Hi all please please please can someone help me I really don’t wanna sell this car but I recently bought a 2009 Audi a3 1.8tfsi and it occasionally starts stalling and revving by its self I have replaced the throttle body and the pedal with the throttle position sensors but still no job iv also has a play with the inlet manifold and still nothing please can someone help me the epc light used to come on with check engine but now no more light since wipes the codes but it still does the problem 

Has the car been modified in any way, or remapped?

I suggest you get diagnostic scan on a professional machine, the cheap DIY readers are inadequate for a thorough anaysis.

Thank you so much for your reply My grandad has his own workshop so we’ve tried and tried still coming up with throttle Acuator or something but yeah it’s been remapped before my ownership 

Remapping has made it much harder to diagnose the faults. If a proper diagnosis does not lead to a fix, all I can suggest is to restore the original map and hope for the best.

Thank you mate

 

Could it be an issue with the maf sensor? 

Have you changed the actuator? 

Hiya buddy nothing about maf is coming up on obd

Just trying to think of issues regarding the air/fuel mixture. 

Have you changed the actuator? 

No I havnt where is it located ? Would you know?

14 minutes ago, Rhys1234 said:

No I havnt where is it located ? Would you know?

 Ot sure to be honest. But if the fault code is that then I'd look to inspect it and replace it. 

Alright thank you 

Please keep us posted on how you get on 

Will do thanks buddy 

No probs at all 🙂 

On 7/25/2025 at 6:16 PM, cliffcoggin said:

Remapping has made it much harder to diagnose the faults. If a proper diagnosis does not lead to a fix, all I can suggest is to restore the original map and hope for the best.

Any update here?

1 hour ago, Lolos A6 said:

Any update here?

It's Rhys you need to be asking, not me, and he has not returned to the forum for two months.

Ok cliff calm down!

Hiya, Yesh I did manage to fix it completed forgot about this forum though and it ended up being an aftermarket throttle body that was the problem garage put on an oem one, coded it in and bee running a dream for a while now sorry for late reply 

8 minutes ago, Rhys1234 said:

Hiya, Yesh I did manage to fix it completed forgot about this forum though and it ended up being an aftermarket throttle body that was the problem garage put on an oem one, coded it in and bee running a dream for a while now sorry for late reply 

Thanks Rhys, I’ll pass this onto my mechanic just in case. Nightmare trying to figure this stuff out. 

3 hours ago, Lolos A6 said:

Thanks Rhys, I’ll pass this onto my mechanic just in case. Nightmare trying to figure this stuff out. 

Cannot see the point in using an A3 petrol throttle body as a bench mark against an A6 diesel ultra, your throttle body is on the inlet manifold at the end right next to the EGR and both are water cooled, his vehicle on the other hand has a throttle boy under the inlet manifold which has no water cooling and runs on a completely different system, ergo the chances of you having a cheap aftermarket unit fitted are non existent as all the throttle bodies for the Ultra system whatever make have been used as O.E. at some point and my one only failed at around 200k.

Steve.

Yeah no worries however like Stevey says They are 2 different cars with 2 different engines running off 2 different fuels so there solutions will not likely be the same as there could be a million issues in between the two of them and my car/engine hates aftermarket part's but yeah I hope you find the problem, good luck mate 👊👍

5 hours ago, Rhys1234 said:

Hiya, Yesh I did manage to fix it completed forgot about this forum though and it ended up being an aftermarket throttle body that was the problem garage put on an oem one, coded it in and bee running a dream for a while now sorry for late reply 

 

1 hour ago, Stevey Y said:

Cannot see the point in using an A3 petrol throttle body as a bench mark against an A6 diesel ultra, your throttle body is on the inlet manifold at the end right next to the EGR and both are water cooled, his vehicle on the other hand has a throttle boy under the inlet manifold which has no water cooling and runs on a completely different system, ergo the chances of you having a cheap aftermarket unit fitted are non existent as all the throttle bodies for the Ultra system whatever make have been used as O.E. at some point and my one only failed at around 200k.

Steve.

Hi Steve

Ive Literally commented on the very few posts that coincided with similar issues I'm having with my car. Trying to figure it out here as mine showing zero faults with plugged into computer. Feel free to pass on your expertise 

21 hours ago, Lolos A6 said:

 

Hi Steve

Ive Literally commented on the very few posts that coincided with similar issues I'm having with my car. Trying to figure it out here as mine showing zero faults with plugged into computer. Feel free to pass on your expertise 

Hi simply couldn't comment on your situation as I seem to remember you quoting it had a remap therefore the the variables problem wise are immense as it has been taken out of the manufacturers as built scope of fault register unless you have someone who understands live data you are stuck the only clue I can give you is that if this occurred after a cam belt change, the cam timing could well be out or the crank position sensor is shot which could be checked on live data but the belt is mechanical which would involve stripping it back and checking the timing marks are spot on.

Its a !Removed! nightmare! Anytime I drive over a ramp it acts up also which leads me to believe its a loose connection somewhere but where 🙈.

 

Hoping for some kind of miracle at this stage, could be anything.

Thanks for feedback

2 hours ago, Lolos A6 said:

Its a !Removed! nightmare! Anytime I drive over a ramp it acts up also which leads me to believe its a loose connection somewhere but where 🙈.

 

Hoping for some kind of miracle at this stage, could be anything.

Thanks for feedback

Hi if you get the car test driven whilst plugged in they should in theory drive over a ramp and if all the ignition and injection feeds are on graph and logging, you should then be able to watch it when its returned to see which circuits bumped when you crossed the ramp.

Steve.