MAF dead...

tstrahonja · Apr 27, 2009

I bought my Cupra remapped and i dont know what map is it, but it boosts to 1.4 bar and holding at 1.1 bar...
It started to go into limp mod every 2 or 3 days and i got the fuel trim, bank 1- system too lean code...
I think MAF is the problem so here are some readings done in 3rd gear..

Code:

,Group A:,'002,,,,Group B:, Not Running,,,,Group C:, Not Running
,,RPM,Load,Inj. On Time,Mass Flow,,,,,,,,,,
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, /min,%, ms, g/s,STAMP,,,,,STAMP,,,,


,29.08,1520,65.4,8.20,19.78,,,,,,,,,,
,29.38,1560,66.9,8.61,20.89,,,,,,,,,,
,29.68,1600,69.2,9.43,22.06,,,,,,,,,,
,29.98,1680,69.9,9.43,22.56,,,,,,,,,,
,30.28,1720,75.2,11.07,26.22,,,,,,,,,,
,30.58,1760,78.9,11.07,28.47,,,,,,,,,,
,30.98,1840,82.7,11.89,30.47,,,,,,,,,,
,31.28,1920,85.7,12.30,33.67,,,,,,,,,,
,31.58,2000,89.5,13.53,36.36,,,,,,,,,,
,31.88,2080,94.0,14.35,39.86,,,,,,,,,,
,32.18,2160,97.0,13.94,41.31,,,,,,,,,,
,32.58,2240,102.3,15.17,46.61,,,,,,,,,,
,32.88,2320,106.0,15.58,49.17,,,,,,,,,,
,33.18,2440,109.0,16.40,52.31,,,,,,,,,,
,33.48,2520,112.0,17.22,56.14,,,,,,,,,,
,33.78,2680,115.8,17.63,60.47,,,,,,,,,,
,34.08,2720,119.5,18.45,64.39,,,,,,,,,,
,34.38,2840,124.1,19.27,70.67,,,,,,,,,,
,34.68,2960,130.8,20.09,77.47,,,,,,,,,,
,34.98,3040,139.1,21.32,84.25,,,,,,,,,,
,35.28,3200,144.4,22.96,90.67,,,,,,,,,,
,35.58,3320,145.9,22.96,93.03,,,,,,,,,,
,35.98,3480,143.6,22.96,94.50,,,,,,,,,,
,36.28,3600,139.8,22.14,94.67,,,,,,,,,,
,36.58,3720,138.3,22.14,96.94,,,,,,,,,,
,36.87,3840,136.1,21.73,99.83,,,,,,,,,,
,37.27,3960,136.1,21.73,102.31,,,,,,,,,,
,37.57,4040,134.6,21.73,104.08,,,,,,,,,,
,37.87,4200,134.6,22.14,109.89,,,,,,,,,,
,38.17,4320,133.8,22.14,108.81,,,,,,,,,,
,38.57,4400,135.3,22.96,114.39,,,,,,,,,,
,38.87,4520,134.6,22.96,116.19,,,,,,,,,,
,39.17,4600,134.6,22.96,118.47,,,,,,,,,,
,39.47,4720,134.6,22.96,121.72,,,,,,,,,,
,39.77,4840,134.6,22.96,124.64,,,,,,,,,,
,40.08,4920,133.1,22.96,126.42,,,,,,,,,,
,40.38,5040,133.8,22.55,127.75,,,,,,,,,,
,40.68,5160,131.6,22.55,129.56,,,,,,,,,,
,40.97,5200,131.6,22.55,129.94,,,,,,,,,,
,41.28,5280,128.6,22.14,130.50,,,,,,,,,,
,41.58,5360,128.6,22.14,131.33,,,,,,,,,,
,41.97,5480,124.8,21.73,131.25,,,,,,,,,,
,42.28,5520,124.1,21.32,130.44,,,,,,,,,,
,42.57,5600,123.3,21.32,131.69,,,,,,,,,,
,42.88,5680,122.6,20.91,131.69,,,,,,,,,,
,43.18,5760,121.1,20.91,133.44,,,,,,,,,,
,43.48,5840,120.3,21.32,133.89,,,,,,,,,,
,43.78,5840,118.8,19.68,133.25,,,,,,,,,,

I assume g/s should reach 150,160 at high revs, and around 130,140 on 4000 rpm...
Can someone confirm that the MAF is a problem?

DaNnY_LaD · Apr 27, 2009

Have you got any codes?

tstrahonja · Apr 27, 2009

fuel trim, bank 1- system too lean

something like this..unfortunatley my friend with vag com deleted it be4 too quickly so i didnt remeber it very well...

DaNnY_LaD · Apr 27, 2009

When you logged the maf was it in limp mode or not?

If not and was running fine id say maf...

tstrahonja · Apr 27, 2009

it was not in limp mode
1st we deleted fault code cuz it was boosting only to 0.5 bar being in limp mode..and then we took these logs
i just want to be sure its MAF cuz no1 here has 1.8t and i cant try someone elses MAF...so i have to buy one..

greg · Apr 28, 2009

Delete the code then try driving the car for a few days with the MAF disconnected (just disconnect the electrical plug. The ecu will run on preset values rather than using data from the MAF. If the problem does not occur during this time it is likely the MAF is causing the problems and best to invest in a new one.

tstrahonja · Apr 29, 2009

ive bought a new MAF and logs are better now

Code:

Saturday,28,April,2007,21:55:10
6K0 906 032    ,,1.8L R4/20VT SEA    0002,

,Group A:,'002,,,,Group B:, Not Running,,,,Group C:, Not Running
,,RPM,Load,Inj. On Time,Mass Flow,,,,,,,,,,
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, /min,%, ms, g/s,STAMP,,,,,STAMP,,,,

,13.09,2120,100.8,15.99,43.44,,,,,,,,,,
,13.39,2200,104.5,16.40,44.61,,,,,,,,,,
,13.69,2280,107.5,17.22,47.75,,,,,,,,,,
,13.99,2360,111.3,18.04,53.83,,,,,,,,,,
,14.29,2440,116.5,19.27,56.56,,,,,,,,,,
,14.59,2560,121.1,20.09,61.47,,,,,,,,,,
,14.89,2680,127.8,20.91,67.97,,,,,,,,,,
,15.19,2800,133.8,22.14,74.50,,,,,,,,,,
,15.49,2880,143.6,23.78,84.08,,,,,,,,,,
,15.79,3000,152.6,25.42,90.19,,,,,,,,,,
,16.19,3160,156.4,26.24,94.56,,,,,,,,,,
,16.49,3280,153.4,26.24,94.11,,,,,,,,,,
,16.79,3440,150.4,25.83,94.39,,,,,,,,,,
,17.09,3520,148.9,25.83,97.33,,,,,,,,,,
,17.49,3680,145.9,25.42,101.00,,,,,,,,,,
,17.79,3800,144.4,25.01,103.89,,,,,,,,,,
,18.09,3880,143.6,25.42,105.22,,,,,,,,,,
,18.39,4000,142.9,25.42,109.64,,,,,,,,,,
,18.69,4120,142.9,25.42,110.97,,,,,,,,,,
,18.99,4240,142.9,25.83,113.72,,,,,,,,,,
,19.29,4320,144.4,26.24,119.03,,,,,,,,,,
,19.59,4440,144.4,26.24,122.08,,,,,,,,,,
,19.89,4560,145.9,26.65,125.64,,,,,,,,,,
,20.19,4640,146.6,26.65,130.97,,,,,,,,,,
,20.59,4760,145.9,26.65,133.08,,,,,,,,,,
,20.89,4880,145.1,26.65,134.06,,,,,,,,,,
,21.20,4960,144.4,26.24,137.22,,,,,,,,,,
,21.49,5040,142.9,27.06,136.61,,,,,,,,,,
,21.79,5160,142.1,26.24,139.33,,,,,,,,,,
,22.20,5280,141.4,26.65,140.67,,,,,,,,,,
,22.60,5360,139.1,25.83,142.94,,,,,,,,,,
,22.90,5440,137.6,25.83,142.81,,,,,,,,,,
,23.19,5560,136.8,25.01,144.86,,,,,,,,,,
,23.49,5640,134.6,25.01,145.86,,,,,,,,,,
,23.79,5680,134.6,25.83,145.42,,,,,,,,,,
,24.09,5760,132.3,25.42,142.61,,,,,,,,,,
,24.39,5840,132.3,25.01,146.89,,,,,,,,,,
,24.69,5880,130.1,25.01,145.00,,,,,,,,,,
,24.99,5960,130.8,25.42,145.36,,,,,,,,,,
,25.39,6040,127.8,24.19,147.42,,,,,,,,,,
,25.69,6080,127.1,24.19,146.64,,,,,,,,,,
,25.99,6160,126.3,23.78,148.97,,,,,,,,,,
,26.29,6200,124.8,23.78,148.19,,,,,,,,,,
,26.59,6200,123.3,23.78,145.64,,,,,,,,,,
,26.89,6280,122.6,23.37,148.50,,,,,,,,,,
,27.19,6320,122.6,23.37,148.44,,,,,,,,,,
,27.49,6400,121.8,22.55,152.11,,,,,,,,,,
,27.79,6440,119.5,22.96,147.22,,,,,,,,,,
,28.09,6480,119.5,22.55,146.14,,,,,,,,,,
,28.39,6520,118.0,22.14,147.17,,,,,,,,,,
,28.69,6560,118.0,22.14,149.47,,,,,,,,,,

hopefully my problem is solved...

Shytot · Apr 30, 2009

Gents

I want to add a bit of pipe, say 2 or 3" between the MAF and the Airfilter, what pipe diameter do I need for a standard MkIII set up?

Many thanks

p34ch3y · Apr 30, 2009

Shytot said:
Gents

I want to add a bit of pipe, say 2 or 3" between the MAF and the Airfilter, what pipe diameter do I need for a standard MkIII set up?

Many thanks

70mm

Shytot · Apr 30, 2009

Thanks p34ch3y, saved me disconnecting it from the AF. What do you play on XBL?

Forbez · May 1, 2009

Got my map out, and managed to get back to the original post.

There doesn seem that much difference in the results , you were hitting 145 on the first logs.

You should have tried cleaning the element in the MAF firstly, before buying a new one, (but its good to have a spare.)

Could be vac leak so check al the piping.
I replaced loads on mine, £00's worth, and it turned out to be an issue with the remap. (2nd hand ecu)

tstrahonja · May 2, 2009

I was hitting 133 in the 1st logs..i think you are watching the wrong column..or i am

Hit 150 on 2nd logs....
Anyways few days passed and it is still boosting...usually it would definitley be in the limp mode by now...
And it seems that it uses less fuel...my consumption went down by 2 ltrs/100 km....
Although maybe i was just more gently with the throttle(not likley though

)

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MAF dead...

tstrahonja

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DaNnY_LaD

Big Turbo Leon Cupra R

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DaNnY_LaD

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greg

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p34ch3y

tastefully modified

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