Carb Problem.

Post by **kaos** » 01 Sep 2007 12:55 pm

so as ive mentioned a few times arround the forum ive got crappy carb problems

bassically the mixture keeps increasing so its putting out 8%CO with is 6 above the 2% it should be. this means my 31.2MPG keeps dropping down to arround 25MPG. it means i constantly have to play with the carb screw some times im lucky and have the chance to do it on the emmission tester sometimes i dont and have to do it by turning it down untill the engine starts choking and then adjust back till it isnt. this at l;east gets my fuel consumption back.

Anyone got any ideas as to how to stop the mixture screw moving, or even sorting the problem out once and for all?

Post by **pettaw** » 01 Sep 2007 02:36 pm

1.4, 1.7 or 2.0? The mixture screws all work slightly differently

Post by **kaos** » 01 Sep 2007 11:55 pm

1.4 89

Post by **pettaw** » 03 Sep 2007 02:45 am

There's a spring on the mixture screw to help keep a bit of tension on it and stop it wiggling about. You'll have to take the screw out completely to see it, so be sure to remember the position of it (I do this by winding in gently and count turns out) before you take it out unless you've got access to a gas analyser easily

Post by **kaos** » 03 Sep 2007 03:20 pm

can get a gas analyser easy:)

so what do i do once ive removed the screw? check the spring over??

Post by **pettaw** » 03 Sep 2007 07:41 pm

Yup just check the spring's there at all

If provides no other function other than to stiffen up the adjuster screw a touch so it stops it drifting, so its possible someone removed or lost it.

Post by **kaos** » 04 Sep 2007 02:34 am

replacement avalible?
looks like i'll have a play tomorrow and check.

Post by **kaos** » 05 Sep 2007 11:58 am

haha...

im screwed. the screws gone missing its in the engine bay or on my gravel drive. and i promised to take the girlfriend to hospital in the morning. OH F***

Post by **Chris_C** » 05 Sep 2007 01:31 pm

Screws on gravel drive... been there.. done that, bought a magnet

Post by **kaos** » 05 Sep 2007 01:34 pm

lol..

its got to be in the engine bay really. btu i cant find it any where is it just a screw or is the a needle ont he end because i might have a bolt/ or pc grub screw that would fit.. but my old mans going through motor factors for me

ooh magnets shit i forgot theres 6 on the trailer!!!!!!

Post by **kaos** » 05 Sep 2007 02:20 pm

appologies for the double post.

i have now found the mixture screw! it was wedged right at the bottom of the engine between the the sump and another component near the starter motor/might have been the starter motor.

now to clean it off.

and to answer the early question spring condition is good. and the screw and needle is in good condition. doesnt look threaded either.

Post by **Chris_C** » 05 Sep 2007 02:55 pm

Awesome, glad you found it! Can't help about the screw though, it's a long time ago I played with the 1.4 carb, even if I did have one for 6 years!

Post by **kaos** » 05 Sep 2007 04:10 pm

aye it is good. well ive re instaled it and been up the garage. since that post. Running lean now at about 0.16CO%

and it wont budge from down there. so my mpg should stay good for sure. the mixture screw since putting it back on is very tight and hard to adjust with a screwdriver. so im assuming its now on correctly etc.