A5 MISSFIRE PLEASE HELP!!

[matthew45]

I have had intermittent problems with my A5 for about a year on and off now had coil packs changed but still on and off jumps like mad and missfires but NO codes come up...

Jumps all the way to until the engine is warm approx 10-15 min then absolutely fine

Can anybody shed any light on this is it common problem with this A5 ??? 2009   2.0

Many thanks

Matthew

UK

[Trevor]

Hi Matthew....welcome to the Forum

It sounds like a coolant temperature sensor or the connection to it.

Worth checking the live data for the sensor and see if it fluctuates....worse case scenario, replace it to eliminate it....there not too expensive!

Let us know how you get on with this problem

Cheers  Trevor

[matthew45]

Thanks Trevor its being looked at as we speak the sensor is £45+ vat fingers crossed thanks for your advice much appreciated.

 

Matthew

[matthew45]

i also have a very annoying boot squeek, took wheel out etc but i think its down the side in boot any experience on this??

 

thanks

matthew

[matthew45]

Hi trevor

 

since the mentioned Temp coolant sensor was fitted i took the car about 200 miles saturday and when i stopped it leaked all the coolant out now its empty the sensor flashed up on the dash board the red temp sign and the temp gauge hit 100+

 

any thoughts???

 

thanks

matt

[Trevor]

oh dear!  either the sensor wasn't fitted correctly and it's lost it's seal or similar or it's got an air lock and the coolant has belched out from the expansion tank/bottle and just needs topping up. Either way I would take it back and get them to sort it, especially if it wasn't doing it beforehand

[matthew45]

Hi Trevor

The car has been ok for about a few days ive done about 300 miles in it then the other day re started it after using it earlier in day and it started spluttering again

i am starting to lose my patience with this issue now....

 

Coil packs changed

Coolant Temp sensor changed

breather valve changed

 

Any other suggestions??? Carbon build up?? Filter block

 

Im at my wits end now i have been trying to get this car sorted and 18 mths later and about 2.5k spent...

 

Its a 2009 A5 2.0 TFSI  REG YC09 0VP

 

Regards

 

Matthew

[Magnet]

Hello Mathew,

Was the coolant temperature sensor a main dealer part?

Kind regards,

Gareth.

[matthew45]

I'm not sure why?