MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: taff-turbo on November 29, 2011, 10:56:26 pm

Title: engine running issues
Post by: taff-turbo on November 29, 2011, 10:56:26 pm
Hi!  :smiley:
I've had my (standard) 07 Gti for nearly 4 years with no issues...... til now  :sad1:
Issues: Lacking power
           Sounds like a holed exhaust on overrun (popping)
           Fuel economy not marvellous
           Slight mayonassing on oil cap
           Lumpy idle

Any ideas? split dv, pcv fail, or.......? where do i start? or recomendations for somewhere in peterborough/cambridgeshire to have a look?

oh, and its done 28k and had a major service/cambelt @ vw 1k miles ago

thanks  :happy2:
Title: Re: engine running issues
Post by: sub39h on November 30, 2011, 12:26:03 am
mayo in the oil cap i learned recently is due to the cold weather. my car doesn't do it and it wasn't something i was aware of before. the 2.0T's efficiency drops quite a lot in the cold a well for reasons i can't quite figure out.

sounds like you've got a misfire. you had it scanned?
Title: Re: engine running issues
Post by: taff-turbo on November 30, 2011, 01:16:06 am
not had it scanned yet, good news about the mayo  :happy2: hopefully misfire is coilpack as it should've had plugs recently  :surprised:
Title: Re: engine running issues
Post by: GrayMK5GTI on November 30, 2011, 07:14:04 am
Quote from: sub39h on November 30, 2011, 12:26:03 am
mayo in the oil cap i learned recently is due to the cold weather. my car doesn't do it and it wasn't something i was aware of before. the 2.0T's efficiency drops quite a lot in the cold a well for reasons i can't quite figure out.

sounds like you've got a misfire. you had it scanned?

All engines loose some mpg in the cold weather, that's normal. Cold dense air needs more fuel to burn with it.
Title: Re: engine running issues
Post by: sub39h on December 01, 2011, 01:22:36 pm
Quote from: GrayMK5GTI on November 30, 2011, 07:14:04 am
Quote from: sub39h on November 30, 2011, 12:26:03 am
mayo in the oil cap i learned recently is due to the cold weather. my car doesn't do it and it wasn't something i was aware of before. the 2.0T's efficiency drops quite a lot in the cold a well for reasons i can't quite figure out.

sounds like you've got a misfire. you had it scanned?

All engines loose some mpg in the cold weather, that's normal. Cold dense air needs more fuel to burn with it.

that doesn't make sense tho? more oxygen + more fuel = more power, so you'd have to use less throttle to maintain the same speed, right? so the fuel efficiency shouldn't change.

(sorry this is off topic lol)
Title: Re: engine running issues
Post by: Kregiel on December 01, 2011, 01:30:00 pm
fuel efficiency is impacted greatly due to other factors: long time to bring engine to operational temperature and heating/wipers/heated windshield on... I would say performance wise the colder the better as easier for engine to cool ect ect might be wrong here though
Title: Re: engine running issues
Post by: bacillus on December 01, 2011, 03:07:39 pm
On the same long run I've found that the car uses more petrol when it's colder.