I have done some runs tonight to try and isolate 17705 issues. I can clear the code start the car on the drive and the code will be registered before I'm off the drive? The questions I have are:

1) should this be under Vag-Com? or Octavia 1?

2) Block 032 on a 51plate, how often should the values change? I ran for about 2 minutes with both values at 0 until the first one changed to -0.2, -0.4 settled at -0.6 and the second value took a further 20 seconds to change to -0.8 and thats where they stayed over 10 mins of driving. on another run they went to -0.6 and -2.3 but again no fluctuations? is that normal? is it because the Lambdas are the older non wideband type?

3) Block 002 - under "Air Mass in" why would I get a value "Map 2"? :confused: only appears once about 55 seconds into a run?

4) should there by occasional random (higher than expected) values like below :eek:, as the MAF was new at the same time as the gas conversion (3-4 months ago)

Idle speed Engine load Inj. period Air mass in

91.21 3360 97 15.64 297.99

5) what is the approximate conversion for Air flow to BHP? as this run seemed to have produced stable figures

TIme stamp revs engine load inj period air mass in

60.35 1400 18 3.06 7

61.24 1520 81.2 9.52 27.61

62.16 1920 95.5 11.22 40.14

63.07 2400 117.3 11.9 67.56

63.96 3080 160.9 14.96 120.92

64.78 3760 151.9 13.26 116.31

65.58 4400 164.7 14.62 157.58

66.39 5000 142.9 13.94 163.61

67.39 5720 174.4 24.48 188.81

68.3 6240 154.9 22.78 187.17

6) on a block 120 I do a good run with the car pulling like mad and then the boost goes, I keep getting the actual boost stuck at around 1350 tops? is this LIMP :thumbdwn:? and if so how does it limit it so precisely?

A long list I know but I love it when it runs right and need to stop the boost dissapearing, I never know what sort of response I am going to get when I plant the load pedal

Edited 20 February, 200917 yr by karlbar2k
tried to paste a table into HTML Doh!

RE 5) the figures I have found on the cupra and mkiv forums suggest divide air mass by 0.8 (between 0.83 or 0.77 as the extremes) or multiply by 1.25 or 1.31 for a mapped car.

that would mean that taking the middle 0.8 figure I would be getting 235BHP?????? this is clearly not right so can a boost leak cause higher MAF readings I.E. the air IS passing through the MAF but not getting to the engine?

Yes an air leak does increase maf readings as i found out when a pipe blew off once (forgot to put a clip on). Your readings do look a little high. I think you have the ecu evo map on, mine for eg gives 170g/s @5720rpm & 175g/s@ 6240rpm with ecu evo map just to compare to yours.

Mine does have full performance exhaust too which should give higher figures.

cheers Martin, I thought they were a bit high.. just be glad to stop the boost being limited, I can get the 17705 on the drive! but dont think it is directly related to the boost dropping as turning engine off and back on brings the boost back in. sometimes for a couple of hundred yards sometimes for a whole 25 mile journey. just seems to be random. I have noticed that when warm I do sometimes get a stutter in 5th. Part throttle on the motorway is the usual, its like a multiple missfire that causes the speed to drop. Ive tried running bost log to see if it is overboosting but they are not conclusive (**** laptop can only manage 0.8 scan rate with three blocks)

No stutter is not normal, i presume you have checked the vacuum hoses under the inlet manifold? Other than this i think this code is very mysterious, I'm just glad I've never had it.

I replaced the one that goes from under the inlet manifold and joints into the pipe that goes up to the Y breather pipe (also replaced both of those with silicone ones from the states), and I have poked and prodded every pipe i can under the manifold. I have replaced the notorious boost pipe from the turbo to pancake pipe (not to happy wiht the way the new pipe fits either? am considering some of the fixes from the mkiv forums but will probably be best to get a spareset of pipes to attack with the Dremel

Yes an air leak does increase maf readings as i found out when a pipe blew off once (forgot to put a clip on). Your readings do look a little high. I think you have the ecu evo map on, mine for eg gives 170g/s @5720rpm & 175g/s@ 6240rpm with ecu evo map just to compare to yours.

Mine does have full performance exhaust too which should give higher figures.

mine peaks at 175g/s my 1.8t 150 thats remapped. have a hesitation problem which is slowly getting better as i try some of the cures but i have the same error code. sometimes when i start the car from cold it starts in limp mode. turn it off and back on straight away and it fine

getting forge tip and hose kit soon to try and eliminate the hesitation. im hoping the cold start problem is due to the stored error code but then that wouldnt explain why if i turn it off and back on it cures it!

Have you cleaned and reset the throttle body?

Sorts the 17705 usually if all other pipes are fine.

Have you cleaned and reset the throttle body?

Sorts the 17705 usually if all other pipes are fine.

did the TB clean approx 2 months ago. is it possible the extra boost is forcing more gunk out of the I/C up to the TB? noticed yesterday that the Idle was a bit off as well, its normally rock solid.

what should the target values in block 032 be Lummox? mine is at -0.6 and -0.8 on the one run and -0.6 and -2.3 on another. (both on LPG so not sure if it makes a difference?) and does a minus figure on the first one signify a boost leak as well?

Copied from vw vortex-

Block 032 - Oxygen Sensor Control Learned Values

Block 032. Field 1 represents the fuel trim at idle (additive) and Field 2 represents the fuel trim at part load (multiplicative), i.e., while driving. The value should be between -10 and +10% (negative indicates the engine is running rich and positive indicates the engine is running lean). If the value is close to +25% (which is the upper limit), it usually means that the MAF is bad. If the value is somewhere betweeen +10 and +25%, it could mean that the pre-cat oxygen sensor is bad, there is a leak in the intake or that the MAF is on it's way out.

Have you cleaned and reset the throttle body?

Sorts the 17705 usually if all other pipes are fine.

thats 1 thing i havent done yet. may look at that when i do all the pipes, time permitting.

Copied from vw vortex-

Block 032 - Oxygen Sensor Control Learned Values

Block 032. Field 1 represents the fuel trim at idle (additive) and Field 2 represents the fuel trim at part load (multiplicative), i.e., while driving. The value should be between -10 and +10% (negative indicates the engine is running rich and positive indicates the engine is running lean). If the value is close to +25% (which is the upper limit), it usually means that the MAF is bad. If the value is somewhere betweeen +10 and +25%, it could mean that the pre-cat oxygen sensor is bad, there is a leak in the intake or that the MAF is on it's way out.

I found this one a while ago but forgot to add to my favourites. from another site I found a negative value in the Idle one indicates - a boost leak and a positive value - a Vac leak. is this right?

also tried the Dogfood tin pressure tester yesterday and heard what sounded like oil gurgling? after some searching found its normal! so will have to try it again with more pressure (only got to 1-2 PSI and bottled it on hearing the noise :eek:)