how do you adjust the fuel mixture on a 2.8i cologne engine

[greavesy7]

My car is running lean does anybody know how to adjust the fuel mixture on a v6 cologne engine

Thanks Adam

[greavesy7]

Also my washer motor has stoped working there is power going to it so i guess it must have burnt out does anybody know wear i van get another one

[mk2 24v]

the mixture is adjusted by using a loong allen key in the metering head

tis a long way down, and you shouldnt apply pressure to it whilst adjusting, as that cocks up the settings

[greavesy7]

which bit is that is there any chance of a pic or a diagram

[grahamw48]

greavesy7 said:

Also my washer motor has stoped working there is power going to it so i guess it must have burnt out does anybody know wear i van get another one

Take the old washer motor down to your local car accessory shop.

Just get one with similar mounting points and electrical connectors.

They're all pretty much the same.

Cost £7-£14.

Screw the new one back on, clip off the ends of the old plastic pipes, which will have gone hard.

If you need new plastic pipe, you can buy it from pet shops (used for aquariums), plus any fittings like T-joints.

I know this because I used to own a tropical fish shop...and a TVR.

[mrzigazaga]

Hi chaps.. There was some posts regarding this a few weeks back as i was being advised how to but it does stress in the info relating to the fuel mixture that it is factory set and shouldnt be touched.. there should be a tamper proof seal on it..Not sure if it can be done accurately without gas analysers but it can be done..Its the stem poking up in between the fuel dist cover and the in and outs of fuel unit.zig

[grahamw48]

Try this page...some good diagrams (can't scan in my Haynes).

http://www.diagnostic-assistance.co.uk/mech_inj.ht...

[mrzigazaga]

In the pic that graham has posted you can see the mixture screw on the sensor plate and directly above that is a brass tube bout inch an arf long. should have a tamper proof cap unless its been removed already..If you take off the sensor plate cover..the big rubber cap thats connected to your air intake to carb you will see it better.. I know the spring can be adjusted that holds the position of the sensor plate..I not sure if its something you want to fiddle with.. dont want to undermine your cababilities but if you mess it up the fuel metering unit alone is over a grand if you can get one..

[jeff m]

As mentioned that is supposed to have a tamper proof cap on it.
That is called a mixture adjustment but that is not the way to adjust the running of a CIS car. That will not change the CO of your car if it is running lean. It will adjust the CO at idle, but only after EVERTHING else is correct. Touch at your own risk. Unless you know how to adjust it.

That's a good link for understanding CIS.
It works by supplying an amount of gas proportional to the air flow thro the lift plate.
Lean running or lean idle?
What is your current CO how lean is it?


Before you do any adjustments I would advise a new fuel filter and two feedings of a good fuel adative/cleaner.
Next step would be to check the flow rate, then system and control pressure.
System pressure is adjusted with the pressure regulator.
Higher system pressure = higher control pressure = more gas per given amount of air. Richer mixture.

CIS does require CIS fuel pressure gauges to check it properly,(the one with a T) but if your system pressure is correct (74 +/- 6) you should be ok.
Flow test is the best place to start if you think you have a problem.
750ccs in 30 seconds (if you don't have the flow you aren't going to get the pressure.)

No amount of adjustments will compensate for a dirty fuel system.