I've just recently gone from stage 1 to stage 2 remap. Stage 1 ran fine, no problems, but since the new map was put on the car now randomly goes into limp mode but engine management light stays off.

 

I've checked on VAG-COM and the following codes are present:

 

Under Engine:

 

2 Faults Found:

16487 - Mass Air Flow Sensor (G70) 

            P0103 - 35-10 - Signal too High - Intermittent

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!) 

            P1297 - 35-10 -  - Intermittent

Readiness: 0010 1001

 

I have changed the OEM Bosch Valve for a Forge 008 as I thought this was the problem, but it still brings 17705 up.

 

Please see below for MAF Readings.

 

Under ABS Brakes:

 

2 Faults Found:

01314 - Engine Control Module 

            004 - No Signal/Communication - Intermittent

01314 - Engine Control Module 

            013 - Check DTC Memory - Intermittent

 

I have ESP fitted to my Octavia, and if I really put my foot down since the map, the yellow light comes on steady. According to handbook, that means ESP problems only and everything else will work fine.

 

Please see MAF Readings attached. Go to 190 seconds down in the first part of the log to see 2nd Gear - Full throttle.

 

Tried unplugging MAF and running, seems to run okay, no loss of power.

 

Can anyone give me an idea of what might be happening here?

LOG-01-002-xxx-xxx.CSV

Edited 15 June, 201511 yr by Squav

If unplugging maf makes no difference to running then its goosed and you need a new one from a dealer, not ebay... some of those other faults will probably go away with the new maf too but other smarter people will confirm

Your 013 codes are telling you there's fault codes logged which may effect the running of other things. There's a post about 17705 code and likely causes in this section check it out. My 17705 was a software issue in the remap, cured by a remap from somewhere else.

Unfortunately I can't open your file but your peak g/s should be around your horsepower when multiplied by 0.8. If it's way out maf sensor is faltering.

who mapped it?

As well as measuring the maf and thinking about software I'd be looking for boost leaks. An improvement with maf unplugged could be a coincidence, my limp mode was random...you're probably better off with the oem dv as well actually, although I don't think that's the problem.

I had 17705 from a bad map. It was a nightmare to pin down as the tuner was adamant that it wasn't the map at fault, but it actually was.. Eventually after replacing every boost & vacuum hose, DV, TB clean, etc I bit the bullet & had a Revo map put on & never saw 17705 again.

I would ask your tuner to put the old map back on & see if the problem persists. If it doesn't solve the issue you need to check all the vacuum/boost pipes + intercooler for splits ( all the pipework around & under the inlet manifold are notorious for splitting), & do a throttle body clean.