Code 34 Need a new MAF
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Code 34 Need a new MAF
Recently at the track, I missed 3rd gear on nitrous and heard a huge POP. I looked into the rear view mirror and seen a huge puff of black smoke. I just put it into 4th and coasted the rest.
I took it into the pits and looked and didn't really notice too much wrong with it then. I made a couple other runs, but the car seemed kinda sluggish. Just before I went home, I had a Check Engine Soon light. It turned out to be a Code 34, MAF sensor too low.
I am thinking that with the nitrous detonation in my intake it blew out the wires in the MAF. I have screens removed and heat sink removed.
So, I checked the purple power wire to the MAF with the car running and it has 12 V to it.
Where can I buy a new MAF for the best price?
My mod list is as follows:
383 stroker @ 9.3:1 - 9.5:1
LPE super ram plenum and super ram base
Cut air lid with K & N filter
LPE 58 mm throttle body
TNT 150 hp wet nitrous kit
FMS 30 # injectors
MSD 6AL
Ported L98 # 113 aluminum heads
NGK TR6 @ 0.038"
8 mm Taylor Spiro Pro Wires
AFPR currently set at 41 p.s.i
Centerforce Dual Friction Clutch
B & M Ripper shifter
DRM aluminum single mass flywheel
Throttle body bypass
"Frisbee" removed
Keith Black pistons
5.7" Eagle rods
Clevite 77 bearings
ARP bolts and studs
Moroso Accusump oil sump
ZF Docs C4 Beam Plates
COMP Cam 222/226 @ 0.050 0.464/0.464
lobe separation 114
intake centerline 110
Valvoline VR1 Racing Forumula 20w50
Internally balanced SCAT 383 stroker crank
Breathless Performance Air Pump Eliminator Bracket
Modified Mass Air Flow sensor with screens and heat
sink removed
2 1/2" dual exhaust all the way back, no cats, to 2
chamber Flow Masters
GSS340M Walbro 255 lph fuel pump with "hot wire" kit
from Racetronix
Ceramic coated Hooker Super Comp Headers (1 3/4"
primary to 3" collector)
I took it into the pits and looked and didn't really notice too much wrong with it then. I made a couple other runs, but the car seemed kinda sluggish. Just before I went home, I had a Check Engine Soon light. It turned out to be a Code 34, MAF sensor too low.
I am thinking that with the nitrous detonation in my intake it blew out the wires in the MAF. I have screens removed and heat sink removed.
So, I checked the purple power wire to the MAF with the car running and it has 12 V to it.
Where can I buy a new MAF for the best price?
My mod list is as follows:
383 stroker @ 9.3:1 - 9.5:1
LPE super ram plenum and super ram base
Cut air lid with K & N filter
LPE 58 mm throttle body
TNT 150 hp wet nitrous kit
FMS 30 # injectors
MSD 6AL
Ported L98 # 113 aluminum heads
NGK TR6 @ 0.038"
8 mm Taylor Spiro Pro Wires
AFPR currently set at 41 p.s.i
Centerforce Dual Friction Clutch
B & M Ripper shifter
DRM aluminum single mass flywheel
Throttle body bypass
"Frisbee" removed
Keith Black pistons
5.7" Eagle rods
Clevite 77 bearings
ARP bolts and studs
Moroso Accusump oil sump
ZF Docs C4 Beam Plates
COMP Cam 222/226 @ 0.050 0.464/0.464
lobe separation 114
intake centerline 110
Valvoline VR1 Racing Forumula 20w50
Internally balanced SCAT 383 stroker crank
Breathless Performance Air Pump Eliminator Bracket
Modified Mass Air Flow sensor with screens and heat
sink removed
2 1/2" dual exhaust all the way back, no cats, to 2
chamber Flow Masters
GSS340M Walbro 255 lph fuel pump with "hot wire" kit
from Racetronix
Ceramic coated Hooker Super Comp Headers (1 3/4"
primary to 3" collector)
Advanced
Joined: Apr 2003
Posts: 84
Likes: 0
From: Bellevue Nebraska
I bought a Wells unit for about $160.
If you do a searchfor "Vader" over on www.thirdgen.org you can find out a lot of info about this sensor.
If you do a searchfor "Vader" over on www.thirdgen.org you can find out a lot of info about this sensor.
Vader flowed a WELLS MAF (700 SCFM) as compared to stock MAF (500 SCFM).
The Wells MAF comes with only the front screen and a sensor similar to the one that the LT1s come with.
For $166 you can't go wrong so I purchased one.
I haven't had any problems with it considering I've been doing my own PROM tuning.
That's almost correct. If you place teh two units side-by-each on the bench and throw the calipers at them, the Wells unit is 3mm larger in the small direction, and about 8mm larger in the long direction (it has a little bit of elliptical shape in the housing). If you talk with the engineers at Wells, they won't tell you that it flows more at the same pressure differential, since they designed it as a direct drop-in replacement. The flow test on a bench tells otherwise. Unfortunately, the bench I used to have access to was only calibrated to 700 SCFM, and the Wells unit didn't hit the 0.1" SP at that flow level, whereas the stock Bosch unit (complete with dead hot wire) flowed to about 580 SCFM at 0.1" WC/SP. The sad part is, as you say, the ECM firmware limit is 255g/S, and tuning is the best way around that.
The Wells MAF comes with only the front screen and a sensor similar to the one that the LT1s come with.
For $166 you can't go wrong so I purchased one.
I haven't had any problems with it considering I've been doing my own PROM tuning.
However, for a few bucks more they do offer a Wells Gold and the Conrad line that are more of a premium quality. Among these parts is the SU-145 MAF. This is a direct replacement for the Bosch analog MAF on many of our cars ('86-'89) but shares many of the features of the LT1-style MAF, such as a thick film sensor instead of a hot wire, no heat sink, larger I.D. housing, and a single flat metal matrix on the inlet instead of the round wire screens as found in the Bosch units. Flow is improved and the survivability of the sensor is nearly thermonuclear-resistant. I have heard from some that the MAF does not mount well in situations where the OEM clamp had been screwed to the MAF housing, but most installations are identical to the original.
Since many have asked where to get one, the factory replied:
"We suggest contacting Neil at World Discounts @ 800-288-6728 or Chris at Ace Warehouse @ 605-342-4710 to purchase any Wells products. If they do not stock an item they will be willing to special order it and will drop ship orders directly to your business or residence."
Since many have asked where to get one, the factory replied:
"We suggest contacting Neil at World Discounts @ 800-288-6728 or Chris at Ace Warehouse @ 605-342-4710 to purchase any Wells products. If they do not stock an item they will be willing to special order it and will drop ship orders directly to your business or residence."
That's almost correct. If you place teh two units side-by-each on the bench and throw the calipers at them, the Wells unit is 3mm larger in the small direction, and about 8mm larger in the long direction (it has a little bit of elliptical shape in the housing). If you talk with the engineers at Wells, they won't tell you that it flows more at the same pressure differential, since they designed it as a direct drop-in replacement. The flow test on a bench tells otherwise. Unfortunately, the bench I used to have access to was only calibrated to 700 SCFM, and the Wells unit didn't hit the 0.1" SP at that flow level, whereas the stock Bosch unit (complete with dead hot wire) flowed to about 580 SCFM at 0.1" WC/SP. The sad part is, as you say, the ECM firmware limit is 255g/S, and tuning is the best way around that.
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Just got my mechanic to order a rebuilt one for me.
$254 CDN or $194 USD
I figure it's close enough to the other cost, I don't have to worry about bringing it across the border and paying duty and shipping fees.
I'll measure gm/sec with both screens in, both screens out and with heat sink removed. I recall getting 240+ before on a datamaster scan.
$254 CDN or $194 USD
I figure it's close enough to the other cost, I don't have to worry about bringing it across the border and paying duty and shipping fees.
I'll measure gm/sec with both screens in, both screens out and with heat sink removed. I recall getting 240+ before on a datamaster scan.
