on thursday i did a trip on the m5 for 4 junctions, i did this journey at a constant 65mph and the journey is 8 miles, my fuel consumption was a staggering 18.5mpg
i dont know if some of you saw an old topic about fuel consumption on a 1.8 petrol about 3 years ago, but back then mine was, at 60mph it was 39.8 mpg and at 70mph it was 36.5 mgp
so its a slightly drastic drop for around 37mpg to 18.5mpg
anyway, sunday i decided to do somethin about it, so i set about findin out wot the problem was, (i know from 2 previous vagcom scans on my car the throttle body has come up on both but didnt know exactly wot the problem was coz it was an intermitent problem), so that where i based the problem, the throttle body
i used this guide to guide me on how to take it all to bits
http://www.taligentx.com/passat/mainten ... ottlebody/" onclick="window.open(this.href);return false;
and also used my trusty haynes manual lol
here are a few pics i took
there are 2 pipes into the back of the throttle body air inlet pipe, and when i disconected these 2 pipes i found a problem with both of em, the thinner pipe i found had a big hole in it
and the thicker pipe i think is an engine breather pipe, this had disconected from the engine (plastic tube had snapped)
i solved the thicker pipe by insertin a smaller pipe and insertin it back into the breather, the thinner pipe i had to purchase some more 8mm pipe and make new
onto the throttle body, i undid the 5mm allen bolts and removed the throttle body and found a lot of black carbon built up inside around the butterfly flap, so with the aid of a tin of brake cleaner i began to get rid of the build up and all the stains
wot the throttl body looked like
and after i had cleaned it
i replaced the gasket with a new 1 and put it all back together, took it for a spin, first put 20quids worth of petrol in and set off up the motorway, ended up doin 100 miles there and back lol
guess wot....... 34mpg at 65mph
sorted with a big grin on my face
jobs a good un
