1.9 n/a tuning

Philip Chidlow · Post by **Philip Chidlow** » Tue Aug 23, 2011 11:35 pm

OK, not tuning as such, but given that my 1.9 diesel seems to be under-performing, and giving suspiciously good emissions readings - even at 157000 miles, I have been told it might not be getting quite the optimum amount of fuel. Otherwise it runs like a dream with no uneven idling or hesitation...

First place to look might be the pump? (Bosch).

Or just live with it?

sdelasal · Post by **sdelasal** » Tue Aug 23, 2011 11:48 pm

Hi Phil - there is a lot of technical info out there on the Bosch VE pump especially in the american VW community - Golf/Jetta/Rabbits! There is a fuel adjustment screw which you can use to increase fuelling - see http://www.brick-yard.co.uk/forum/ve-in ... 17456.html - fourth from last picture - the adjustment screw in the centre above the stop solenoid. The BX pump shoudl be pretty similar. Small adjustment like 1/8 - 1/4 turn max may help. I can't remember which way goes richer on fuel. Steve

citronut · Post by **citronut** » Wed Aug 24, 2011 7:55 am

i had my old 1.9N/A D gass flowed/portted, after which she did not have any more top end to speak of, but accelarated up a lot quicker through the gears,

she would also run in 4th gear at 30mph with smoothly,

drove on a sniff of derv,

not the she didnt drive well before hand as she did,

regards malcolm

Post by **Tim Leech** » Wed Aug 24, 2011 10:20 am

Had a similar problem with a car of mine albeit a petrol one, the emissions were too lean (had been fiddled with for the MOT), it was fine on choke but a bit gutless otherwise. Also I imagine running it too lean wont do it much good. A quick twirl of the adjustment screw and voila.

I would try and getting it adjusted up a bit and see if that makes a difference.