Fuel consumption for MAF testing is high? - BMW M5 Forum and M6 Forums
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post #1 of 8 Old 18th April 2008, 10:04 PM Thread Starter
bugzy
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Fuel consumption for MAF testing is high?

I'm hitting 160L per hour using the information on this thread, https://www.m5board.com/vbulletin/showthread.php?t=54788


i assume im running rich since the FAQ says 140L per hour is what should be normal

.: 2005.5 Audi S4 Avant 6spd manual
Stasis coilovers, Milltek cat, Milltek downpipes, Milltek resonated exhaust
. :2000 Jetta 1.8t - Daily

Old::
.: 2000 BMW M5 ::
HRE C21 19x8.5 and 19x10, Toyo Proxes T1R 255/35/19 (f) 285/30/19 (r), Bilstein PSS9 coilovers, Britalman X-pipe and Exhaust system, Britalman intake system, Exotics Tuning carbon fiber front lip, Range Rover 16:9 Nav screen, Dice ipod adapter, Ecode Angel eyes Xenon, LED rear tail update, black vinyl roof

2002 Audi A4 Avant
19x8.5 BBS RS-GT, Toyo T1R 245/35/19, GT27RS turbo kit, Revo software, Sportec front and sideskirts, S4 rear bumper, custom exhaust, Topspin Design sport seats, H-Sport S4 swaybars, AWE boost gauge

1999 GTI VR6, 1989 GTI 16V, 1994 Volvo 850 Turbowagon

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post #2 of 8 Old 18th April 2008, 10:18 PM
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Quote:
Originally Posted by bugzy View Post
I'm hitting 160L per hour using the information on this thread, https://www.m5board.com/vbulletin/showthread.php?t=54788


i assume im running rich since the FAQ says 140L per hour is what should be normal
No, that is just considered the minimum acceptable flow. 160 is excellent!
Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......
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post #3 of 8 Old 18th April 2008, 10:24 PM Thread Starter
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but im having hesitation issues

and i got check engine light with MAF code and bank 1 and 2 are running rich codes

.: 2005.5 Audi S4 Avant 6spd manual
Stasis coilovers, Milltek cat, Milltek downpipes, Milltek resonated exhaust
. :2000 Jetta 1.8t - Daily

Old::
.: 2000 BMW M5 ::
HRE C21 19x8.5 and 19x10, Toyo Proxes T1R 255/35/19 (f) 285/30/19 (r), Bilstein PSS9 coilovers, Britalman X-pipe and Exhaust system, Britalman intake system, Exotics Tuning carbon fiber front lip, Range Rover 16:9 Nav screen, Dice ipod adapter, Ecode Angel eyes Xenon, LED rear tail update, black vinyl roof

2002 Audi A4 Avant
19x8.5 BBS RS-GT, Toyo T1R 245/35/19, GT27RS turbo kit, Revo software, Sportec front and sideskirts, S4 rear bumper, custom exhaust, Topspin Design sport seats, H-Sport S4 swaybars, AWE boost gauge

1999 GTI VR6, 1989 GTI 16V, 1994 Volvo 850 Turbowagon

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post #4 of 8 Old 18th April 2008, 11:16 PM
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Quote:
Originally Posted by bugzy View Post
but im having hesitation issues

and i got check engine light with MAF code and bank 1 and 2 are running rich codes
Perhaps there are problems, but based on your flow numbers, it does not point to MAF's. However, they are cheap enough to replace, less than $200 a pair. Worst case is you have a spare set for when you really do need to replace.

MAF failures do not usually cause running rich, usually bad MAF's result in not enough fuel, so if anything, I would expect lean. However, if you have an air leak after the MAF's then you will run rich as all the air the MAF "sees" is not getting to the engine. Check the plumbing from the MAF housings back to the plenum, including the little gasket where the tubes go into the plenum housing.

Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......
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post #5 of 8 Old 19th April 2008, 12:12 AM
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post #6 of 8 Old 19th April 2008, 01:26 AM Thread Starter
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i havent replaced my o2 or cat's yet

.: 2005.5 Audi S4 Avant 6spd manual
Stasis coilovers, Milltek cat, Milltek downpipes, Milltek resonated exhaust
. :2000 Jetta 1.8t - Daily

Old::
.: 2000 BMW M5 ::
HRE C21 19x8.5 and 19x10, Toyo Proxes T1R 255/35/19 (f) 285/30/19 (r), Bilstein PSS9 coilovers, Britalman X-pipe and Exhaust system, Britalman intake system, Exotics Tuning carbon fiber front lip, Range Rover 16:9 Nav screen, Dice ipod adapter, Ecode Angel eyes Xenon, LED rear tail update, black vinyl roof

2002 Audi A4 Avant
19x8.5 BBS RS-GT, Toyo T1R 245/35/19, GT27RS turbo kit, Revo software, Sportec front and sideskirts, S4 rear bumper, custom exhaust, Topspin Design sport seats, H-Sport S4 swaybars, AWE boost gauge

1999 GTI VR6, 1989 GTI 16V, 1994 Volvo 850 Turbowagon

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post #7 of 8 Old 19th April 2008, 02:52 AM
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I thought you needed to? That'd be my thought as to why you are running rich. If the O2's or Cat's aren't working correctly then you'd run rich. And if your Cat's are bad then something else went bad that you need to fix as well. Cat's don't go bad for no reason under 500k.
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post #8 of 8 Old 24th April 2008, 02:01 AM Thread Starter
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Well got my SES cleared last week, and cars been running beautifully so far

new spark plugs, new MAFS, coolant temp sensor ...

so far so good

.: 2005.5 Audi S4 Avant 6spd manual
Stasis coilovers, Milltek cat, Milltek downpipes, Milltek resonated exhaust
. :2000 Jetta 1.8t - Daily

Old::
.: 2000 BMW M5 ::
HRE C21 19x8.5 and 19x10, Toyo Proxes T1R 255/35/19 (f) 285/30/19 (r), Bilstein PSS9 coilovers, Britalman X-pipe and Exhaust system, Britalman intake system, Exotics Tuning carbon fiber front lip, Range Rover 16:9 Nav screen, Dice ipod adapter, Ecode Angel eyes Xenon, LED rear tail update, black vinyl roof

2002 Audi A4 Avant
19x8.5 BBS RS-GT, Toyo T1R 245/35/19, GT27RS turbo kit, Revo software, Sportec front and sideskirts, S4 rear bumper, custom exhaust, Topspin Design sport seats, H-Sport S4 swaybars, AWE boost gauge

1999 GTI VR6, 1989 GTI 16V, 1994 Volvo 850 Turbowagon

http://www.cargathering.com/forum/im...ts/logo_sm.png
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