Silk

My Octy has now covered 77,000 miles and has suddenly started running what can only be described as lumpy. It seems like it misses a beat every now and then. Nothing I can really put my finger on. The dealer said he could see what I meant but couldn't see any error codes and seemed to have no idea apart from an ECU update, which he said he did.

Well, it's made no difference. I thought it might bee the fuel, but I've filled up twice since it started happening last week.

Anyone have any ideas?

TIA

Steve.

_ZS_

Could it be since the hot weather of the past week or so?

I know my car ran like *** on the way home from work with the aircon on when the temp is over 22C - the intercooler is sandwiched between the aircon radiator and the engine coolant rad on the Astra, which heatsoaks the intercooler. Cleaned all the rads with an airline (must have been a bazillion flies stuck in them) and it's running a little better. Agressive remap + crappy standard IC + 22C + aircon = laggy smoky progress.

bigjim73

My VRS ran fine in the mornings and then like a dog in the afternoons pretty much every day last week.

I also got the DPF light up after spending a long time in traffic and mine's only done 21000.

I put the lumpiness down to the heat and the non-availability of any decent cool air (London driving) and the DPF light was fixed with a good thrashing down the Motorway!!!

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cheezemonkhai

Dual Mass Flywheel possibly.

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Taxi 219

Can the DMF make a car run lumpy.I would presume thats idle only

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Car now: 56 Octavia MK2 1.9TDi Ambiente-Debadged-Metallic Flamenco Red DMF Reqiured soon
Previous: 06 Octavia Mk1 1.9TDi Classic with + pack-Diamond Silver
Sadly missed: 97 Nissan Primera 2.0TDi SLX- Red
Paul

Lummox

Yep, throws the crank signal out and the engine ecu gets confused.

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cj_uk

My 2.0 TDI has developed a 'heart beat' at idle, but not all the time, which is strange It's not a year old yet but I've covered 23,000 miles.

Gerryco

I have exactly the same problem as cj, except I didn't have to wait 23k miles - it was noticeable very soon after buying my 2.0 TDI, with only 10k on the clock. I assume that its full dealer service included checking engine settings and erasing bugs (literal and figurative).

Silk

Mine's a late 06. Do they still suffer?

It's hard to describe exactly. It's a kind of hesitation. It feels like the engine is cold all the time and it's about to stall - It did stall once and I didn't expect that on DSG. After a long journey, you feel a bit seasick. Passengers notice it as well.

The dealer, Streets, Bristol wasn't really much help.

cheezemonkhai

Can't comment on sea sickness, but I've been through a couple of DMF's

Very easy stalling seems to be one of the first signs of it going along with vibrations.

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Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

nickcoll

There's an article in this week's AutoExpress about very recent problems with the 5% biodiesel blend in filling station tanks which haven't been properly cleaned out for a while. Take a look - Biofuel bacteria wrecks engines

ANDREW2210

some pd diesel can get a problem on lekage injectors, make sure oil level not going up.