Hi,

my lad has a 2003 Fabia 1.2 6v and recently when I've driven it I have noticed occasionally a hesitation or mild 'misfire' when accelerating. also noticed that on cold start the engine can be quite lumpy at idle.

So today I decided to have a poke around and look at the plugs etc. didn't find anything obvious so put her back together but while running the engine I noticed a rubber hose on the off-side of the engine had collapsed. Turning off the engine and the hose returned to a normal shape; so a vacuum issue maybe?

The hose in question comes from a black disc shaped valve? just under the engine cover and close to the cam cover, connecting to a rigid pipe clipped to the rear of the cover then to another rubber hose which connects to what I suppose is the throttle assembly.

Has anybody else come across a similar thing and if so what was the fix?

Thanks,

TP

im pretty sure that is an oil breather pipe.Id get it pulled off and check for it being clogged up from oil vapour.Then see what happens.

Thanks Matt,

will have a look; although I'm still inclined towards part of the vacuum system as it leads to the other side of the engine and connects to a block attached to the underside of the throttle body? This block has another pipe leading to the brake servo.

Anyway here's a pic of the offending pipe.

Regards,

TP

Part of brake servo vacuum circuit.

Part of brake servo vacuum circuit.

Thanks,

does it link into the throttle assembly as well, like in the days of vacuum advance? trying to work out if this could be the cause of the hesitation when accelerating.

Regards,

TP

Had the vacuum pipe replaced by the supplying dealer FOC with a updated part as the old one had perished. Improved things slightly but given the usual dealer waffle that it's normal for the 1.2 HTP to hesitate :S

Anyway had to call in to the dealer who supplied my Yeti and I mentioned this to the service manager, he advised me to remove and clean the throttle body with carb cleaner (5 minute job, 4 x Torx? bolts) as there prone to get gucked up with oil and dirt; amazing result like driving a new car

TP

We had one of those pipes fail on a Polo. We replaced it and the engine would not idle at all. We resolved it by erasing the learned values in the ECU and putting the throttle body into basic settings. The ECU adapted to running with the faulty pipe and its stored values would not let it run with the new pipe.