there may be other mafs that fit but have different calibrations. if you've already tuned to the fbody maf thats what you should get. the bbody maf has a different calibration too.
there may be other mafs that fit but have different calibrations. if you've already tuned to the fbody maf thats what you should get. the bbody maf has a different calibration too.
Interesting. At Rock Auto they show cross reference to other vehicles that share the F body MAF part number and you are correct, the B body LT1 cars are not included in that list. But interestingly, Vortec, LT1 and LS engine equipped cars and trucks are included under the same part number. So, the MAF we just bought came from a 2001 GMC Savana van and its compatible with the 1994 Z28. Heres the listing at Rock Auto and if you click on the part # 2133457 on the AC Delco line you'll see the cross reference vehicles.Originally Posted by steveo
Even more interesting is this. We just went and got the used MAF before we took the suspected bad one out of the wagon. Low and behold we discovered the screen had caved in and shorted the sensor. Pulled the screen out and the thing fires up and runs like it should. So now I have a spare MAF which is just fine.
On the screen idea, I now have a screenedMAF and an unscreened MAF. Is there any benefit in running unscreened in my application? The only mods on this LT1 are 1.6 roller rockers, 52mm TB and long tube headers.
Here's the pic of the caved in screen. Damn I should have just checked that initially on the side of the road. Could have just driven home.
John - '79 Malibu Wagon - LT1 - 4L60E
just because a chinese knock off universal maf sensor says it works with 100 different vehicles, because their only qualifier is that it fits/starts/runs doesn't mean that all 100 vehicles actually have the same maf sensor with the same calibration curves.But interestingly, Vortec, LT1 and LS engine equipped cars and trucks are included under the same part number.
rockauto is great for finding cheap parts but not necessarily the right way to ensure fitment of a critical sensor like a maf. they run cross reference chains to universal fit stuff and back in both directions to ensure the greatest amount of bottom-of-the-barrel cheap parts show up in the list.
a vortec or LS1 maf is definitely not the same with regards to airflow vs hz output and if this is a car you're actually tuning you need to totally recalibrate to that new maf
no, but again, will throw off your calibration a bit. we've always figured that screen is probably there to reduce turbulance for more accurate readings (which doesn't make a huge difference in reality, but make sense from a design standpoint) and to stop crumbling peices of that air filter you haven't changed in 200,000 miles from ending up destroying your maf wiresIs there any benefit in running unscreened in my application?
Okay stevo thanks.
Actually it didn’t like the Savana MAF. It made the pcm add too much fuel and made it way rich. So I put the Camaro MAF back in without the screen. It didn’t like that either. Ran out of time for the moment but later I will remove the screen from the Savanna MAF and put it on the Camaro MAF. Then I’ll have the proper MAF with a good screen. I’ll post back if that finally fixes it.
John - '79 Malibu Wagon - LT1 - 4L60E
it's' totally possible the fbody maf was damaged beyond repair when the screen contacted the wires. they're really sensitive. you could totally use the wrecker maf if you wanted to just recalibrate your maf table for it. you should also datalog and see what kind of AFGS you're getting when trying these maf sensors out. if you have an old datalog, you could easily compare aganist known good maf calibrations (you should get similar airflow for a particular MAP x RPM from a 'known good' log)
oh another thing you might not realize is that if you've been driving around without a maf, and you plug one back in, your BLMs are probably now trimming for your VE table and will take a bit to catch up and trim for MAF instead. it might be good to clear your BLMs when reconnecting the maf, before starting the car.
Back in business! Put the screen from the Savanna maf on to the Camaro maf and put it back on the car. Cleared the blm and drove it around for 30 mins running it through all the various driving conditions. In the beginning of the drive it was still acting up a bit but it gradually got better. It's now back to happy and running great. The camaro maf survived and it wasnt a waste getting the maf from the Savanna since we needed the screen anyway.
John - '79 Malibu Wagon - LT1 - 4L60E
……..and I’ll keep the sensor portion of the Savanna MAF with consideration towards fiddling with its calibration. It’s good to know that’s possible. Thanks for the info Steveo
John - '79 Malibu Wagon - LT1 - 4L60E
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