MK5 TDI Idling high

[nissman]

Hi all. Was wondering if some people on this forum may be able to help me out. I drive a MK5 golf TDI 2lt with BKD engine and a couple of weeks ago it has started to idle higher than usual. It now idles at around 980rpm when usually it was around 800. Does anyone know what might be wrong or point me in the right direction?

Regards

Simon

[Transporter]

Jmac can help you with that here is his contact View Profile: Jmac - VWWatercooled Australia (http://www.vwwatercooled.org.au/forums/members/jmac/) :)

[davidno64]

My understanding. This is a micro regeneration for the DPF filter (as advised by VW at a service).
Usally a dash warnig comes up for a major regen but you can also get minor regens.
Idles at about/under 1000 RPM and then will return to normal in a short time.

[nissman]

My understanding. This is a micro regeneration for the DPF filter (as advised by VW at a service).
Usally a dash warnig comes up for a major regen but you can also get minor regens.
Idles at about/under 1000 RPM and then will return to normal in a short time.
I thought only the sport diesel had a DPF and didn't think the BKD had one. Mines got the 104kw engine. Where can I look to see if it has a DPF?

Regards

Simon

[Transporter]

I thought only the sport diesel had a DPF and didn't think the BKD had one. Mines got the 104kw engine. Where can I look to see if it has a DPF?

Regards

Simon

You have no DPF in yours. How many kms have you done?

[nissman]

Have done 66000km?

[Transporter]

The first step is to get it scanned with VCDS or similar. The fastest and usually the most economical way is to have a mechanic look at it. Jmac is your good option, he has a lot of experience. It's hard to diagnose the car over the internet. :)

[davidno64]

My understanding. This is a micro regeneration for the DPF filter (as advised by VW at a service).
Usally a dash warnig comes up for a major regen but you can also get minor regens.
Idles at about/under 1000 RPM and then will return to normal in a short time.

OOPs, you guys are correct. Got DPF on my mind at the moment, with my issues.
This car should not have a DPF!

[nissman]

Just some extra information. The car still drives ok with no lack of power and still great fuel economy, it just idles high for some reason? Could it be the EGR dirty and sticking maybe?

[Greg Roles]

Yep, pretty likely. My TDI idles high from time to time without doing a regen, but I have messed with the engine so much, it could be anything. It is never an issue, but I your case I would put it down to the EGR, causes a lot of weird problems, gums up flaps, have you ever spray cleaned it out with intake cleaner?

[jamie88]

i had this problem, scanned it and it was the intake manifold flap. replaced it with a new one from the uk $300 not $800 that local vw wanted to charge. and haven't had a problem since.

[Greg Roles]

Caused by EGR/ blowby buildup. Shame you have decided to remove the Provent, will happen again eventually!

[jamie88]

the egr and manifold flap have always been clean in my car, egr is coded out by revo, and the engine has little blowby. my manifold flap failed internally, a gear slipped and threaded itself. the intake manifold has never been cleaned and is virtually spotless too.

[Greg Roles]

Ahh coding out the EGR was a good move. As you dont have a DPF you can get by without a Provent, I'll leave you alone. I am getting Viezu to code down the EGR in any diesel tunes I do.

[jamie88]

yeah when the tuner asked i told him i definitely wanted egr coded out. such a good move. and no dpf, I'm one of the lucky ones ! no further mods needed haha!

[asa572]

yeah when the tuner asked i told him i definitely wanted egr coded out. such a good move. and no dpf, I'm one of the lucky ones ! no further mods needed haha!

Tell me more about getting the EGR coded out please!

[nissman]

Yep, pretty likely. My TDI idles high from time to time without doing a regen, but I have messed with the engine so much, it could be anything. It is never an issue, but I your case I would put it down to the EGR, causes a lot of weird problems, gums up flaps, have you ever spray cleaned it out with intake cleaner?

Haven't tried spraying intake cleaner. I was thinking of pulling it apart and cleaning it out though. Anyone have any tips on this any hidden screws etc.

Regards

Simon

[jazd]

yeah when the tuner asked i told him i definitely wanted egr coded out. such a good move. and no dpf, I'm one of the lucky ones ! no further mods needed haha!

So ****ing over my DPF. Bloody light came on again today.

[jamie88]

from what i understand about getting it coded out it was just a box they tickd while doing the revo tune. not sure about other tuners but its very possible as revo arent a HUGE name.
how do you spray inlet cleaner guys,
do you take the boost hose off the inlet flap motor and just squirt a bit in?
or do you spray it up the top just after the map at that inlet?

[nissman]

Have taken apart the egr/intake flap assembly today to check it. Found it to be much cleaner than expected. I cleaned it wit a bit of wd40 I had handy and an air hose. The intake flap was checked by hand and moves freely from open to close. After reinstalling I checked whether the Intake flap is closing when ignition is turned on. I found it was only moving about 3mm when cycling between on and off.
Can anyone tell me whether this is normal?? When the ignition is set to the on position(but not started) should the flap "completely" close, or only move a little bit like it is doing??

http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1290-1.jpg
http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1293-1.jpg
http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1291-1.jpg
http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1294-1.jpg

http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1297-1.jpg
http://www.vwwatercooled.com.au/forums/images/imported/2012/03/IMGP1299-1.jpg


Regards

Simon

[Greg Roles]

It should completely close and remain closed on ignition off, you hear it "buzz" for about 30 seconds post stopping, then it opens back up ready for next start. When idling it should be part open, and open right up with a rev. If it's not shutting that's not a major thing, more if it isn't opening.....still it could be throwing an error and thus the EGR is out, THAT will affect your idle / running....you're going to have to scan this, find a lappie or a buddy with Vag Com locally on here!!!

---------- Post added at 12:26 PM ---------- Previous post was at 12:24 PM ----------


Tell me more about getting the EGR coded out please!

It's something you ask the tuner to do, I'd expect anyone that has a decent diesel range of tunes would be able to do it, certainly Parso, Custom Code and Viezu can in my experience, no doubt others can too.

[nissman]

It should completely close and remain closed on ignition off, you hear it "buzz" for about 30 seconds post stopping, then it opens back up ready for next start. When idling it should be part open, and open right up with a rev. If it's not shutting that's not a major thing, more if it isn't opening.....still it could be throwing an error and thus the EGR is out, THAT will affect your idle / running....you're going to have to scan this, find a lappie or a buddy with Vag Com locally on here!!!

I have just given the car a drive and it now idles as it used to(between 820-840rpm). Still not sure about the intake flap though. I was only turning the ignition on/off and not actually starting the car. Can I pull the large main intake pipe from the bottom of the intake flap and start the car without any damage to the engine and check what position it is at when running?
BTW there are no error lights up on the dash. Does this mean their wont be any error codes if checked by a VAGcom or can there still be errors even with no dash light errors shown?

Regards

Simon

[Transporter]

I have just given the car a drive and it now idles as it used to(between 820-840rpm). Still not sure about the intake flap though. I was only turning the ignition on/off and not actually starting the car. Can I pull the large main intake pipe from the bottom of the intake flap and start the car without any damage to the engine and check what position it is at when running?
BTW there are no error lights up on the dash. Does this mean their wont be any error codes if checked by a VAGcom or can there still be errors even with no dash light errors shown?

Regards

Simon

Not every code will set the ECM light on and stays on. But if the fault doesn't exist anymore, the car will drive normaly and codes stay in memory without any ill effect until cleared

[nissman]

From what I have been reading the intake manifold flap motor is there as an anti judder when turning off the engine. It closes upon turn off to kill the oxygen supply and then opens again after 3secs. If it fails in the open position it may just judder a bit upon turn off and has no effect on the running. When turning off the engine there is no noticeable difference in an increase of judder (it is smooth as it was when it was new). I will buy one of these obd2 boxes to read some fault codes though.

Does anyone have any suggestions on what to buy? I like the idea of these bluetooth ones here.
Bluetooth Scanner OBD2 OBD II Diagnostic Interface Scanner Fits Android Torque | eBay (http://www.ebay.com.au/itm/Bluetooth-Scanner-OBD2-OBD-II-Diagnostic-Interface-Scanner-Fits-Android-Torque-/130660722793?pt=AU_Car_Parts_Accessories&hash=item1e6bfc6869)

Regards

simon

[Transporter]

From what I have been reading the intake manifold flap motor is there as an anti judder when turning off the engine. It closes upon turn off to kill the oxygen supply and then opens again after 3secs. If it fails in the open position it may just judder a bit upon turn off and has no effect on the running. When turning off the engine there is no noticeable difference in an increase of judder (it is smooth as it was when it was new). I will buy one of these obd2 boxes to read some fault codes though.

Does anyone have any suggestions on what to buy? I like the idea of these bluetooth ones here.
Bluetooth Scanner OBD2 OBD II Diagnostic Interface Scanner Fits Android Torque | eBay (http://www.ebay.com.au/itm/Bluetooth-Scanner-OBD2-OBD-II-Diagnostic-Interface-Scanner-Fits-Android-Torque-/130660722793?pt=AU_Car_Parts_Accessories&hash=item1e6bfc6869)

Regards

simon

I bought it just out of interest and for playing with. It's quite cool and goes well with my Galaxy Tab. I will check tomorrow morning how good is it for reading and resetting fault codes and let you know. Unless somebody let us know before that. :)

Definitally worth $30.

[Transporter]

I bought it just out of interest and for playing with. It's quite cool and goes well with my Galaxy Tab. I will check tomorrow morning how good is it for reading and resetting fault codes and let you know. Unless somebody let us know before that. :)

Definitally worth $30.

...and maybe not. It will not detect intermitent faults like over/under boosts. The faults reading capabilities are far from VCDS. I must say it is not reliable as the diagnostic tool. :(