VRS Very Poor MPG

[vRS_WRC]

My VRS has suddenly started Juddering slightly when I put my foot down and I am lucky to get over 20 mpg (average 2 is 24 mpg) I have tried cleaning the MAF but it has made no diffrence although I did not take the MAF out of the tube.

I have ran vag com and not faults are found, is there any readings I can take with VAGCom to test the MAF?

also what other faults could cause mpg this bad? Please help it is costing me a small fortune to run the car. I am lucky to get 200mile to a tank of fuel (of superunleaded)

Thanks in advance,

Mark

[VRSPhil]

Coil pack perhaps? Maybe temperature sensor?

[David 8]

You can do a log of engine block 002 but you need to be in third gear from about 20mph at floor it all the way to the red line then you are looking for about 150-160g/s at about 6000rpm. You could do it in fourth or fifth but when you hit the redline you will be going like the clappers so third is better

Obviously you need to be safe when doing this i.e. private road

[DGW]

You can also use VAG-COM to monitor coolant temperature. When my Felicia was refusing to idle after a cold start, a diagnostic check revealed that the coolant temperature was way over 100°C - which was patently wrong. The engine was being underfuelled when cold hence the problems. Conversely, if the reading (signal) had been too low, the engine would be overfuelled when hot.

Does your car have the later modified dual temperature sensor fitted?

[vRS_WRC]

I had the Temprature Sender replaced about 12 months ago, it was replaced for a so called green top one, is this the part you are refering to.

My coolant temp gauge stays a 90 once warm

[vRS_WRC]

I did a log of block 020 as well as 120 at the weekend as I wanted to calculate power using the block120 spreadsheet here are the reaults I was unsure as how to read the MAF results

0-399 Nm 0-260 Nm active yes/no MAF

Engine Speed Nm Torque (Nm)

1280 399.8 143.1 ASR OFF 17.53

1440 399.8 162.7 ASR OFF 21.56

1640 399.8 176.4 ASR OFF 26.58

1840 399.8 201.9 ASR OFF 32.14

2080 399.8 235.2 ASR OFF 41.31

2360 399.8 276.4 ASR OFF 56.28

2640 399.8 305.8 ASR OFF 73.72

3000 399.8 313.6 ASR OFF 89

3320 399.8 305.8 ASR OFF 101.72

3600 399.8 305.8 ASR OFF 107.31

3960 399.8 309.7 ASR OFF 116.22

4320 399.8 305.8 ASR OFF 129.39

4640 399.8 303.8 ASR OFF 142.25

4920 399.8 290.1 ASR OFF 154.25

5200 399.8 280.3 ASR OFF 165.42

5440 399.8 274.4 ASR OFF 168.58

5720 399.8 260.7 ASR OFF 177.17

5920 399.8 264.6 ASR OFF 180.83

6120 399.8 215.6 ASR OFF 179.08

6200 399.8 223.4 ASR OFF 144.64

6360 399.8 211.7 ASR OFF 152.28

6480 399.8 211.7 ASR OFF 174.08

6560 399.8 194 ASR OFF 161.03

[DGW]

I had the Temprature Sender replaced about 12 months ago, it was replaced for a so called green top one, is this the part you are refering to.

My coolant temp gauge stays a 90 once warm

That is the part. I would still double-check the coolant temperature reading using VAG-COM. The temperature sender is a dual one and it might be that the temperature reading being provided to the engine ECU is wrong. I think you can also check the intake temperature as there is a sensor for that too.

[LJ_Matt]

Can't offer any advice as to what may be wrong :( but I found recently I was struggling to get 250 miles to a tank (worst was last week at 230 before the light :eek: ) so this week I have "adjusted" my driving style somewhat and after resetting the 2nd trip computer averages when filling up I now have the average at around 30.8 and have already done 250 miles with plenty left (predicted 110 ish).

It does involve driving like a grandad but just goes to show that when driven enthusiastically the vrs is a guzzler indeed, although it doesn't sound like simple heavy footedness is your problem!

[vRS_WRC]

Which block do I need to log for the temprate sender, also should it read the same as the temp on the dash?

[DGW]

Measuring Block - 08

Group 004

- Block 2 = Coolant Temp

- Block 4 = Intake Air Temp

[David 8]

I did a log of block 020 as well as 120 at the weekend as I wanted to calculate power using the block120 spreadsheet here are the reaults I was unsure as how to read the MAF results

0-399 Nm 0-260 Nm active yes/no MAF

Engine Speed Nm Torque (Nm)

1280 399.8 143.1 ASR OFF 17.53

1440 399.8 162.7 ASR OFF 21.56

1640 399.8 176.4 ASR OFF 26.58

1840 399.8 201.9 ASR OFF 32.14

2080 399.8 235.2 ASR OFF 41.31

2360 399.8 276.4 ASR OFF 56.28

2640 399.8 305.8 ASR OFF 73.72

3000 399.8 313.6 ASR OFF 89

3320 399.8 305.8 ASR OFF 101.72

3600 399.8 305.8 ASR OFF 107.31

3960 399.8 309.7 ASR OFF 116.22

4320 399.8 305.8 ASR OFF 129.39

4640 399.8 303.8 ASR OFF 142.25

4920 399.8 290.1 ASR OFF 154.25

5200 399.8 280.3 ASR OFF 165.42

5440 399.8 274.4 ASR OFF 168.58

5720 399.8 260.7 ASR OFF 177.17

5920 399.8 264.6 ASR OFF 180.83

6120 399.8 215.6 ASR OFF 179.08

6200 399.8 223.4 ASR OFF 144.64

6360 399.8 211.7 ASR OFF 152.28

6480 399.8 211.7 ASR OFF 174.08

6560 399.8 194 ASR OFF 161.03

You want something like this i have edited it slightly but this is what block2 will look likeair mass.txt

anything you don't get just ask

[vRS_WRC]

sorry the headers have not come out correctly

The 1st column is the engine speed the last is the Air Mass

I forgot to say my car has been remapped and has gone like stinck for about 6 months

Thank you all for your help

[vRS_WRC]

Dealer had a look at the car yesterday reckoned a turbo pipe was loose and now I am getting the following

13 Faults Found:

17633 - Fuel Injector for Cylinder 1 (N30): Short to Ground

P1225 - 35-10 - - - Intermittent

17635 - Fuel Injector for Cylinder 3 (N32): Short to Ground

P1227 - 35-10 - - - Intermittent

17636 - Fuel Injector for Cylinder 4 (N33): Short to Ground

P1228 - 35-10 - - - Intermittent

17634 - Fuel Injector for Cylinder 2 (N31): Short to Ground

P1226 - 35-10 - - - Intermittent

17833 - EVAP Purge Valve (N80): Short to Ground

P1425 - 35-10 - - - Intermittent

17955 - Boost Pressure Regulation Valve (N75): Short to Ground

P1547 - 35-10 - - - Intermittent

17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground

P1117 - 35-10 - - - Intermittent

17843 - Secondary Air Pump Relay (J299): Short to Ground

P1435 - 35-10 - - - Intermittent

17938 - Camshshaft Timing Adjustment: Short to Ground

P1530 - 35-10 - - - Intermittent

17829 - Secondary Air Injection Solenoid Valve (N112): Short to Ground

P1421 - 35-10 - - - Intermittent

17697 - Boost Pressure Control Valve (N249): Short to Ground

P1289 - 35-10 - - - Intermittent

16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 35-00 - -

16686 - Cylinder 2 Misfire Detected

P0302 - 35-00 - -

car is running like crap, any ideas? sound like they might of left a conector unpluged, if someone can give me a indication of which plug that would be great otherwise I will have to try and get time off work again.

[David 8]

sorry the headers have not come out correctly

The 1st column is the engine speed the last is the Air Mass

I forgot to say my car has been remapped and has gone like stinck for about 6 months

Thank you all for your help

In that case your maf looks fine mate to me

[vRS_WRC]

ok dealer states I need a new coil pack, is there anything I can check before I fork out seems strange to go just after the dealer had the car

[f1btn]

Dealer had a look at the car yesterday reckoned a turbo pipe was loose and now I am getting the following

13 Faults Found:

17633 - Fuel Injector for Cylinder 1 (N30): Short to Ground

P1225 - 35-10 - - - Intermittent

17635 - Fuel Injector for Cylinder 3 (N32): Short to Ground

P1227 - 35-10 - - - Intermittent

17636 - Fuel Injector for Cylinder 4 (N33): Short to Ground

P1228 - 35-10 - - - Intermittent

17634 - Fuel Injector for Cylinder 2 (N31): Short to Ground

P1226 - 35-10 - - - Intermittent

17833 - EVAP Purge Valve (N80): Short to Ground

P1425 - 35-10 - - - Intermittent

17955 - Boost Pressure Regulation Valve (N75): Short to Ground

P1547 - 35-10 - - - Intermittent

17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground

P1117 - 35-10 - - - Intermittent

17843 - Secondary Air Pump Relay (J299): Short to Ground

P1435 - 35-10 - - - Intermittent

17938 - Camshshaft Timing Adjustment: Short to Ground

P1530 - 35-10 - - - Intermittent

17829 - Secondary Air Injection Solenoid Valve (N112): Short to Ground

P1421 - 35-10 - - - Intermittent

17697 - Boost Pressure Control Valve (N249): Short to Ground

P1289 - 35-10 - - - Intermittent

16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 35-00 - -

16686 - Cylinder 2 Misfire Detected

P0302 - 35-00 - -

car is running like crap, any ideas? sound like they might of left a conector unpluged, if someone can give me a indication of which plug that would be great otherwise I will have to try and get time off work again.

Looking at that it seems that they probably disconected the battery but the misfire on coil pack 2 seems to be the problem!

[DGW]

This saga is currently running in 2 separate threads - which shouldn't be the case. I have therefore closed this thread and any further discussion can continue in the thread below:

http://www.briskoda.net/forums/diagnostics-vag-com/help-fault-codes-misfires/75829/

[vRS_WRC]

Right the car is back to how it was when I started the this thread, judder if you give it low throttle (fine if you floor it) not great when the wife and kids are in the car as I get told off for flooring it and the MPG is still on about 20mpg.

The coil pack 2 has been repalced.

I have cleaned the throttle body (as per the surging thread in the octavia forum) but I did not replace the paper gasket (as the local dealers did not have them in stock) it did look ok but I dont really know so I guess another trip to the biggest Audi garage in the uk (lol) for a piece of paper.

The 1.8T common Troubleshooter states

Poor Gas Mileage

[DGW]

The part name for the oxygen sensor is lambda probe. There are 2 - one before the catalyst and one after. They have different part numbers and are different sizes.

[vRS_WRC]

Just checked my other coil packs and the other 3 are all H versions, is this not the onnes that got recalled?

Just did a couple of vag com logs and there according to block 16 there is a misfire on cyl 4 (see attached logs) what do you guys reckon? should I try and get Skoda to replace the other h versions? whould they do it even if the have been fine for 5 years?

LOG-01-006-004-016.txt

LOG-01-001-004-015.txt

[vRS_WRC]

Right after reading this

http://www.briskoda.net/forums/octavia/ignition-coil-fail-rate-1-8t-engine/4365/3/?highlight=misfire

it looks like all mine should of been replaced awhile back, how do I stand with getting the others changed foc? Should I contact Skoda UK? or the dealer?

have we got the details on the bulliten so the dealer can look it up?

[DGW]

The D, G and H versions were the subject of a replacement Bulletin which has since expired after a suitable time interval for all affected cars to be checked and have the coil packs replaced as necessary. If you car has a full Skoda service history - ie there has been at least one opportunity for the Bulletin to be actioned by a dealer but it hasn't - then I would approach your local Skoda dealer and ask for a goodwill claim to be made to Skoda UK for the coil packs to be changed.

http://www.briskoda.net/forums/general-car-chat/ignition-coil-update/4286/?highlight=coil+pack+Bulletin

[David 8]

The D, G and H versions were the subject of a replacement Bulletin which has since expired after a suitable time interval for all affected cars to be checked and have the coil packs replaced as necessary. If you car has a full Skoda service history - ie there has been at least one opportunity for the Bulletin to be actioned by a dealer but it hasn't - then I would approach your local Skoda dealer and ask for a goodwill claim to be made to Skoda UK for the coil packs to be changed.

http://www.briskoda.net/forums/general-car-chat/ignition-coil-update/4286/?highlight=coil+pack+Bulletin

Dennis are you like the parts manager for skoda uk or summat

[DGW]

Dennis are you like the parts manager for skoda uk or summat

Nope. I just hoover up any available info and tuck it away for future reference.

[David 8]

I'm glad you do mate

Top Man !!!