When I start my vRS, after approx 5 - 6 secs the idle rises from 850 rpm up to 1000 rpm. If I sit still and leave it for a bit (maybe a minute or two), and blip the throttle, then the idle will drop back down to 850 rpm. I usually just drive away once I have started up and carry on as normal and within a few minutes or my first stop due to give way/traffic light it has dropped back to its normal idle. Has anyone else experienced this? The car is an '07 plate, has just clicked over 27k (last night), and has had its throttle pedal replaced on warranty at approx 20k miles. This was done by previous owner. Has anyone else seen this before? Also when the revs rise to 1000 rpm, I can hear the turbo whistle slightly - is this normal?

Once the car is warm it does not do this (it can just be a lumpy b*gger then!), it only happens from a cold start. Any info or advice gratefully received as ever.

Lewwy

That is normal.. maybe somebody could explain in more detail

From a cold start a car idles higher its part of the warm up period, the older cars would have a chok that old folk would pull to give more fuel and air to the engine and once its warmed up they would push the chok back in, same principal just that the ECU is doing it for you.

You shouldnt leave a car idling from a cold start for any longer than necessary because the warm up period is critical start driving ASAP to get the oil circulating in the engine and it will warm up itself obviously be gentle on the pedal until its reached its normal operating temp.. Dont know if its true or not but you cause more wear on the engine during start up because the internals are under stress low oil pressure causes friction in return causing more engine wear, the oil needs to circulate the only way it will circualte is if its driven as its warmed up the oil gets thiner.

Hope im making sense

The thing is I have previously owned a Bora TDi Sport, my Mrs's currently has a Beetle TDi, and my Dad has a Seat Altea Reference Sport TDi, all of these have the 1.9 TDi all be it different engine tunes (115bhp, 100bhp, & 105 bhp) and none of these do or ever have acted in this way when they are cold. The vRS idles at a normal 850 rpm when it first starts and it is a good few seconds delay before it then suddenly jumps up on its revs. Thats why it doesnt seem right. Like I say have owned/driven several 1.9TDi engined cars and none of these has done this.

I see what you are saying about driving the car and not sitting idling, even so the oil will still be circulating around the engine at idle, but like you say the car will warm up a lot faster if being driven.

Are you starting the car with the aircon on?!

This does not seem normal for a diesel (and I've owned or driven a fair few of a whole variety of different makes, models, engines and engine tunes of diesel in my time).

Also I don't think it's linked to the air, because my Octy has Climate and I just leave it in full auto mode without this happening.

I'd guess at something not quite right in the Furbie's cold start throttle setup.

I think it's normal. The previous owner of my VRS changed the throttle and when cold the revs do rise slightly. I've had the car 2 years and never had a problem engine wise.

This does not seem normal for a diesel (and I've owned or driven a fair few of a whole variety of different makes, models, engines and engine tunes of diesel in my time).

Also I don't think it's linked to the air, because my Octy has Climate and I just leave it in full auto mode without this happening.

I'd guess at something not quite right in the Furbie's cold start throttle setup.

No, not starting with the A/C on, always turn that and the blowers off before I stop the car. I agree with you Ken its not normal for a diesel to do this. I have owned a few diesels (not all VAG), and driven many others (I work for a big vehicle research and development prototype test house), and I can drive 4 or 5 different cars in any day.

I figure that it must be something wrong with the cold start set up, but with the BLT engine and its EURO IV rating possibly making a bit more complex than some of the older TDi's, I was wondering if anyone else had experienced it or knew what it was or why it is doing it, and therefore if anything can be done to stop it doing it.

I understand that there are a few issues with the BLT engine, and my engine suffers very regularly from a terribly lumpy idle - which is something else I have never suffered in any diesel vehicle before.

Apart from its decent power output its seems to be an engine that has a few niggling issues not seen on the ASZ. Any info appreciated

Check all vacuum hoses for leaks and or perished rubber, also check the brake servo vacuum line. Lumpy idle is not right. You may have a vacuum leak, slight intake system air leak, or faulty EGR valve. Most likely the EGR plunger is not closing fully.

Check all vacuum hoses for leaks and or perished rubber, also check the brake servo vacuum line. Lumpy idle is not right. You may have a vacuum leak, slight intake system air leak, or faulty EGR valve. Most likely the EGR plunger is not closing fully.

I agree that a lumpy idle is not right but I dont think I am the only person to have this problem as other people have mentioned it before on the BLT engine. I am beginning to think that VAG have made a right dogs dinner of the 1.9 TDi engine in this BLT form attempting to meet stupid EURO IV levels. I have never driven a diesel before with a lumpy idle.

I will have to investgate this vacuum leak idea. I can hear a whistle from the turbo when the revs raise themselves to 1000rpm at idle during this starting issue. I have also noticed that I can hear the turbo whistling at a fairly low rpm when in normal driving. Is this normal? Ive not noticed this in my Bora or the Mrs's Beetle, I wouldnt expect to hear the turbo spool up until higher rpm. At what rpm does the turbo start to spin up? and would you expect to hear whistling at such a low engine rpm as I am hearing?

I have done the 9mm gasket mod on the EGR which did greatly improve the smoothness of the car over the 1200rpm - 2000rpm range, as before it was a joke it was only ASZ engined vRS's that I had driven before mine and on the test drive mine felt sweet, only after a few days did i realise how bad it was with the hesitation/stutter.

Although I do still get some unsmoothness in it at times, and for a diesel engined car and compared with any VAG diesel I have driven before I still find it hard to drive smoothly at times at low engine/road speeds, can be unsmooth/jerky. I find this a real dissapointment and takes the shine off the car a little for me.

Are the EGR's prone for problems on the BLT engine? The one on our Beetle has the diapraghm playing up but that has 56k on it and I would have hoped at 27k the vRS one would still be in good functioning order. Would the EGR valve plunger not shutting affect the idle though?

Many Thanks for your responses/suggestions and ideas

Lewwy

hi. i have the same problem with raising idle speed after i turn on the engine. but mine raises the rpms all the time, doesn't matter it is cold engine or on working temperature.

diagnostic don't given any faults, water temperature sensor is ok

do you solved that problem??

i have closed the egr but still rpm's raises up after start

does it drop back to normal revs when you pull back on the pedal if so sticky pedal again

A faster than normal idle on startup is perfectly normal on all cars (petrol and diesel), it is basically an automatic choke, a lot of you young'uns won't remember having to pull a manual choke out to start the car and run it for the first few minutes of a journey, ah that takes me back to the good old days...

An overly lumpy idle is not normal and likely means that there is a problem with air supply/fuel supply/spark plugs etc.

Edited 19 June, 201214 yr by SkodaFabiaOwner

does it drop back to normal revs when you pull back on the pedal if so sticky pedal again

Yes. it drops back after aprox. 1-2 or 3 minutes or after a few presses of pedal

Engine is tdi, pd, 1.9 130ks... Exactly the same si****ion as is in first post in this thread

Interesting comments on faster idle at start up as neither of our Tdi's does this - the Fabia 1.9TDi starts and then is rock solid at about 800rpm regardless of temperature (hot or below freezing), as is the Octavia, a 2.0 TDi.

My Mazda, on the other hand does vary but then that is petrol.

I'd suspect an intermitent fault on the temperature sensor - that was what the cause of my strange starting and idling problem was.

Do you have a longer glow plug sequence before starting as well as the unusual idle?

""Do you have a longer glow plug sequence before starting as well as the unusual idle?""

do you mean engine heaters bulb? that bulb normally stop glowing very fast after turning a key

Edited 19 June, 201214 yr by Jandro

Yes. it drops back after aprox. 1-2 or 3 minutes or after a few presses of pedal

Engine is tdi, pd, 1.9 130ks... Exactly the same si****ion as is in first post in this thread

dont touch anything on start up then reach down with your hand and pull back if it drops back to normal then needs a new pedal

hmm... interesting i will try that tomorow

""Do you have a longer glow plug sequence before starting as well as the unusual idle?""

do you mean engine heaters bulb? that bulb normally stop glowing very fast after turning a key

Yes that is wat I meant - when I had a problem that bulb would occasionally be on for much longer than usual.

My 07 se does exactly whats described in post 1,when i first noticed it i checked all the obvious stuff but found nothing so i just give it a damn good ignoring!

My previous 56 plate vrs,also blt,never did it.

My 07 se does exactly whats described in post 1,when i first noticed it i checked all the obvious stuff but found nothing so i just give it a damn good ignoring!

My previous 56 plate vrs,also blt,never did it.

and you drive like that all the time??

fuel compustion? it is bigger like mine, or normal?

dont touch anything on start up then reach down with your hand and pull back if it drops back to normal then needs a new pedal

pedal is ok

My 07 BLT VRS does everything apart from the lumpy idle that the OP has described.

My car is standard and runs perfectly, I think it's just the auto choke on the ECU, as upon starting the engine when its already warm, it will idle at 850rpm.