Petrol and Car temprature display

[bouzel]

The car petrol needle goes mad all the time sometimes it says i got no petrol then goes up to quarter and just giving me the wrong reading most of the time, and the other needle the one that display the temprature doesn't even more just stays on cold which is unhelpful my friend works for audi just started told me it could be the sensor as they both work of one sensor, am i right in saying that? also where is this sensor any ideas would be appreciated
thanks
Anis

[r_penny23]

the other needle the one that display the temprature doesn't even more just stays on cold

Had the same problem on mine. Last year got my lambda sensor (think thats whats its called....) when my sensor was rising a falling erratically and that fixed it. This year I had it again but this time the sensor was dipping when moving but ok in traffic and on a trip to VW got the temperature sensor and thermostat change which helped. I also got my throttle body cleaned but that was because my tick-over was off (another issue I dont think was linked).

I drive like a complete ass most of the time so thought my fuel consumption was bad because of that but this year once I got the thermo done Im now getting close to 340 a tank which is nice

Think it was £120 for the thermo and throttle-body and they also cleaned the temp sensor.

[alexperkins]

Temp sender is really cheap to buy from VW, and if your confident in your own mechanics, you can quite easily do it yourself

In the first quarter from 1/1 to 3/4 on my guage, the reading is always way over the place, then itll suddently plummit lol

[Mouse_GTI]

My petrol guage is pretty crap and is very sensitive. Once the petrol light comes on though it sits bang on the start of the red line and stays there

[bouzel]

See the thing is i just started my car up this morning and it is definatley not running right, it's running really rough with power loss and feels shaky to drive, do you think it could be the sensors you mentioned above, i changed the spark plugs as they haven't been changed (full of oil on them though??), just installed the dual temp sensor today with no sucess so any ideas please

[r_penny23]

See the thing is i just started my car up this morning and it is definatley not running right, it's running really rough with power loss and feels shaky to drive, do you think it could be the sensors you mentioned above, i changed the spark plugs as they haven't been changed (full of oil on them though??), just installed the dual temp sensor today with no sucess so any ideas please

Maybe the mass airflow meter? I'd try cleaning the throttle body too but if it sounds like a bag of nails maybe look at the meter too:?

[bouzel]

Where is the mass airflow meter? also i cleaned the throttle body a little while ago, sprayed it with the carb cleaner, or can i clean it another way?
many thanks
Anis

[alexperkins]

Did you get someone else to rev the car on and off to bout 4k whilst you sprayed the cleaner into the TB (engine running of course)?

Only other thing it could be is perhaps a lambda sensor causing the mixture to run to rich or perhaps to lean. Its worth getting a vag com on it

[bouzel]

I don't have funds right now to get VAG COM done local volkswagen dealer charges £96 an hour went to a backstreet garage near me and its £63 both per hour, the sensor you mentioned alex where abouts is it, at the moment i disconnected the battery as i got told the fault could still be on the system and putting it in "limp mode"
many thanks
Anis

[alexperkins]

Its on the catalytic convertor before and after to be precise. Shame your not closer - I would happily connect it up and test it for you.