Bumpy / Rough Idle

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abathingape

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hey - recently I noticed a bumpy idle which i didn't really take any notice of but over the past few weeks it's got a fair bit worse. I've got 72k on the clock so i'm due a service in around 5k miles. On a cold start it takes a couple of seconds to startup and then the rough idle begins. Usually first thing in the morning and when i've finished work. I noticed it got worse after a round trip towards Manchester which clocked up around 400 miles but i'm by no means a rough driver - especially on long journeys.

Any ideas ??
 
170bhp Tdi? If so that's the least of your problems...

Our does it and I've given up trying to find a fix
 
no didn't show up on diag, just had mine cleaned and the rough tick over and slight hesitation around 1800revs(not all the time) seems to have gone
 
ctd said:
no didn't show up on diag, just had mine cleaned and the rough tick over and slight hesitation around 1800revs(not all the time) seems to have gone
Click to expand...

jeezo that sounds exactly like mine, I felt a slight bump at just under 2,000 revs this morning. Did you clean it yourself?
 
No local performance garage did it for 1hrs labour/£62.50, not worth getting hands dirty for that much
 
Our EGR valve looks brand new from outside and is much cleaner than the rest of the engine. I have asked my mechanic to clean it when it's been in for work in the past so assume he has done it. We still have lumpy idle and hesitation in the rev range... We also have the dreaded limp mode and no clear solution.

Onlyfault code gives us low bost pressure and apparently there is a long list of possible components. Mechanic has suggested working through it starting with the cheapest first. Fecking car!
 
Clean the EGR valve, take the inlet manifold off and clean all the crud from the flaps and while it's off change the vacuum actuator ( only about £10 ) as the diaphragms split inside. Did mine and it runs much better, no more hesitation or rough idling. Quite an easy job.
 
Will probably give this a bash this weekend and will report back my findings, cheers for the replies so far.
 
If you are replacing the vac unit the main dealer may not find the part number.
It is S03G129061C

You'll also probably need egr gasgets and inlet manifold gasgets ( less than £10 for all 3 )

Oh and about 2 - 3 cans of carb cleaner aerosols :)
 
mm707 said:
If you are replacing the vac unit the main dealer may not find the part number.
It is S03G129061C

You'll also probably need egr gasgets and inlet manifold gasgets ( less than £10 for all 3 )

Oh and about 2 - 3 cans of carb cleaner aerosols :)
Click to expand...

thanks mate - should I be touching the anti shudder unit?

Are you using ETKA by the way?
 
I did a service on mine and new air filter improved the judder. But this is defo on my list of jobs. Once the wifes A3 is back on the road. Does it improve economy at all if so it will go higher up the list :)
 
5aq1b said:
thanks mate - should I be touching the anti shudder unit?

Are you using ETKA by the way?
Click to expand...


I got my parts from TPS , the part numbers are from their invoice, pretty sure they are ETKA - prefer to use them than main dealer.

you need to unbolt the anti shudder unit but don't do anything with it.

One thing to watch out for, which caught me out, is that one of the inlet manifold bolts is in the air intake and probably covered in muck so not easy to see at first.

gasget part numbers are

03G131547F
069131547D
03G129717D

There is a good thread on here somewhere about removing the EGR, I just followed that and the inlet manifold is easy.

The vac unit will only go on once the manifold is off and it's fairly obvious to see how it fits.
 
mm707 said:
I got my parts from TPS , the part numbers are from their invoice, pretty sure they are ETKA - prefer to use them than main dealer.

you need to unbolt the anti shudder unit but don't do anything with it.

One thing to watch out for, which caught me out, is that one of the inlet manifold bolts is in the air intake and probably covered in muck so not easy to see at first.

gasget part numbers are

03G131547F
069131547D
03G129717D

There is a good thread on here somewhere about removing the EGR, I just followed that and the inlet manifold is easy.

The vac unit will only go on once the manifold is off and it's fairly obvious to see how it fits.
Click to expand...

thanks mate - what tools do i need to take these off?
 
dubdemand said:
Our EGR valve looks brand new from outside and is much cleaner than the rest of the engine. I have asked my mechanic to clean it when it's been in for work in the past so assume he has done it. We still have lumpy idle and hesitation in the rev range... We also have the dreaded limp mode and no clear solution.

Onlyfault code gives us low bost pressure and apparently there is a long list of possible components. Mechanic has suggested working through it starting with the cheapest first. Fecking car!
Click to expand...

HMM Has he cleaned the inside. Or just done the scratches head whats he asking me that for and cleans the outside anyway. .. ;)
 
dubdemand said:
We also have the dreaded limp mode and no clear solution.

Onlyfault code gives us low bost pressure and apparently there is a long list of possible components. Mechanic has suggested working through it starting with the cheapest first. Fecking car!
Click to expand...

What is the error code number ?
 
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