Polo tdi high idle issue... going to Hatfield Thursday :)

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Re: Polo tdi higher idle issue...

Post by SoDub »

Ok got called right now as i posted the last reply! The Service advisor told me he is a mechanic and apparently my tdi does have a throttle body!? Its ordered and will arrive in a few days... Maybe its the inlet mainfold or EGR and he calls it a throttle body? Will collect the car and take it in when its at the dealer. They said after all the testing they have done this is the only part left that probably is the cause of the occasional higher idle.. Its a small issue but it shouldnt be happening at all... Havent seen G60 on lately maybe I will PM him and ask him what he thinks?
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Re: Polo tdi higher idle issue...

Post by Neuk »

veedubbed wrote:Ok got called right now as i posted the last reply! The Service advisor told me he is a mechanic and apparently my tdi does have a throttle body!? Its ordered and will arrive in a few days... Maybe its the inlet mainfold or EGR and he calls it a throttle body? Will collect the car and take it in when its at the dealer. They said after all the testing they have done this is the only part left that probably is the cause of the occasional higher idle.. Its a small issue but it shouldnt be happening at all... Havent seen G60 on lately maybe I will PM him and ask him what he thinks?
Interesting, a mechanic who actually has no clue what he is talking about :crazy: TDi's don't run throttle bodies, hence them using a shut-off valve to block the intake momentarily when switching the engine off...

...I'd ask for an explanation...
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Re: Polo tdi higher idle issue...

Post by SoDub »

Picked the car up... Correct me if I'm wrong, in my layman terms - according to VW there is a "throttle body" that forms part of the intake manifold. Apparently theres a flap that controls the idle and this is where the fault is coming in. They also noticed it only happens when the engine is hot. Apparently the whole part is **** expensive and kudo's factory warantee- it will take a few days to arrive!!! Hopefully this will sort the idle out as they have exhausted all other possible sources. Will keep the forum up to date if this solves the issue!
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Re: Polo tdi higher idle issue...

Post by Neuk »

veedubbed wrote:Picked the car up... Correct me if I'm wrong, in my layman terms - according to VW there is a "throttle body" that forms part of the intake manifold. Apparently theres a flap that controls the idle and this is where the fault is coming in. They also noticed it only happens when the engine is hot. Apparently the whole part is s**t expensive and kudo's factory warantee- it will take a few days to arrive!!! Hopefully this will sort the idle out as they have exhausted all other possible sources. Will keep the forum up to date if this solves the issue!
There may be an idle stabilisation valve, but there is no throttle body in your TDi :wink: Diesels work very differently to petrols, in that rpm is dictated by fueling whereas in a petrol airflow is used and fueling is adjusted. For example in a TDi the accelerator is linked to fuelling via the injectors, whereas in a petrol it is linked to airflow via the throttle body...
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Re: Polo tdi higher idle issue...

Post by ree1 »

I always thought the idle goes up when it builds oil pressure.lol.

Devzo i had that problem on my corsa.it was some earth problem
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Re: Polo tdi higher idle issue...

Post by SoDub »

One thing I have noticed... On cold mornings when I start the car up it does not keep the revs above 1000 for like 10 seconds to warm up. It used to when I bought it. My car sleeps outside and during these passed few cold mornings I noticed it starts up and idles at the regular revs right away. I think it has done this for quite a while and never noticed! Maybe something got reversed as it idles at 1000 when hot not cold hehehe
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Re: Polo tdi higher idle issue...

Post by kripstoe »

veedubbed wrote:One thing I have noticed... On cold mornings when I start the car up it does not keep the revs above 1000 for like 10 seconds to warm up. It used to when I bought it.
I don't think it's supposed to rev above 1000 on startup for a couple of seconds, even when cold.
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Re: Polo tdi higher idle issue...

Post by devZo »

mine is the oppposite...it only seems to start like that, when the car has been sitting in the heat...keep us posted-i need to tell the guys at vw exactly what to look for :geek:
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

So I got a call from Vw... Apparently they changed the "throttle body" and guess what? Car is still doing the odd 1000 rev idle... Service advisor said they are stumped and the car is being inspected by the auto electrical dept. This is starting to worry me as I hope they know what they are doing :( I should have taken the car to hatfield and let G60 and the team sort it out like the turbo!!!
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by MK2 G60 »

There is no t.b on tdi only shut off valve mechanical on most tdi polo's electrical on seat and mk5 etc.The only polo that came elect was the last 1.4tdi's.

The only car that idels high on start up for a bit is the seat's the polo will idel at about 900rpm and on some occations at 1000rpm but very short time.

For high idel there could be a number of reasons.Leaking injectors incorrect idel adjustment through ecu as it can be adjusted on some ecu's with a code.Extra un meterd air etc etc etc.
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by Sinbad »

I wonder if it's oil related. A TDI can burn engine oil as fuel... maybe some oil getting in where it shouldn't?
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by P-GTi »

What engine code is the 96kw tdi sportline?
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by P-GTi »

Just an idea.

"Air conditioner compressor ready:
The air conditioner switch sends Diesel
Direct Fuel Injection Engine Control Module
J248 a signal indicating that the air
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the engine idle speed before the air
conditioner compressor is switched on to
prevent a sharp drop in engine speed when
the compressor starts up."
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

Thanks guys... Thanks G60. Im awaiting the result from them today. If they cant sort it I will be booking it in with Hatfield!
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by devZo »

oh boy...i have no hope :bang: ....
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by Neuk »

g60 golf wrote:There is no t.b on tdi only shut off valve mechanical on most tdi polo's electrical on seat and mk5 etc.The only polo that came elect was the last 1.4tdi's.
O RLY :crazy: Veedubbed - Now go tell your dealership to stick their snotty attitude up their arse :crazy: And to stop feeding a customer ****...

I suggest getting the car to Morne at Hatfield VW Brysnaton to have a look...

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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

Going to this afternoon Neuk! The thing that irritated me is the service advisor actually told me yesterday "we dont know" "we cant come right". Rule in business is not to tell the client you have no idea as they will doubt your ability! No offer of a courtesy car either but rather a " the car will need to stay here for further testing". If its not sorted this afternoon I will collect the car and take it in to Morne @ Bryanston Hatfield. I regret not taking it there in the first place as I thought it was something small and the local dealership could sort it out quickly.
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by Neuk »

veedubbed wrote:Going to this afternoon Neuk! The thing that irritated me is the service advisor actually told me yesterday "we dont know" "we cant come right". Rule in business is not to tell the client you have no idea as they will doubt your ability! No offer of a courtesy car either but rather a " the car will need to stay here for further testing". If its not sorted this afternoon I will collect the car and take it in to Morne @ Bryanston Hatfield. I regret not taking it there in the first place as I thought it was something small and the local dealership could sort it out quickly.
Cool bud, sorry for the rant, I just hate this attitude that some dealerships have that customers are mindless idiots that know nothing about cars, so they just feed us crap and expect us to believe them :crazy: I have had many "arguments" like this where I have corrected them...

Morne is a legend, you won't regret it...

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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

No worried Neuk! Im getting peeved holy now! I collected the car this afternoon as I need it to go to a function tonight(as they do not offer a courtesy car at all). I arrive there and ask the S.A what was changed on the car as they said they have identified a problem and he can't tell me what it was because A. He didn't know exactly what the technician was talking about and B. The technician has gone home already. Now I must take my car back in tommorow morning because they and I quote " didnt even wash it". I dont care about a wash as long as the car drives normal!

Now the best part... I climb in and drive out the dealer and the car goes back to 1000 revs again. At the next robot I switch it off and on and it now sits on a low 800 revs. Feels like I'm driving a harley with ancient springs as im jiggling around. So not only have they not fixed the problem - they have managed to eff it up worse! Tommorow I'm going to the service manager and I am demanding a detailed printout of what they have tampered with. They must return the car to its 900 idle! I will then book the car in with Morne. Im tired of driving up and down! aaaargh!
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

So I arrived at the dealer this morning... I asked to speak to the service manager. He had a look at my car and called the advisor. Advisor tells him that the car was not finished yet and they gave it back to me to use for the night. My dad was with me and kinda lost it more than me arguing 6 days at a dealer and still nothing. The service manager said he would look after the car personally and deal with the technician. I told them today is the last day and I am taking it to another dealer if it is not sorted.

EDIT: It is 4:30pm phoned them and my car is "errr we cant get it right still." I am then told the service manager will not release the car unless it is resolved, and he is busy with a client now so I cant' speak to him and there are no cars to loan you either. Oh well I'm on my way to them now and I'm going to collect my car and send it to another dealer. Will keep posted on whats happening - this dealer has gone down the tubes! - My car, my dads and the SO's car will not go there ever again...
Last edited by SoDub on Fri Nov 27, 2009 4:41 pm, edited 1 time in total.
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by kripstoe »

I would complain with VW HQ...
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

Dear Diary: I went and fetched my car, staff was very polite as there were clients around but asked if I would be taking the car elsewhere. I said you bet your 2 left thumbs i am :)

Going to phone and book it into hatfield.(Note to self: Should have done this in the first place) Until then I have my low idling, sometime high idling sooter home for the weekend.
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by Neuk »

I am sure Morne will be able to help you out :wink: At least he knows there is no TB on a TDi :crazy:
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Re: Polo tdi higher idle issue... Vw dealership stumped :(

Post by SoDub »

Car is booked for thursday morning at Hatfield. I hope its nothing major :)
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by OettingerTDi »

Just a thought...

My Jetta had a fast idle problem too, but at around 1200 r/min. It would happen at rondom, but particularly at start, but got worse to include hot starts too. It would burst into life with a cloud of soot and idle at 1200. With the Oettinger computer, pulling off and going round traffic circles was particularly interesting. :grin:

Turned out to be a faulty water temperature switch. The guage did not read 90 degrees as normal, slightly below. If you started the car at anything below a reading of 90 degrees, it idled at 1200.
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