Loss of power after new water temp sensor?
Discussion
Hi guys,
I've recently been for a remap on my A3 1.8T Engine code AGU. When it was at the company (R-Tech), they noticed it had a faulty water temperature sensor before remapping. They remapped it anyway, but obviously advised that I had it replaced.
Yesterday I got it back from my local garage. It's had a new water temp sensor fitted, but it feels slightly 'weaker' than before. I can't tell whether it's the humid weather we've had in England the past few days, my imagination or it is actually slower (or a mixture haha)
What I'm hoping you guys will know is whether or not the new water temp sensor is regulating differently to the faulty one that was on before, therefore affecting the car's performance? Obviously the remap was installed when the car had the faulty sensor, and now a new one has been fitted, would it have a negative affect on the remap, or perhaps mean the remap won't work as well with the new sensor as it did with the old faulty sensor?
I've recently been for a remap on my A3 1.8T Engine code AGU. When it was at the company (R-Tech), they noticed it had a faulty water temperature sensor before remapping. They remapped it anyway, but obviously advised that I had it replaced.
Yesterday I got it back from my local garage. It's had a new water temp sensor fitted, but it feels slightly 'weaker' than before. I can't tell whether it's the humid weather we've had in England the past few days, my imagination or it is actually slower (or a mixture haha)
What I'm hoping you guys will know is whether or not the new water temp sensor is regulating differently to the faulty one that was on before, therefore affecting the car's performance? Obviously the remap was installed when the car had the faulty sensor, and now a new one has been fitted, would it have a negative affect on the remap, or perhaps mean the remap won't work as well with the new sensor as it did with the old faulty sensor?
If this was the temp sensor that supplies the ECU I can't understand why they carried on after detecting a fault without bothering to sort the problem. Doesn't fill you with confidence as to their ability.
Personal experience of water temp sensor failure was an initial cutting out when at idle & increased fuel consumption. As this was an intermittent fault diagnostics failed to pick it up. Finally full failure prevented the car starting when hot. When the sensor failed, the ECU thought the car was cold & fuelled accordingly, but as the engine was hot it flooded it.
Personal experience of water temp sensor failure was an initial cutting out when at idle & increased fuel consumption. As this was an intermittent fault diagnostics failed to pick it up. Finally full failure prevented the car starting when hot. When the sensor failed, the ECU thought the car was cold & fuelled accordingly, but as the engine was hot it flooded it.
Edited by paintman on Saturday 30th June 22:38
paintman said:
If this was the temp sensor that supplies the ECU I can't understand why they carried on after detecting a fault without bothering to sort the problem. Doesn't fill you with confidence as to their ability.
Personal experience of water temp sensor failure was an initial cutting out when at idle & increased fuel consumption. As this was an intermittent fault diagnostics failed to pick it up. Finally full failure prevented the car starting when hot. When the sensor failed, the ECU thought the car was cold & fuelled accordingly, but as the engine was hot it flooded it.
Yes. I'm not all that pleased that they continued with the remap without telling me. When I dropped the car off, I said "I'll go for a walk while you do it". They said "yes no problem, we've got your mobile number we'll give you a call if there are any problems".....but when I returned it was all finished albeit completed with a faulty sensor?? mmmPersonal experience of water temp sensor failure was an initial cutting out when at idle & increased fuel consumption. As this was an intermittent fault diagnostics failed to pick it up. Finally full failure prevented the car starting when hot. When the sensor failed, the ECU thought the car was cold & fuelled accordingly, but as the engine was hot it flooded it.
Edited by paintman on Saturday 30th June 22:38
Shall ring them tomorrow!
I would definitely be on the blower to them, why would they continue if they picked up on a sensor failure which would cause problems. Anyway, an 1.8T blowing sensors? Whatever next, flying pigs? 
It might be a coincidence, or as a result of moving things around to fit a new water temp sensor, but I'd have a good look under the bonnet for any split or unhooked hoses from the air intake system. It's a real rat's nest under there, the main turbo intake pipe (TIP) has 5 breathers hoses coming off it, and there is pipework going everywhere. Have a look for splits or leaks - these blow wide open as boost builds and effectively bleed all the extra air out the car needs to boost properly. Similarly, if any hoses are not connected, the car will feel flat as a witch's tit when you try and get boost. Make sure all the jubilee clips on the hoses are tight too.
When I had my Cupra R modded to 270bhp, I had a new TIP fitted as the standard is prone to collapsing shut under boost, and while it might not be a problem on a lower powered Audi with the same engine, the standard item is pretty flimsy tbh.
It might be a coincidence, or as a result of moving things around to fit a new water temp sensor, but I'd have a good look under the bonnet for any split or unhooked hoses from the air intake system. It's a real rat's nest under there, the main turbo intake pipe (TIP) has 5 breathers hoses coming off it, and there is pipework going everywhere. Have a look for splits or leaks - these blow wide open as boost builds and effectively bleed all the extra air out the car needs to boost properly. Similarly, if any hoses are not connected, the car will feel flat as a witch's tit when you try and get boost. Make sure all the jubilee clips on the hoses are tight too.
When I had my Cupra R modded to 270bhp, I had a new TIP fitted as the standard is prone to collapsing shut under boost, and while it might not be a problem on a lower powered Audi with the same engine, the standard item is pretty flimsy tbh.
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