Stevh0 said:
My car just came back from some idiot who fidled with the carb he reckons he knew what he was doing and now im suffering with poor fuel consumption
Unfortunately I have to start with more questions... Is the car actually running any better or worse apart from the fuel consumption? Are there 'flat spots' - do you have to push the accelerator harder than normal?
Is the choke being used - with the air cleaner housing off, can you see the choke flap fully open? Is the engine reaching full operating temperature (middle of the gauge?)
Is there misfiring? Have you checked the ignition timing and vacuum advance (more likely to cause excessive consumption)? Spark plugs looking OK? (mxture too rich would quickly give blackened plugs. Some carbon around the edge of the plug is normal, but the central insulator should be clean).
Even the cam timing could be off by one tooth, particularly if the cambelt has been changed recently. The cam pulley line corresponds to a notch in the cylinder head at approx. '18 minutes to the hour'. This is with the engine at TDC (crank pulley or flywheel lined up with the mark nearest the front, on the cambelt cover or clutch bellhousing respectively).
around 350 to a tank where i used to to 600 odd
That is indeed pretty bad. I would expect the engine to run really badly if the carburettor was solely responsible, but you haven't mentioned any symptoms. Check the tyre pressures also, brakes not binding? Try pushing the car on a smooth flat surface.
does anybody know the stock settings for the fuel/air jets ?
Idle jet has '47' marked near the tip. Main air corrector 165, Main jet 105. It is not possible to swap jets by mistake on the 32 TLF, so these numbers are not going to be much help to you, as your expert tuner may have drilled the jets out
i do have the manual .. but i cant seem to find it in there ...
Not in the handbook, but it is in the Haynes manual, Chapter 13 (Supplement), which is half the manual. You can possibly download the relevant info from
http://www.unoturbo.za.net .
firstly what screw is what??
I have a top screw and a side screw
The 'top' screw I presume is actually the one mounted on an angle (approx. 45 degrees) with a hexagonal body. This sets the throttle plate opening = idle speed.
The 'side' screw is on the base of the carburettor, pointing towards the right side of the car (viewed from the driver's seat). This is the idle mixture screw. Note that it does not have much effect with the throttle open at higher revs. Mixture at these speeds is more a function of air leaks (if too lean) or blocked air filter (if too rich).
Turning them clockwise i would asume means making them richer or more air, cos the screw would be coming out?
The idle screw - turn anti-clockwise to decrease engine idle speed.
The mixture screw - turn anti-clockwise (screw coming out) to lean out the mixture (more air). Go around to the back and listen to the exhaust - if too lean, it will be 'missing' and the speed will probably be stumbling. If too rich, it will be 'chuffing'.
please guys this is urgent , its annoying the crap out of me .
Fair enough, with petrol prices the way they are!
Hope there's something helpful that I've suggested... but please note (if you hadn't picked up already) I suggest that if the engine is already running smoothly, trying to adjust the carburettor will probably make things worse rather than better. You really need to reflect on how the car is running (and of course, how it is being driven), and check all other aspects of maintenance. Maybe also check the consumption on a long trip by way of comparison.
-Alex