MK5 TDI Idling high

[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

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

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.