Outer Limits 4x4 Board

well yester day after some mud driving

the paj when turned off would sudder and turn over like it still wants to run. it kinda feels like its stalling but ive tried it in neuatral and with the clucth in and it still does that

does any one know whats happening

my guess is fuel cut off solinoid

should be up underneath you inlet manifold with the fuel line plugged into it, it prob full of water or mud

i think its a petrol not diesel

i think its a petrol not diesel

yeah thanks

probably should off said that

Its a petrol

It may be unrelated to the mud?

Sometimes pistons carbon up on top, and when hot the carbon acts a bit like a glow plug, keeping it running similar to a deisel.

Petrol engines often have a fuel cut off, too, but I have no idea of your car. It should stop the overrunning even with carboned up pistons.

It could be that it comes good with some normal road driving.

good luck

christover

First thing's first - what's your idle speed? If it's too high, you'll get run-on, particularly when the engine is nice and hot.

I'm pretty certain the 2.6 has a fuel cut-off solenoid on the carby, and it will cause run-on if it's not working properly. It's energised while the ignitiion is energised, and should turn off when the ignition is off. Perhaps it's sticking slightly? Look for a little metal can screwed into the body of your carburettor, with one or two wires attached. Try removing and cleaning it.

Good luck,

Scott

my cordia was a petrol and had a fuel cut off solinoid

First thing's first - what's your idle speed? If it's too high, you'll get run-on, particularly when the engine is nice and hot.

when the car has warmed up its about 500rpm

I used to have a 2.6 petrol Triton and it had a fuel cut cut off solenoid on the carby that would de-activate when you turn the engine off. Its to completely stop the fuel entering the motor so it doesn't "run on".

If your idle is only 500 rpm and it still "runs on" you must have a lot of "glowing" carbon deposits in your combustion chambers or your sparkplugs.
Also if your sparkplugs are too "hot" they'll glow, you might need "colder plugs.
If your engine is running too lean it can cause exceesive heat build up too.

I'd be cleaning all your electrical connections under the bonnet first and checking to see if the fuel cut off solenoid is working.

Take the air cleaner off and get some one to turn the igition to the on position. The flap down inside the carby should open a little (not the one on top). If it looks like its already open a bit its probably stuck open and will still let fuel in when you turn the engine off.
High compression or hot deposits in the chambers will ignite the fuel and cause the run on.
Not really good for the engine either.

Also if your sparkplugs are too "hot" they'll glow, you might need "colder plugs.

my plugs are NGK bp5es they are the one that the manual recommends for my car

so now im thinking it will most likely be

-carbon deposits
OR
-fuel cut off soleniod

well ive done a little test, i ran it for 3mins, ran fine and when turned off no run on.

so im guessing now that it is the glowing carbon deposits you guys have told me about. i also checked the fuel cut off solenoid and thats all good.

so how do i get rid of those carbon deposits?

and how much are those fuel cut off solenoids to buy, im might just replace it seeing its and old car anyway

answer me this.............. if the car has a fuel cut of solinoid and it is apparently working fine, how does the car run on regardless to tune, carbon deposits or temperature........................... there is no fuel

NO FUEL NO BOOM. very simple equation in my head

I guess it depends on the location of the cut off. There could be petrol vapours to be used up past cut off point. ???

If it never stops, I'd suggest the cut off is faulty, but if it stops eventually, maybe not?

Cars have gremlins )

Decarboning can happen by itself, usually after normal highway driving.
Older donks oil up and carbon up when loaded, ie crawling off road for long periods.

I'm sure there is something that can be put in fuel to decarbon, but my personal opinion is don't bother. Older engines often fail after "cleaning them up"

It may need a tune up, higher octanr fuel, or something, to make it burn cleaner???
Just guessing, I aint no mechanic.


christover

Dont engines run on when the ignition timing is too advanced??

CanberraMav wrote:Dont engines run on when the ignition timing is too advanced??

That can be an issue, yes.

NCpaj wrote:
so how do i get rid of those carbon deposits?

Pull the air cleaner off and while revving the engine pour small amounts of water down the carby.... not so much as to stall or compression lock up the motor, more of a drip feed. Works the same way as water injection and should get rid of any carbon build up.

Hope this helps
Gabe

You don't happen to have an "idle up" solenoid that has become progressively more stuck open? Have you had to progressively wind down the idle speed over the last few months?

The idle stop solenoid usually works only on the idle jet side of the carbie, not on the main side. If you have "leaned out" the idle mixture, and "richened up" the main mixture you could get the fault you describe, and the loss of the idle fuel may make it enough to stumble as described.

yeah i've heard of people using water to clean out the engine but i've never really liked the sounds of it. personally i think your better off using a product recommended for the task which will contain solvents and hydrocarbons to break down all the buildup or varnish and carbon. you do it the same way as with the water, pour it in slowly with the engine running but have your other hand ready to hold the revs up when the engine chokes up a bit. but just be ready for one hell of a smoke show when it comes out the other end!

If yours is a 2.6 like mine was they have an oil gallery on the inlet side of the head very damn close to the inlet ports. My inlet gasket was a bit stuffed and was sucking oil in from the gallery and burning with the fuel and blowing a little smoke which gave the symptoms of worn rings. This oil burning can add to the deposit build up in the chambers.

There's stuff called Sure Burn which we used in an oil fired boiler at work which was drip fed into the oil supply line to the burners and it not only stopped the jets from fouling up it cleaned them as well. I dont know how it would go with decarbonising a petrol cylinder head but decarbonising is what it does anyway.

Thanks for all your help guys.

ill replace the fuel cut off solenoid casue its an old car any way.

and ill also get some decarboning stuff.