Thread: Disco Problems, Maybe MAF?

PhilipA
Thanks for that MAF voltage info.
I have just been out & checked mine & the voltage is 1.0. Is it worth adjusting this up a smidge or leave well alone?

Where is the "magic screw" located for future refernce, as I cannot see anything obvious.
Its a 5AM MAF.

Thanks.

Originally Posted by 4bee

Where is the "magic screw" located for future refernce, as I cannot see anything obvious.
Its a 5AM MAF.

Thanks.

If you are looking at your MAF with the intake on your left and the engine side on your right you will see a metal tube protuding from the right hand side of the electronic box part of the MAF. It may have a tamper proof plug in it.

Thanks Justin.

Saw that but didn't want to touch it until I knew more. Yep it seems to have a disc in it.

Do you think it's worth having a tweak or let sleeping pooches still continue kipping?

Well I would tend towards if your not having any trouble then leave it alone

From what I read it appears that 1.0v or close to it is right for stock non cat engines.
My engine has a remapped fuel chip and it still seemed happiest down near 1.0v (forget the exact reading). I don't have any fancy test equipment so I just did it by how it felt to me.

Originally Posted by Fade

Yeah thats what I though about the Vacuum advance as it should only advance the timing for idle and while cruising.

Basic problem I am having is when Im trying to drive it there is a complete loss of power. Sometimes the power would return to normal for a short period of a few seconds, but most of the time would just splatter along. Can only reach 20kmph and thats over a fair distance. That is after cleaning plugs and adjusting maf.

Just a note that way the 3.9 is plumbed it will vac advance as you open the throttle, not cruise or idle.

I had at one stage replumbed mine to operate as you described above but didn't like the overall results and disconnected it entirely (mine's gassed).

edit. a faulty vac advance with give poor power & economy but not cause overfuelling

Originally Posted by PhilipA

I would also check the water temp sensor, a 2 wire sensor usually located on the RH front of the inlet manifold.Value should be 400 Ohms or less at normal operating temp.
Regards Philip A
.

Would this sensor by any chance have a boot about 1 1/2 inches long and two black wires ? I have this hanging down under neath my power steering reservoir and don't know where to plug it into... I've had a look around but can't see anywhere it should go. Its a 96 Disco V8

Faulty injectors can cause overfueling.
I ran mine on LPG without using petrol frequently. When I pulled the injectors the needles were stuck open and the caps were missing on some. Fuel was gushing out of them hence black smoke out the exhaust

hi fade, not too sure where gosnells is but i'm located in butler - northern suburbs of perth if your close enough i have a spare complete v8 with coil maf etc..
your more than welcome to come and try swapping some pieces over to see if you can find out exactly whats going on.
jason