TT rough idle/running rich
Discussion
i've had a slightly rough idle for a while and am getting VAGCOM codes 17705 (thottle valve pressure loss/hose connection fault) and 17545 (running rich)
i've done a little research and found that a "dirty throttle body bire/control module" can cause rough idle. Is the throttle body the same as the MAF or should i get my mechanic to look at cleaning the throttle body and the MAF?
i'm guessing that this is probably why i'm getting the running rich code ??
i'm also getting strange howl/blowing noises from the engine. guessing this is the hose connection fault. the thing is, the noise seems to occur mostly on the overrun (when i lift off the throttle) so surely thats a DV fault? only thing is, i have a fairly new forge eliminator DV and i wouldnt expect that to be faulty ??
i've not had a remap (yet) so i'm pretty surprised that the turbo hoses and/or the DV have gone as they aren't under any particular extra pressure..
anyone any ideas what might be causing these problems?
i've done a little research and found that a "dirty throttle body bire/control module" can cause rough idle. Is the throttle body the same as the MAF or should i get my mechanic to look at cleaning the throttle body and the MAF?
i'm guessing that this is probably why i'm getting the running rich code ??
i'm also getting strange howl/blowing noises from the engine. guessing this is the hose connection fault. the thing is, the noise seems to occur mostly on the overrun (when i lift off the throttle) so surely thats a DV fault? only thing is, i have a fairly new forge eliminator DV and i wouldnt expect that to be faulty ??
i've not had a remap (yet) so i'm pretty surprised that the turbo hoses and/or the DV have gone as they aren't under any particular extra pressure..
anyone any ideas what might be causing these problems?
My money is on the hose that connects the intercooler pipe to the turbo inlet. Its a very common failure on the 1.8T
VAG-COM always suggests a DV or throttle body fault for 17705 but they are rarely the actual problem
Which engine is it ?
I'd be amazed if it was the DV but it could be that the fitter hasnt connected it propperly. The small hos ethat connects to the top of the DV is often a very tight fit on aftermarket valves.
VAG-COM always suggests a DV or throttle body fault for 17705 but they are rarely the actual problem
Which engine is it ?
I'd be amazed if it was the DV but it could be that the fitter hasnt connected it propperly. The small hos ethat connects to the top of the DV is often a very tight fit on aftermarket valves.
Edited by Goochie on Tuesday 21st November 14:58
) That is almost definitely a massive boost leak. That's why it's running rich, cos the air that the MAF says is going past it (which is right) isn't going into the engine, and is escaping through a leak in one of the charge pipes. I assume you still have the standard hoses, and there are weak, and can split where the hose clips are tightened or can blow off completely or somewhere in between the two.
If it audible over the engine, you shouldn't have to look to hard. Just rev it - when it's hot!! - while your mechanic listens for where it's coming from.
Easy fix and a good time to upgrade to Forge hoses! www.forgemotorsport.co.uk
Hope you get it fixed.
Cheers
Andy
If it audible over the engine, you shouldn't have to look to hard. Just rev it - when it's hot!! - while your mechanic listens for where it's coming from.
Easy fix and a good time to upgrade to Forge hoses! www.forgemotorsport.co.uk
Hope you get it fixed.
Cheers
Andy
The pipe I mention is a common failure as the seal at the join on the turbo side (the top) is pretty poor. VAG redesigned the seal and it is now a double lip seal rather than a single O ring type. 06A 145 790 C is the new part number.
If thats not the direct cause of your fault it is worth changing anyway as it is frequently the cause of random 17705 fault codes.
COst for the part is about £35 via your dealer.
If thats not the direct cause of your fault it is worth changing anyway as it is frequently the cause of random 17705 fault codes.
COst for the part is about £35 via your dealer.
You're very unlikey to find any splits as it is the seal inside the end of the pipe that fails. You wont see anything wron gwith the part once removed, either.
You cant see the pipe from the top of the engine.
Lying on your back under the engine, look up the back towards the turbo, where the exhaust goes. As you're lying under the car (assuming feet out the front) look to the right of the exhaust, you will see a pipe about 2" diameter that has a silver coloured fabric type heat sheild around it.
www.philgooch.com/PH/100_0265.jpg
On a Leon/Golf/Octavia there is a flat metal pipe that can easily be seen in the driver's side front wheel arch, the pipe you're looking for is attached to the top of that one - I assume the TT has the flat pipe in the same place, if not it will be on the inside of the arch liner.
You cant see the pipe from the top of the engine.
Lying on your back under the engine, look up the back towards the turbo, where the exhaust goes. As you're lying under the car (assuming feet out the front) look to the right of the exhaust, you will see a pipe about 2" diameter that has a silver coloured fabric type heat sheild around it.
www.philgooch.com/PH/100_0265.jpg
On a Leon/Golf/Octavia there is a flat metal pipe that can easily be seen in the driver's side front wheel arch, the pipe you're looking for is attached to the top of that one - I assume the TT has the flat pipe in the same place, if not it will be on the inside of the arch liner.
Edited by Goochie on Thursday 23 November 09:35
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