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Model specific boards => Golf mk4 => Golf mk4 TDI => Topic started by: 16VWarby on 04 December 2011, 20:53

Title: 150 mpg dropped a bit.
Post by: 16VWarby on 04 December 2011, 20:53

My sisters 150 (79k miles approx) has recently been a bit crap on fuel, the computer shows 38-40 mpg. It got a bit better when it was mapped last weekend but she used to get 45+ out of it regularly.

I service it (oil, fuel filter, clean the K&N panel etc) as it comes due and was last done about 5k ago.

So, I'm going to clean the AFM next but was also thinking whether the DPF could be getting a bit clogged with the short journeys we do over here as it always runs better after shes been across to college with the motorway run.

Im impressed with its power now its been mapped though! Not as fast as my smelly nissan but very good for an aul derv and a possible replacement for my 4mo :)

Cheers
Nick

Title: Re: 150 mpg dropped a bit.
Post by: Steve_PD on 04 December 2011, 21:12

Could be the MAF.
Dont have a DPF got a EGR which might be getting blocked also the inlet manifold. might be worth taking both off and cleaning them

Title: Re: 150 mpg dropped a bit.
Post by: Organisys on 04 December 2011, 21:14

Sure it's not just the colder weather?

 :smiley:

Title: Re: 150 mpg dropped a bit.
Post by: Steve_PD on 04 December 2011, 21:23

Cold weather will make it drop about 5mpg

Title: Re: 150 mpg dropped a bit.
Post by: scarr89 on 04 December 2011, 22:22

Quote from: Steve_PD on 04 December 2011, 21:23

Cold weather will make it drop about 5mpg

That much really, crickey!

Title: Re: 150 mpg dropped a bit.
Post by: 16VWarby on 05 December 2011, 22:29

Didnt know the cold made it worse, it was in the last couple of months but its only got cold in the last week & lost about 10-15mpg. So i'd best clean the maf & egr methinks.. Cheers Guys :)

Title: Re: 150 mpg dropped a bit.
Post by: Gareth F on 05 December 2011, 23:49

Pump up the tyres
Redex in fuel
And pray for warmer weather  :grin:

My 130 is running about 52av in the cold  :angry:

Title: Re: 150 mpg dropped a bit.
Post by: 16VWarby on 06 December 2011, 20:06

Quote from: Gareth F on 05 December 2011, 23:49

Pump up the tyres
Redex in fuel
And pray for warmer weather  :grin:

My 130 is running about 52av in the cold  :angry:

My 200 sx is doing 22mpg when i baby it, about 12 when its on the pipe... I wouldnt be mad at 52, infact i'd be ecstatic :)

Title: Re: 150 mpg dropped a bit.
Post by: The Doc on 08 December 2011, 12:29

cold weather + MAF?

Title: Re: 150 mpg dropped a bit.
Post by: Anthony on 12 March 2012, 20:17

Ive cleaned the egr and inlet and fitted a new gen maf and still only get 35 around town and 45 on the motorway at 70/80 from my pd 150 the car is serviced regularly , but still its better than my last car a 350bhp subaru that was between 150 to 180 out of a 55litre tank :sick: