Bad gas mileage...90mmMAF

SVT98SNAKE · Aug 14, 2008

Ive been getting about 13 or 14 mpg highway and dont know why. The only code its throwing is IMRC stuck closed. I was told that the 90mm MAF may be the problem, bc I dont think that the car has a tune. Could I be running too rich bc of the larger MAF?

Thanks

OnyxCobra · Aug 15, 2008

what brand MAF? do you know what if anything it's calibrated for?

SVT98SNAKE · Aug 20, 2008

thats what sucks...I really have no idea what its calibrated for...but looks like I have bigger problems. My motor is ticking/nocking. Not really sure what exactly is wrong with it yet, but def not driving it

timpryor · Aug 21, 2008

Why do you have a 90mm MAF? are you blown? if not you really don't need the 90mm

OnyxCobra · Aug 21, 2008

timpryor said:
Why do you have a 90mm MAF? are you blown? if not you really don't need the 90mm

I have a 90mm LMAF and it works great n/a as well as blown. The nice things about the LMAF is it's cheap, extremely accurate and reliable, but I think most cars need a tune to use it.

ju015dd · Aug 23, 2008

you need a tune to run a 90lmaf, it is set up to run bigger injectors so you are dumping lots of fuel.

Goindeafonmtx · Aug 27, 2008

Why do you have a LMAF on the car? You said its not blown. If you are not pegging the stocker, you don't need a bigger one. Don't even have it tuned for it, its a waste of money because you can put a stocker in there and everything will go back to normal. And simply putting bigger injectors on is only going to make things worse. MAFs are not calibrated for anything injectors. The computer is tuned for the maf's voltage output and the injectors duty cycle. That is maybe how it worked in the Fox cars, but not in the SN95 cars.

NERD · Sep 8, 2008

Yeah, running a 90MAF with out having it tuned is like running WOT and cutting fuel. might not be some dramatic as that but certainly not good.

mellor_21 · Sep 11, 2008

yup thats a lot of air bud lol prolly more than your injectors can handle.. which means your prolly burnin lean.. which is very very bad.. which is prolly where your knock is comin from.. i hope you can work it out without bustin into your engine

SVT98SNAKE · Dec 11, 2008

thanks for all the info guys! Funny story...the motor went about a month ago

definitely going back with a stock MAF for now :icon_rr:

reduceallpain · Dec 13, 2008

dude that sucks..sorry to hear.. weren't you trying to sell the cobra?

SVT98SNAKE · Dec 14, 2008

haha yeah I was...damn the luck huh. I guess I'll be keeping it now that I sunk $3000 into a new stock rebuilt motor. Plus whatever the labor is to r and r it. First thing I'm doing is putting a stock maf back on it and getting it tuned