. You got the Death Valley part right though.

 

Mine is out, did nothing, runs exactly the same.

 

Then why not put it back in?

 

Exactly. I only noticed a very slight throttle response increase for maybe a day of driving. Then it went back to normal and I decided I should just go buy another MAF with the fins.

Injuneer: I knew it had something to do with heat and death valley Are they the same type of fins that are in 4th gens? I have never actually looked at a bosch MAF.

 

No... the two MAF's are completely different. The 3rd Gen uses a Bosch unit, single super-fine hot wire in a little circle enclosure, and about 1/2 a dozen fins sticking up from the bottom, about 1/2-way accross the open area. There is a screen on the inlet side, and another on the outlet side, and it isn't the "paper" screen like the 4th Gen GM unit. Its a heavy wire mesh. The hot wire needs to be heated to 1,000degF to keep it clean, so there is a "burnoff" period each time you shut the engine down. The output is variable voltage, rather than variable frequency. The reliability is close to "0". The Bosch MAF is a major flow obstruction, and needs both screens removed, and the fins ground down.