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Model specific boards => Golf mk5 => Topic started by: streetbeef on 01 March 2012, 18:58

Title: very lumpy running when cold gti pirelli
Post by: streetbeef on 01 March 2012, 18:58: hey guys, im posting this on behalf of my mate who has a mk5 gti pirelli, when the engine is not up to temperate and accelerating under 2k revs its stuttering like its slightly mis-firing and has hardly any power, i experienced it the other day when he took me out in it and its definately not right!! its not showing any fault codes whatsoever, when the car is up to 90 degrees it basically dissapears, any ideas???
Title: Re: very lumpy running when cold gti pirelli
Post by: Saint Steve on 02 March 2012, 20:26: Spark plugs been replaced?
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 03 March 2012, 07:32: Yes mate had 4 new plugs and coil packs yesterday and if anything he says its got worse! Could it be pcv?
Title: Re: very lumpy running when cold gti pirelli
Post by: Saint Steve on 04 March 2012, 18:33: Quote from: streetbeef on 03 March 2012, 07:32
Yes mate had 4 new plugs and coil packs yesterday and if anything he says its got worse! Could it be pcv?

Pcv would do it even when cold...

Have you checked the diverter valve? Diaphragm split..?
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 04 March 2012, 18:50: I actually got to drive it yesterday and it seems very slow for a pirelli so I really think its the dv now!
Title: Re: very lumpy running when cold gti pirelli
Post by: Hurdy on 04 March 2012, 19:51: Also pull out the maf from the intake and check it isn't blocked or dirty. Can also give a lumpy idle when cold.

HPFP cam follower could be worn depending on mileage too. Doesn't usually give a poor performance though unless completely wrecked.
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 04 March 2012, 23:04: Thanks for the help, will keep you updated on how's its going, dv and pcv he is replacing tomorrow :smiley:
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 18 March 2012, 13:25: just an update, well my mate has replaced the dv, all 4 coil packs and plugs, and the pcv with the latest revision and it still does it! its driving him mad, is mis-fires quite badly on cold start and just gives a slight mis fire under light throttle and feel as if its holding back, but when it gets to 90 degrees it seems to be ok and still no fault codes?! very confusing :huh:
Title: Re: very lumpy running when cold gti pirelli
Post by: bacillus on 18 March 2012, 15:17: Is this car remapped?
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 19 March 2012, 08:28: No its standard and has 60k on it
Title: Re: very lumpy running when cold gti pirelli
Post by: pandahouse68 on 19 March 2012, 19:01: Quote from: streetbeef on 18 March 2012, 13:25
just an update, well my mate has replaced the dv, all 4 coil packs and plugs, and the pcv with the latest revision and it still does it! its driving him mad, is mis-fires quite badly on cold start and just gives a slight mis fire under light throttle and feel as if its holding back, but when it gets to 90 degrees it seems to be ok and still no fault codes?! very confusing :huh:

could be coolant temp sensor G62
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 20 March 2012, 07:35: That would make sense mate, I will tell him today take it from there thanks, are they quite common on Mk5's then?
Title: Re: very lumpy running when cold gti pirelli
Post by: streetbeef on 21 March 2012, 11:33: Just found out the plugs he put in the other week are far too cold running for the car are the oem plugs for the pirelli the ones to go for?