No MAF L98 ?
Former Vendor
Joined: Jan 2006
Posts: 698
Likes: 0
From: Social Circle Georgia
Is there by chance a computer mounted above the battery off the firewall? It would be painted black. What about a MAP sensor mounted on the upper plenum on the passenger side of the engine? Maybe the car was converted to speed density and the simply swapped in the engine, ECM, and wiring from a 90-92 car. It would look stock then to most people.
Melting Slicks
Joined: Aug 2003
Posts: 3,403
Likes: 398
From: Lakeville MI
The MAF equipped cars can run very well without a MAF, but this usually takes some specific chip tuning.
To protect for a MAF failure, there is a default airflow calculation that approximates the MAF signal. This can work very well when properly tuned.
Did you have an SES lamp on all the time? If not, it could be that the chip's programming has been modified to disable the MAF related codes 33, 34 and 36 with the intention of running "MAFless". I've done this myself and I know of a few cars that have also used this method.
Perhaps you just got lucky and your car ran ok with the default tuning, which is certainly possible.
To protect for a MAF failure, there is a default airflow calculation that approximates the MAF signal. This can work very well when properly tuned.
Did you have an SES lamp on all the time? If not, it could be that the chip's programming has been modified to disable the MAF related codes 33, 34 and 36 with the intention of running "MAFless". I've done this myself and I know of a few cars that have also used this method.
Perhaps you just got lucky and your car ran ok with the default tuning, which is certainly possible.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
The MAF equipped cars can run very well without a MAF, but this usually takes some specific chip tuning.
To protect for a MAF failure, there is a default airflow calculation that approximates the MAF signal. This can work very well when properly tuned.
Did you have an SES lamp on all the time? If not, it could be that the chip's programming has been modified to disable the MAF related codes 33, 34 and 36 with the intention of running "MAFless". I've done this myself and I know of a few cars that have also used this method.
Perhaps you just got lucky and your car ran ok with the default tuning, which is certainly possible.
To protect for a MAF failure, there is a default airflow calculation that approximates the MAF signal. This can work very well when properly tuned.
Did you have an SES lamp on all the time? If not, it could be that the chip's programming has been modified to disable the MAF related codes 33, 34 and 36 with the intention of running "MAFless". I've done this myself and I know of a few cars that have also used this method.
Perhaps you just got lucky and your car ran ok with the default tuning, which is certainly possible.
Someone also could have repinned it to speed density (like me) since the '730 fits in the dash just as nicely as the '165 did. Unless we see some pix (or the car) who knows.
-- Joe
Thread Starter
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
But it used to look like this :
Someone put a white piece of plastic where the MAF is supposed to fit:
my mileage :
Last edited by Calderone; Feb 25, 2008 at 11:34 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
The pix are helpful - you have NO maf sir!
Now we need to figure out how. -- Joe
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Lay on your back and you will be looking right at it.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
I totally spaced - you can still run map in a '165. I forget the mask ID but it's a holden based thing. You still have to repin the ECM to run it, but a few fbody guys who didn't wanna spend the extra $75 on a '730 + memcal did it that way.
-- Joe
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
Pro
Joined: Feb 2005
Posts: 560
Likes: 0
From: Hamilton New Jersey
the right way or the wrong way? The wrong quick fix would be what the previous owner did, simply unplug the maf and put a tube in its place. The correct quick fix would be buy a maf, install it where the tube was and plug it in. These cars actually run pretty decent without a maf, the pcm simply uses a default value since it isnt receiving a signal from the maf sensor, which is why your car ran without it. Buy a new sensor and put it in. If the check engine light isn't on its probably because the previous owner took the bulb out, if that's the case replace the bulb too.
Racer
Joined: Dec 2007
Posts: 345
Likes: 0
From: Flint Michigan, #2 in unemployment, #3 in Violent crimes
I was in the turbo buick scene for a while (we brake for corvettes) and they can convert the MAF system to a non MAF setup that still learns. the guy is here in michigan that does it but I am sure you can do this with other cars and not just a grand national. the higher HP guys would delete the MAF for dependability.
it is not completley beyond the rhelm of possibilty that you can do this with nothing more than an ECU mod and correct wiring upgrades.
and my 90 IROC came factory with NO MAF, same engine, just change things out.
it is not completley beyond the rhelm of possibilty that you can do this with nothing more than an ECU mod and correct wiring upgrades.
and my 90 IROC came factory with NO MAF, same engine, just change things out.