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Discussion Starter #1
Hey guys,

I think I already know the answer to this but I wanted to verify with the experts here.

Lately, my girl's been running a bit rough. When she's cold and I have to come to a sudden stop outside of my cul-de-sac, it's like it doesn't know how to handle it and the engine will start to sputter rather intensely (it feels as though the e-brake is on but you're still driving - if that makes sense) - it's been weird and uncharacteristic of my car to do.

I've also noticed a gradual increase in power loss when accelerating - I will accelerate gradually, and it won't use 100% of the power, it will sort of accelerate like 50% of the way, then realize it's only at 50% and then 'notch/lurch up' to 100%. Today on my way to school, I went to accelerate out of the cul-de-sac (cold engine and cold morning) and the throttle did nothing - and essentially stalled on me. The car would turn over but would not start for some time - eventually got it started earlier tonight and re-parked in my garage.

I have new TB, DSG, battery, and alternator installed but I'm wondering if this is a classic case of the MAF gone bad. I've attached the fault code - just wanted to get a second opinion.

Thanks in advance,

Paul

SCAN:
Address 01: Engine Labels: 038-906-016-BEW.lbl
Part No SW: 03G 906 016 AC HW: 028 101 223 9
Component: R4 1,9L EDC G000DG 7551
Revision: --H01--- Serial number:
Coding: 0050078
Shop #: WSC 00066 000 00000
VCID: 6492A4570257AC771A5-8030
1 Fault Found:
000257 - Mass Air Flow Sensor (G70)
P0101 - 000 - Implausible Signal
Freeze Frame:
Fault Status: 01110000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 343084 km
Time Indication: 0
Date: 2000.00.00
Time: 16:10:35
Freeze Frame:
RPM: 1449 /min
Speed: 44.0 km/h
Temperature: 6.3°C
Absolute Pres.: 1091.4 mbar
Mass Flow: 19.91 g/s
(no units): 2.59
Temperature: 90.0°C
Readiness: 0 0 0 0 0
 

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I see you have never made an intro since you joined this forum?

VAG Error Code: 16485/4794/7330/5667/4795/000257

EOBD II Error Code: P0101

Fault Location:
Mass Air Flow (MAF) Sensor (G70) - Circuit Range/Performance Problem/Implausible Signal

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Loss of Power.
Erratic Idle.

Wiring/Connector(s).
Air Leak(s) after Mass Air Flow (MAF) Sensor (G70).
Excessive restrictions in the Intake/Exhaust System.
Dirty air filter, clogged snow screen, clogged CAT.
Mass Air Flow (MAF) Sensor (G70) faulty,
Ground Spots corroded or Paint Residue.

Possible Solutions:
Check/Replace all faulty Wiring/Connector(s).
Check Intake Air Filter.
Check Mass Air Flow (MAF) Sensor (G70).
Check Earth Points.
Read Measuring Value Blocks (MVB).
Mass air flow vs upper threshold model < 60 - 800 kg/h.
Lower threshold model < 0 - 400 kg/h.
Load calculation > 18%.
Fuel system < -17%.

Special Notes:
In MY 1995-2002 (?) in Europe at VW diesel cars Mass Air Flow (MAF) Sensor (G70) had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [Measuring Value Blocks (MVB) - 08], group 003 (3e gear, full throttle, from 1700-4000rpm).
It is not uncommon for a TDI to set Implausible Signal Mass Air Flow Sensor (G70) faults when the engine performance is reduced due to a mechanical problem. These mechanical problems may include, but are not limited to:
Faulty electric fuel pump or Restricted fuel filter. See the Fuel Pump Basic Settings for PD, PPD, and CR TDI Engines page for Basic Settings tips after replacement.
Excessive restrictions in the intake/exhaust system.
Internal camshaft/valve/lifter problems.

Tech Notes:
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

When is the code detected?:
A high voltage from the sensor is sent to Engine Control Module (ECM) under light load driving condition.
A low voltage from the sensor is sent to Engine Control Module (ECM).

Description:
The Mass Air Flow (MAF) Sensor (G70) is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the Engine Control Module (ECM) a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the Engine Control Module (ECM) must supply more electric current to maintain the temperature of the hot film as air flow increases. The Engine Control Module (ECM) detects the air flow by means of this current change.

Any problems search TDI Wiki as that covers write ups and forum posts.

As taken from my new Free EOBD II Error Codes software
 

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Has the cam ever been replaced? Sounds like a typical worn cam issue. Try disconnecting the MAF sensor and see if it still stalls and is hard to start. If no significant change, check for a worn cam.
 

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Premium Member
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Discussion Starter #4
Has the cam ever been replaced? Sounds like a typical worn cam issue. Try disconnecting the MAF sensor and see if it still stalls and is hard to start. If no significant change, check for a worn cam.
Thanks, atikovi. I think this may be the issue, installed a new MAF and it still stalled. Got 350k km's on it - it's probably time.
 
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