2008 1.4i polo 9n heavy on petrol

Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay so I've spent the past few hours changing the thermostat and I'm quite happy with the results. Once the heat Guage reached 90°C, it never dropped regardless of how cold it is and what speed I was driving which is exactly what you guys told me.

Thanks alot for all the advice guys.

There's still that matter regarding the fuel consumption, however I will monitor that over the next few days to see if the fuel economy has improved now that the vehicle is running at the right temperature.

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n.gov3
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Re: 2008 1.4i polo 9n heavy on petrol

Post by n.gov3 »

Neeven wrote: Fri Oct 01, 2021 12:07 am Okay so I've spent the past few hours changing the thermostat and I'm quite happy with the results. Once the heat Guage reached 90°C, it never dropped regardless of how cold it is and what speed I was driving which is exactly what you guys told me.

Thanks alot for all the advice guys.

There's still that matter regarding the fuel consumption, however I will monitor that over the next few days to see if the fuel economy has improved now that the vehicle is running at the right temperature.

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That's great news..... Fuel consumption should improve however there's many other variables that can affect that. Variables such as driving style, percentage driven on highway vs urban, health status of your engine, etc
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

n.gov3 wrote:
Neeven wrote: Fri Oct 01, 2021 12:07 am Okay so I've spent the past few hours changing the thermostat and I'm quite happy with the results. Once the heat Guage reached 90°C, it never dropped regardless of how cold it is and what speed I was driving which is exactly what you guys told me.

Thanks alot for all the advice guys.

There's still that matter regarding the fuel consumption, however I will monitor that over the next few days to see if the fuel economy has improved now that the vehicle is running at the right temperature.

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That's great news..... Fuel consumption should improve however there's many other variables that can affect that. Variables such as driving style, percentage driven on highway vs urban, health status of your engine, etc
Okay I will fill till auto stop and use the car and fill again as you suggested, to see exactly how many kms per litre I'm doing now

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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

I used to have a spreadsheet that would calculate fuel consumption off a full tank. I'll see if I can find it, but you will need to be very diligent about recording in your exact mileage and how much fuel you fill and you will need to track it over a few months. When you top up R100/R200 here and there it tends to mess the calculations up a bit.

There might be newer versions online now but it used to work for me back in the day.

Have you ever added Wynn Fuel Injector cleaner to your vehicle? I've done it religiously on my 2001 MK3.5 Cabrio due to its age. Usually every 5000KM's and also before a very long drive to the coast (when we would take it). These days its basically once a year as the car is now a weekend toy but I do like to take her on long drives on the highway so that the car is in final drive at cruising speed to get the stuff through the system.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay great, when you do find the spreadsheet I will use it to calculate my fuel consumption.

I have been thinking of using injector cleaner once the thermostat situation has been solved, I will give it a try.

I'm just wondering, is there any way to test the O2 sensors to see if they're functioning properly?

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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

You can test them with a VAGCOM or if you really want to get hands on, you could use a multi-meter.

If the scans that VW and the other places did didn't flag it as a problem and your engine check light isn't on I wouldn't worry about it.

I think you mentioned that you did a decat on your exhaust. If the place didn't do the bung properly is might throw readings off a bit, but its hard to diagnose with out physically interacting with the ECU or testing the unit itself.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
MK1 Build Register: https://www.vwclub.co.za/forum/viewtopi ... 1&t=192835
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Racing is meant for the RACE track - deal with it...
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

EX-DOHCTOR wrote:You can test them with a VAGCOM or if you really want to get hands on, you could use a multi-meter.

If the scans that VW and the other places did didn't flag it as a problem and your engine check light isn't on I wouldn't worry about it.

I think you mentioned that you did a decat on your exhaust. If the place didn't do the bung properly is might throw readings off a bit, but its hard to diagnose with out physically interacting with the ECU or testing the unit itself.
Okay, if it's not throwing signals then I think I'd best not go looking for issues where there isn't any.

I'll monitor the fuel consumption for now and perhaps try the fuel injector cleaner.

I've seen a few videos on YouTube where they take out the injectors and clean them individually, that seems like a good method but I'd have to ask a mech to do that for me

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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

Normally they would do ultrasonic cleaning and then a spray test. I'd only do an injector clean when there is a confirmed problem with them.
Otherwise you will be spending a lot of money for nothing.

For now, lets monitor the vehicle for a while, get a full tank in the car, add the Wynns Fuel Injector cleaner and then drive out the tank.
Consider that the starting baseline tank.

Measure how many litres you filled and how much mileage you got. I did a quick check online and the formula is as below:

Calculating consumption and range

Simply note down the distance travelled since the last top-up and then take a note of how much fuel it consumed to travel that distance, then divide the litres used by the kilometres travelled and multiply by 100 to calculate consumption in litres/100km

You could slap that into excel and start from there.

Like I said you'd need to do this over a few months with a few tanks. to see what the consumption is. Obviously if the car had the onboard MFA display you could tell from the car directly.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
MK1 Build Register: https://www.vwclub.co.za/forum/viewtopi ... 1&t=192835
Instagram: https://www.instagram.com/projectkirschwasser/

Racing is meant for the RACE track - deal with it...
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay cool I understand, I'll get the injector cleaner first and top up the tank.

Generally with my vehicles fuel economy, I'd need to fill the tank up every 2 weeks so after 6 to 8 weeks I think we should have an idea of how much petrol it's consuming.

Must I top it up till the airlock or till the autostop?

Till the airlock I can fill 49 litres and the auto stop I get about 36 litres.

And also must I fill up again till the fuel light comes on or till there's only one stick left on the fuel guage?



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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

I think those cars have a 45L tank. So full it till it’s full and drive it out till it’s empty.

The light comes on when there’s still 10L in the tank IIRC.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
MK1 Build Register: https://www.vwclub.co.za/forum/viewtopi ... 1&t=192835
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Racing is meant for the RACE track - deal with it...
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay thanks bud, I'll keep you updated on how's the fuel consumption going

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Re: 2008 1.4i polo 9n heavy on petrol

Post by VAG Fan »

How empty you drive the tank is really not all that critical. More petrol used translates to more kilometres covered. Anything around reserve (red zone on the gauge) is fine.

But what IS important, is that you stop the fill-up at the same point each time. Either use automatic click-stop consistently, or use full-to-the-brim consistently. Choose one, and stick with it.

I always go to the same filling station (because cheapest Diesel) and also try to use the same pump. I use the automatic kick-out, as I don't like brimming full fuel tanks.
Mark R.
- - - - - - - - - -
2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay I will do that and see how it goes

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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Do I put the injector cleaner before or after filling the tank?

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Re: 2008 1.4i polo 9n heavy on petrol

Post by VAG Fan »

It really doesn't matter all that much. Before filling up, gives it a better chance to mix with the petrol. But even after filling up is OK, because the fuel pump mixes the tank contents anyway, while the engine runs. See what the instructions on the bottle say.
Mark R.
- - - - - - - - - -
2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
- - - - - - - - - -
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

On the bottle it says suitable for up to 70 litres, does that mean I would have to use like half or 3 quarter of the bottle?

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VAG Fan
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Re: 2008 1.4i polo 9n heavy on petrol

Post by VAG Fan »

No, it just means it's not as effective if you use it in a larger tank (e.g. my Audi had an 80 L tank, so I always added any fuel system cleaners when the tank wasn't full, but only about half full).

You can add the full bottle to the tank, no problem. 45-60 L is a standard tank size, and that's what these bottles are normally made for.
Mark R.
- - - - - - - - - -
2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Goldwagen didn't stock the Wynn brand so I bough Liqui Moly

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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Okay got it, I'll use the whole bottle and fill the tank up

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Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

When you've used these cleaners, did you notice any difference on the performance of the vehicle ?

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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

Nope.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
MK1 Build Register: https://www.vwclub.co.za/forum/viewtopi ... 1&t=192835
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Racing is meant for the RACE track - deal with it...
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

I guess that's a good thing, could mean that the car is operating as it's supposed to

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Re: 2008 1.4i polo 9n heavy on petrol

Post by VAG Fan »

Neeven wrote: Fri Oct 01, 2021 5:31 pm When you've used these cleaners, did you notice any difference on the performance of the vehicle ?

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On older carburettors, to some extent, yes. On fuel injection, hardly. The various problems I've had with fuel injection systems were usually of a different nature.
Mark R.
- - - - - - - - - -
2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
- - - - - - - - - -
Neeven
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Re: 2008 1.4i polo 9n heavy on petrol

Post by Neeven »

Hi guys, I need to find out something for a friend. If a car was running on water only and if my friend decided he wanted to start running anti coolant on the car going forward. Will it cause problems?

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Re: 2008 1.4i polo 9n heavy on petrol

Post by EX-DOHCTOR »

Firstly, he should’ve been running antifreeze from the beginning.

Best he flush the water out and add G12 and top up with water.

Not sure which car but check the bottles for the correct coolant -water ratio.
2014 - VW Jetta 6 - 1.6 TDi DSG
2000 - VW Golf 3.5 Cabrio - 2.0
1980 - VW MK1 GT - 1.8 Carb - https://www.vwclub.co.za/forum/viewtopi ... 1&t=153861
1971 - Mitsubishi Colt 1100F - https://www.vwclub.co.za/forum/viewtopi ... 1&t=220503
MK1 Build Register: https://www.vwclub.co.za/forum/viewtopi ... 1&t=192835
Instagram: https://www.instagram.com/projectkirschwasser/

Racing is meant for the RACE track - deal with it...
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