The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [maf]

Anything related to MAF (Mass Air Flow) sensors.

Filter by
Sorted by
Tagged with
1
vote
1answer
39 views

2002 Silverado 4.3l wiring question, MAF sensor and water temp sensor throwing intermittent codes

My truck had been throwing intermittent MAF codes for a month, P0102 "low or no voltage." I only noticed due to the rough idle and "stumbling" on acceleration. I finally got around to giving the MAF a ...
3
votes
1answer
100 views

1986 Corvette - ECM code 33 & 36

My vintage 1986 Corvette convertible recently developed a stumble that progressed to a no-run condition. It comes and goes sometimes starting but in a few minutes I get a SES (Service Engine Soon) ...
0
votes
0answers
36 views

MAP or MAF used in Hyundai Accent?

I want to ask, what sensors does this car have? MAP or MAF or both? If it has both, which sensor is used at each point in time?
0
votes
1answer
50 views

Mass Flow Sensor missing

I've recently purchased a Volvo V70 I 2.4 (106kW, 1998, manual) and wanted to check the mass flow sensor for issues. But it appears that my car has none, even though I've seen them in all pictures and ...
5
votes
1answer
3k views

Why do modern PCMs prefer MAP over MAF

Why do modern PCMs prefer to use pressure sensors to estimate the air charge going into an engine instead of air flow meters. Eg they typically use a MAP sensor and complex software to estimate air ...
15
votes
3answers
53k views

What is the difference between a MAP and a MAF sensor

Generally a car uses either MAP or MAF to determine the air flow index the engine is getting and that older cars used to have MAP and newer ones often use MAF and cars like the Mitsubishi EVO uses ...
0
votes
0answers
18 views

Possible leaky vacuum hoses?

I have a 2011 Nissan Murano with an intermittent MAF sensor OBD code indicating poor performance. After trying to clean the MAF sensor and eventually replacing the MAF sensor, I am still continuing ...
1
vote
0answers
44 views

Does MAF has something to do with rough idle?

I am trying to solve my cars long issue in idles again. Cleaning the ICV did the trick before but it keeps coming back and I don't know what else to check. Here's the link in my previous question. ...
1
vote
1answer
231 views

MAF Sensor Performance Code in cold weather

I have a 2011 Nissan Murano with a check engine light that comes on and off. It started once the weather started turning cold, however the check engine light will disappear shortly after I get my OBD ...
1
vote
1answer
74 views

Is there anyway a shade-tree mechanic can check MAF calibration?

When it comes to testing MAF sensor on my vehicle, the factory service manual just suggests two PASS/FAIL tests: an out-of-circuit resistance reading at a particular ambient temperature validating ...
2
votes
1answer
42 views

Does the air intake system in a VW CC 2010 go around the engine?

I am trying to visualize what the air intake system in my car looks like. It's a turbocharged 2.0L VW engine. As I understand it, the air intake is on the front right near the radiator and headlight....
1
vote
1answer
691 views

IAT reading higher than ambient temp. Is that normal?

My car's engine comes with a Bosch hot film airflow mass meter. The probe inside the sensor's body features both the actual airflow sensor and what looks like a thermistor. I'm telling you that ...
5
votes
3answers
766 views

Engine shudders when tachometer falls to idle RPM from around 2K RPM

We're talking about a 2005 Volvo S80 2.5T 5-cyl engine vehicle here. Back in late September was the first time I experienced this engine shudder/stutter behavior when the tachometer dial went from say ...
1
vote
0answers
26 views

2001 Nissan Xterra drivability

2001 Nissan Xterra SE, 3.3L V6, automatic, 2WD, towing package, 150k miles Some history, perhaps useful: I bought this vehicle from a friend a few months ago. Vehicle was in good shape for its ...
1
vote
1answer
42 views

What kind of MAF sensor is this?

A Bosch MAF sensor from a 1994-1996 Volvo looks like this: I have read about different types of these old sensors and they all mention a "wire", however I cannot see a wire in this sensor, just a ...
1
vote
0answers
60 views

Check engine light won't stay off

I've attempted to get my check engine light fixed a couple times and at each repair facility they've scanned the code and told me it was a bad oxygen sensor. I had the oxygen sensor replaced at both ...
2
votes
0answers
429 views

Nissan MAF Volts to Grams per Second Conversion?

So my 99 Nissan Almera GA16DE 1.6L ( Euro Sentra ) is only OBDI, and only provides a voltage PID for the MAF. Anyone know of a conversion from volts to grams per second?
10
votes
2answers
18k views

Power loss in truck - triage options?

I've asked at least one question about my specific situation earlier, but at this point, I'm looking for information on how to operate in triage mode, my primary goal is to get my truck working well ...
3
votes
1answer
1k views

BMW 320D 2010 hesitating to accelerate while on highway for few seconds

Recently my 2010 BMW 320D had been playing up. Overall performance of the car has been fine. But this weekend it started to struggle to accelerate on the highway for few seconds and was fine ...
2
votes
0answers
99 views

2002 Nissan Sentra XE (1.8) bogs down under heavy acceleration

This is my first time asking for help here so please bear with me. As the title says, my 2002 Sentra XE bogs down when my try to accelerate hard. It's more noticeable from a stop, but seems to do ...
0
votes
1answer
370 views

p0104 MAF sensor

I'm having a P0104 error code, but there's no MAF sensor in my car (Focus mk2). There is a MAP sensor in it, but that should have another error code. Any idea how this is possible ?
1
vote
3answers
219 views

'98 Subaru Legacy Outback — does this sound like a broken MAF?

Starts fine, idles for a couple seconds, then stalls itself. No CEL the first time or two. Here's a video of the stall behavior. I suspect the MAF because I was recently mucking around removing the ...
7
votes
4answers
188k views

Sputtering while driving & idling

[My car: 2004 Mazda 3] So, my wife came home from running some errands and told me the check-engine light was on and that the car was sputtering and felt like it was going to stall while stopped at ...
0
votes
3answers
3k views

open-loop vs closed loop

My car sprung a P0101 pending code recently, which shows up as a Mass or Volume Air Flow Sensor "A" Circuit Range/Performance on my BlueDriver OBDII scanner. I started to read this article SUCCESSFUL ...
9
votes
3answers
58k views

Mass Air Flow Expected Values

I have a 2002 Audi A4 Quattro 3.0. I have a Vagcom USB cable and I am trying to diagnose the MAF sensor. I had a friend get some readings from an OBD2 scanner, which indicated that both precat O2 ...
3
votes
1answer
625 views

Cleaned throttle body, MAP sensor suddenly dead

(Solstice) So, I cleaned my throttle body with brake cleaner. I thought it was carb cleaner, but I am apparently illiterate. (Honestly, I'm not sure what the difference between them is.) I was very ...
8
votes
1answer
387 views

Anyone have experience with a faulty fuel press? Regulator?

I've been dealing with a car that starts and then suddenly dies. I replaced the MAF (Mass Air Flow) sensor with a new one, and now it stays on until I press the gas pedal. The throttle body is clean. ...
6
votes
1answer
738 views

Is this a right MAF signal?

I've just bought this MAF sensor for the injection setup I'm going to build, and first I was struggling to figure out how to connect it. It's used for several BMW cars.(E38,E39,Z3) On the connector it ...
6
votes
1answer
717 views

1998 V6 Mustang -20+ LTFT on both banks

I just finished doing a bunch of work on my Mustang (replaced all gaskets down to head gaskets on engine, had the heads milled and a valve job done, replaced all the fuel injectors, new fuel injector, ...
4
votes
1answer
191 views

Chevy 2007 Trailblazer Sputtering in the Morning. Code P0171 has come up in the past

For a little over a month, the P0171 (System too Lean) code has been coming up. My brother has cleaned the throttle and the MAF (Mass Air Flow) sensor. It then worked fine for a few weeks, then the ...
6
votes
1answer
717 views

Should you replace the MAF sensor housing when replacing the MAF sensor itself?

When I search for a MAF (mass air flow) sensor on a parts website, I see some that are sold with the housing and some without. A mechanic gave me a quote that correlates price-wise with the full ...
3
votes
2answers
4k views

1996 Ford E350 (5.8L) Mass Air Flow Sensor - where is it?

I can't find the MAF sensor on my 96 Ford E350. (Been googling for hours :)) In case a picture helps: Like I said, I've been looking for quite a while, and I can't find anything. Thanks!
12
votes
1answer
623 views

How is it advantageous for fuel management to detect negative mass air flow?

Here is the flow-voltage mapping for the Bosch sensor utilized by my E39 M5. I find it curious that readings below 0.9 V correspond to negative flows. Questions Is it possible that air can flow the ...
2
votes
1answer
540 views

What does the OBD error code P0100 mean?

What does the OBD error code P0100 mean? I have an engine misfire with the check engine light on in my Nissan N16 Supper Saloon -1300cc - 2000 model year. The engine started to produce less power. An ...
2
votes
4answers
5k views

Check engine lights came up after Air filter change?

Yesterday I changed air filters in my car (Nissan supper saloon N16 - model year 2000). After installation the check engine light came on when I started the engine and the engine seemed to be running ...
4
votes
1answer
796 views

Calculating AFR using injector flow rate and mass air flow

Is injector flow rate = Mass fuel flow? If so then AFR = MAF/Injector flow rate. Can someone please confirm this?
3
votes
1answer
1k views

How can one calculate volumetric efficiency without a MAF sensor?

I am completely new in the field of OBD2 sensor; I am looking for a method (or a formula) to calculate Volumetric Efficiency of: Diesel Car Petrol Car which do not have a MAF sensor. Can anyone help ...
8
votes
3answers
4k views

Calculating MPG from MAP sensor (or converting MAP data to MAF data)

My 2002 Honda Accord V6 has a Manifold Absolute Pressure sensor (MAP). I understand that this sensor gives out information in pressure units (psi or equivalent). After doing a bit of research, I ...
0
votes
2answers
6k views

Why does RPM jump between 1000 and 2000 at standstill (2002 Mercedes-Benz CLK 200 K)?

My car has a kind of a rough idle and it's like it gives a bit of gas, meter goes between 1000 and 2000 rpm at standstill. Same if I shift up to 1 or 2nd gear. If I then take it for a drive, car jerks ...
2
votes
1answer
14k views

What exactly is OBD Calculated Load?

OBD Calculated Load is defined as: LOAD_PCT = [current airflow] / [(peak airflow at WOT@STP as a function of rpm) * (BARO/29.92) * SQRT(298/(AAT+273))] But when I am in neutral and I open the ...
1
vote
1answer
2k views

MAF sensor output signal vs. RPM?

I read that the MAF sensor output voltage increases as RPM increases. The ECU uses this voltage to determine other things, like idle RPM, ignition timing, fuel injectors, etc. Where can I find the ...
1
vote
2answers
6k views

Where is the MAF Sensor on a Peugeot 207?

I'm getting loss of power when idling and spluttering and the OBD is telling me the engine is running rich. I want to try cleaning or replacing the MAF sensor, but... I'm no mechanic and I'm just not ...
4
votes
1answer
2k views

Can I use the same AFR sensor on both banks (bank 1 sensor 1 and bank 2 sensor 1)

Have 1mzfe (skip this paragraph if you don't want backstory) codes p1135/p1130/whatever the ones for the other bank are/ all showed up at the same, perfect time. ie when I was broke. Since then car ...
5
votes
1answer
4k views

How to clean the MAF sensor on a 1997 Nissan Altima?

I have a 1997 Nissan Altima sedan. I’ve been told the issues I’m having with my car is from the mass air flow sensor. I was wondering how to clean/repair this sensor and contact points the best? What ...