2002 2.0FSI A4 Avant...Lumpy/low idle RPM sometimes hard to start. WHY?

[j3aay]

Hi Guys,

Just bought the above car and it runs OK. However, sometimes it takes a couple trys to start, or it will start and cut out then require a bit of accelerator to get it to start.

When its started it doesn't stall but does run a little lumpy with the odd splutter...a definate missfire.

It drives great with what seems like no impact on power or fuel consumption (but then i am coming from a re-mapped BMW 330d so it's gonna feel a lot less powerful).

The car has FSH and isn't due a service for 7k yet. I was aware it went into a garage in November due to 'poor running' (seller told me and i have the reciept in hand). There it had a new MAF and Throttle sensor.

I also found a reciept for a few months back for a 'nocks' sensor, i assume this should say NOx sensor which i have read a faulty one could show these symptoms. But then it has been replaced.

I have no warning lights or other complaints...just the lumpyness and occasional reluctancy to start.

Anyone help at all?

Having just bought it i can't really afford to get it looked at (at least until its a real problem...it does drive fine when actually on the road at the moment).

Thanks guys!

[yaman]

There are so many sensors and moduls on these cars that the
only way to go, and, at least, narrow it down, is to get a
diagnostic-scan done. That gives you a fighting chance, and
will save you a fortune on changing good components.

Regards
Jim

[j3aay]

Thanks for the reply. I am hoping to rule out minor faults if I can as cash is tight. I have tried replacing a coil pack and moving it around the cyclinders...that did nothing.

Most people think it's an air leak or a faulty breather/valve.

I am waiting for a dry day so I can chase down all the hoses and make sure they are all in tact. Although I am really hoping I find one as that's an easy fix!

Cheers