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#11
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Quote:
Also your MAF 18K/hour equates to 18,000/3600 = 5g/s. 5g/s at idle is kind of high so. If you look at the video I posted, my MAF g/s was 3.6g/s at 700 rpm. I think your MAF is over-reporting the airflow through it and the computer is trying to compensate for this data pid. You can try cleaning the MAF with MAF cleaner, don't use carb cleaner and make sure it is dried before starting the engine. Don't buy a cheap MAF from eBay or Amazon. Better to go to a junkyard and buy a genuine Siemens MAF.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
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#12
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Thanks, I meant to edit this post. The voltage is actually pretty static for the after cat sensors. My mistake.
Bank 1 after cat: voltage is 0.75 to 0.76 V Bank 2 after cat: voltage is 0.58 to 0.59 V Interesting theory, as far as I know the MAF is original, now 188,000 miles. The MAF has been cleaned recently as well, no change. Yes, used MAF cleaner! The car's exhaust definitely smells rich. The coil packs are also original, except one that was replaced. |
#13
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The M54 engine utilizes a "Hot Wire" in the MAF. Air passing through the MAF cools the "Hot Wire" and from the voltage that is used to keep the "Hot Wire" hot the computer can determine the amount of air rushing through the MAF. Like a light bulb, the "hot Wire" eventually starts to deteriorate until it fails. Since the "Hot wire" is not getting as hot as when it was new, the computer is just assuming that a lot of air is rushing through the MAF, so to accommodate this rush of air, the computer commands the injectors to provide additional fuel to the mixture.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#14
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I've finally replaced the MAF with a new VDO sensor from FCP here:
https://www.fcpeuro.com/products/bmw...em-13627567451 I'm not sure I really notice much of a drivability difference, maybe slightly better throttle response. But maybe that is all in my head lol. Here are the updated readings with the new MAF installed: 15 kg/h at idle 35 kg/h at 2000 rpm 44 kg/h at 2500 rpm 57 kg/h at 3000 rpm With the old, high mileage original MAF, the readings were: 18 kg/h at idle 44 kg/h at 2,000 rpm 55 kg/h at 2,600 rpm I'll wait for the gurus to chime in as to how much of a difference that is... next step is to replace those post-cat oxygen sensors. |
#15
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Post grams/second at idle with all accessories off. (lights, radio, AC/fan, etc). Should be hovering around 3.2 - 3.8 g/s
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Digital Competition Systems The older I get... The faster I was... No Fear |
#16
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Remember that the MAF is measuring the density of the air, so temp, humidity and barometric pressure all play a role in trying to compare readings.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#17
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If the car sits outside, check for wires chewed by animals (squirrels etc.)...
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
#18
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Took the readings again tonight, with daytime running lights and radio off. Everything off.
14 kg/h at idle 32 kg/h at 2000 rpm 41 kg/h at 2500 rpm 55 kg/h at 3000 rpm Seems to be driving fine, the one after-cat oxygen sensor says no signal so definitely going to replace both. I'm going to say that based on the info above, the new MAF has not improved the cocktail of codes condition haha. |
#19
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3.88 g/s. vs 5.00 g/s. difference 28% 8.88 g/s. vs. 12.22 g/s. difference 37% 11.38 g/s. vs. 15.27 g/s. difference. 34% 15.27 g/s Yep must be something else. Data doesn't lie
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD Last edited by upallnight; 03-19-2021 at 10:05 AM. |
#20
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The data shared yesterday with the headlights off cannot be accurately compared to the numbers with the old maf, where the headlights were on. It did end up making a difference in the readings with the daytime lights left on. |
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