Intermittant hesitation/missfire/judder 2009 2.0 170 TDCR

[WesBrooks]

Afternoon All,

 

I'm looking for pointers on what might be going wrong in my engine, and potentially if there is a DIY (I'm mechanically competent, but not garage tradesman) a fix for it.

 

Car:

2009 170 TDCR Executive Saloon/Hatch

 

Scenario:

Occurs on slight acceleration after either coasting down hill or very light throttle cruise on a motorway, such as following an lorry.

 

Fault:

Feels like a missfire on a petrol, sudden drop in power sounds and runs rough until it clears.

 

Cures with:

Either passes naturally quite quickly or I've dipped the clutch and revved the engine.

 

Other notes:

Nothing seen on my Bluetooth OBD dongle, nothing permanent on maxidot. Did once flash up 'Engine Service Fault' on maxidot before I had started the engine. The Turbo Actuator has been replaced before but a few miles have passed since then. Engine fault did show in the history on the last service but they wouldn't tell me what it was without me paying £45 for 'diagnostics' despite the computer must have already been in to see the history! :-o

 

Thanks for any advice you can offer!

 

 

[Nathanio]

What's your location as you could get out scanned by someone with VCDS.

[WesBrooks]

Merseyside, north west England.

[WesBrooks]

Stalled at lights today and couldn't get it started. Had 35 miles left on the tank. By the time I had the RAC on the way and the wife on route to get a jerry can full of diesel (about half an hour) it started again. Managed to stop my wife before she bought the fuel. I knew it hadn't run dry but wanted to avoid the you've run out conversation! Brimmed it when running and it only took 53l. Definately not dry!

Booked in at a local independant VW centre for a checkup.

[WesBrooks]

VAG scan and test drive showed uncovered no faults. Guess I'll just have to wait until it does it again!

[DarrellGB]

My money would be on the EGR, a clean could resolve it or buy blanking kit and have it mapped out to remove any future issues.

[WesBrooks]

That's what I've been thinking. Aren't they a bugger of a job to get to and often involve a cooler too? Are those engine clean services worth a shot?

Edited 28 May, 2016 by WesBrooks

[DarrellGB]

There only a pain on the 4x4 models, fairly simple on the cr170, companies such as Darkside Developments offer kits INC mapping out the EGR software, certainly worth doing on a vehicle you plan on keeping.

[WesBrooks]

I'll look into that then thanks. Just had a quick read about the engine flushes and I'll be giving that a wide birth!