blt engine odd idle ( pd130)

[spud31]

Hi my 08 biza fr has started doing some really odd things when fully warm.
The car starts to idle very lumpy an shake the steering wheel, dosnet do it all the time first time was after a constant speed run on the m1 to a dead stop due to tailback, an after a period of a few mins hard accleration through the gears then back to idle.
VCDS reports no faults an IQ looks ok just no3 a little out but within specs.
Ive noticed that sometimes touching throttle gently makes it go away?
Most are saying DMF on way out but according to LUK technical man you would feel the out of balance feeling all the time.
Also when crusing you sometimes get a smell of synthetic oil through the vents, has no leaks so only can assume its breather or egr leaking?

Any Ideas

P.s is the torque measurement in VCDS accurate?

Thanks

Spud

 

[DarrenJ]

Had simillar prob. My egr @ 60k miles:

i would check it

 

[spud31]

Cheers Darren
Yours is a pd150 so dosent have valve infront of EGR, better access on yours.
Were the bolts holding the egr pipe to valave very tight ? (6mm hex head)

 

[cheshire cat]

Cheers Darren
Yours is a pd150 so dosent have valve infront of EGR, better access on yours.
Were the bolts holding the egr pipe to valave very tight ? (6mm hex head)

mine does similar and always has I recon' it's not enough load at idle slight increase in revs fixes it,I don't believe my flywheel is on the way out yet it may interest you to lnow that at idle every I think 2 minutes the egr closes for a while ---I guess to stop overheating may be relevant to your prob'

 

[muddyboots]

My PD130 Ibiza always used to do this as well.
The slightest touch on the accelerator stopped it, I got into the habit of doing so every time I stopped at traffic lights...

 

[DarrenJ]

Cheers Darren
Yours is a pd150 so dosent have valve infront of EGR, better access on yours.
Were the bolts holding the egr pipe to valave very tight ? (6mm hex head)

No the bolts weren't too tight at all, I used a long allen key and had no bother at all.

What was happening to mine was it seemed to be switching from a rich to a leaner mixture, I could actually hear it 'clicking' from one to the other and the exhaust note changed when this happened, along with more smoke. I changed the MAF and clened out the egr plus removed the vac pipe going to it which disengages it so this shouldn't happen again for a long time.

Very bad design I have to say! Whoever thought that opening a valve from the exhaust into the inlet mani allowing soot to flow into it from this side and then the crankcase breather flowing oily warm sticky vapours in from the other side has a lot to answer for!

 

[Phil_JJ]

Next time it does it try turning your a/c on and your rear de-mister and see what happens..

 

[DarrenJ]

Next time it does it try turning your a/c on and your rear de-mister and see what happens..

The revs fall even more?

 

[Muttley]

DarrenJ wrote

Very bad design I have to say! Whoever thought that opening a valve from the exhaust into the inlet mani allowing soot to flow into it from this side and then the crankcase breather flowing oily warm sticky vapours in from the other side has a lot to answer for!​

The reason for the EGR system is pollution control. No, really!

Because the Spanish founded Los Angeles in the place known locally as "the valley of the smoke", Californian emission control paranoia drives US automotive emission control regulations and so affects any car maker who wants to sell in the US.

EGR is a foul kludge put in place to reduce NOx emissions, by injecting inert gas into the inlet charge to reduce the oxygen content during transient peak power demands that would otherwise cause cylinder temperatures to rise to the point where nitrogen is burned into nitrogen oxides. Which are Bad(tm) because California thinks they cause smog.

Inert gas could be anything that doesn't burn. Pure CO2 would be ideal, but would need a gas tank in the car that had to be recharged. Exhaust gas is free, and close enough to inert for car designers driven by their accountants.

Scientific opinion is far from agreement on the role of NOx in smog formation. In the mean time, EGR in diesels causes pollution - it increases soot in the exhaust every time its used - far outweighing the dubious benefits of NOx reduction, in my opinion.

 

[DarrenJ]

That's some info there Muttley! Well I think it's a pure waste of material -there's a bloody egr cooler too that gets in the way when you want to take off the inlet mani.

My car still isn't right after cleaning out that egr, never got around to cleaning out the inlet mani properly, but will do soon hopefully.

 

[spud31]

rite guys update.

It is the flywheel dying on my car as i get transmission shunt on downchange, an the odd idle when hot.
TBH when its bad touching the throttle makes no difference as its the two parts of the flywheel being out of balance.
Looks like warrenty going to meet the cost hopefully