GolfGTIforum.co.uk

Model specific boards => Golf mk2 => Topic started by: cooperR on 20 February 2009, 16:48

Title: Intermittent lumpy engine
Post by: cooperR on 20 February 2009, 16:48
Hi all. I just noticed that my Mk2 Gti has developed a mild sickness. After short blasts driving around with occasional high revs, the engine would settle into a lumpy idle at around 1k rpm, as if the fuel mixture changed. This ceases to occur once the engine is restarted and would immediately feel smooth. Subsequently, it will revert to the lumpy mode once driven for a short while at high revs. Any advise would be greatly appreciated as I could not pin point the problem area and it is driving me nuts (the engine sounds rather good at lumpy idle thou, a bit like an air cooled VW  :smiley:) . Thanks.
Title: Re: Intermittent lumpy engine
Post by: DarnPB on 20 February 2009, 17:30
What injection system are you running? Kjet or Digifant?
It may just be a case of worn plugs. Worn plugs could overheat and cause a hotspot in the cylinder. This will in effect alter your timing by causing the mixture to burn prematurely.
Title: Re: Intermittent lumpy engine
Post by: Conker on 20 February 2009, 18:21
My 16v does similar things when it needs new rotor arm/cap/plugs.

Title: Re: Intermittent lumpy engine
Post by: maxp on 20 February 2009, 22:50
MMm mine is similar - ok when first starts - constant 'brrr', but after 30 mins the 'brrr' is replaced intermittently by the odd cough.

It used to do it really badly but ive chnged the leads and plugs but it still does it a bit...rotor arm need replacing?

Mine is a digi btw
Title: Re: Intermittent lumpy engine
Post by: OakeyDoak16v on 20 February 2009, 22:56
MMm mine is similar - ok when first starts - constant 'brrr', but after 30 mins the 'brrr' is replaced intermittently by the odd cough.

It used to do it really badly but ive chnged the leads and plugs but it still does it a bit...rotor arm need replacing?

Mine is a digi btw

Just change it, only costs pennies :smiley:
Title: Re: Intermittent lumpy engine
Post by: cooperR on 21 February 2009, 03:48
Thanks,you guys are ace  :smiley: Will have those replaced then.Mine is a k-jet 16v kr with 9a block.
Title: Re: Intermittent lumpy engine
Post by: mattkh on 21 February 2009, 08:15
....... This ceases to occur once the engine is restarted...
Hi
Is the restart done immediately or after a few minutes ?
Title: Re: Intermittent lumpy engine
Post by: cooperR on 21 February 2009, 14:13
Hi Matt, the restart is done immediately,every time.The engine seems to reawaken to silky smooth idle by doing so.