well the problem is when i pulled up tonight after the drive home from work i turned the ignition off and the engine kept running like it was trying to stall. i was wondering what causes this ? as far as i know the idle solenoid is wired up fine. it doesnt normally do it its only happened maybe 3 times since i fitted the weber about a year ago.

Man i had this exact same problem with my commie lol and the only way i could turn the bastard off is by pulling of the main lead that goes from the coil to the dizzy :bowrofl:

Dont know how i fixed it though. I dont think it would be hard to fix

could be a few things, fuel cut off solenoid stuck open, excessive carbon build up in the engine, over advanced timing.

Run some pulp with a good dose of fuel system cleaner and give her a good rev (dont blow the bugger up ) just give her a bit in first and second. Check your timing and check if the weber is fitted with a fuel cut solenoid and see if its working. :D

Unless it is a diesel then the fuel system is not the problem

the only time over-run has happened to me was when the timming was out, and maybe the wrong plugs that may just need cleaning or replacing with cooler plugs.

bloody anoying though when it happens after a long run

well the timing is set to 5 deg btdc at approx 750-800rpm running on regular unleaded. its running a weber 34adm carby(same as xf falcon).
.70 idle mixture
.65 secondary idle
.135 main jet
.180 secondary jet (i heard it should be approx .145 for optimum performance)

the intake manifold id describe as race ported and polished, maybe it doesnt vaporise fuel that well. the car runs a lot cooler than most magna's because of the bonnet scoop. also the magna is running a set of iridium ix spark plugs suited for the standard engine. also running electronic ignition.

the idle speed is set at about 1100rpm to keep the engine from stalling when i turn the air con on, would this make a difference ?

Having the idle up 2 high can cause an engine to run on. Try lowering it to normal and see if the problem stops. If it does just increase it just enuff to keep her running on a/c. :D

unfortunatly i cant really lower it much because the compressor will make the revs go from 1100-1200rpm down to about 750 and then when you try and pull away from a standing start it is pretty easy to stall it. maybe i should just lower it and turn the compressor off and on and every set of lights :doubt:

Take a plug out and see how it looks,
the idle may be a little fast but if it was ok before then this is a different problem.

...the idle speed is set at about 1100rpm to keep the engine from stalling when i turn the air con on, would this make a difference ?

My engine starting running on with the ignition off after I did this to my magna.

I set my idle speed to about 1000rpm with load, ie: Air con on. After I did this I got the run on problem. I got rid of it by lowering the idle speed to 800rpm with no load on. Turning on the air con will reduce the rpm alittle bit, but not quite enough to stall at lights.

Will your engine still run on if you turn it off in Drive or gear? If it does, its set way too high.

Gday

Sometimes i have the same problem too, it also started after my weber conversion.

But im with Ol'Fart on this one, Im certain its the relationship between fuel delivery and the ignition system.

To my knoledge the webers (im certain about the 32/36s, not so sure about the ADM34's) does not have a fuel cut solenoid whereas the POS mikuni carbies did. The problem lies in the 4G54's ignition and fuel system design, in the quest for more power and economy in the astron II mitsi engineers advanced the ignition timing over what the astron1 had amongst some other minor changes. A consequence in some conditions of advancement is engine run-on, particulary in a hot engine. To prevent run on a fuel cut solenoid is used in the carburettor to cease fuel flow once the ignition has been switched off. In my quests to solve this issue of run-on with the webers i found two simple solutions; either retard your ignition timing (at the sacrifice of power + economy) or run a higher octane fuel. unfortunately there is not much else you can do to stop the engine from "deiseling" :cry:

give it a try... you may find that just adding a notch of octane booster each time you fill up may just do the trick

hope this helps

-Wagon*

Whilst testing the white Magna as a Carby car (stock Mikuni), I used to always have problems of it dieseling.

My solution, whilst extreme, guarentees it won't. EFI conversion.

Check you're dizzys mechanical advance and vacume advance are both working correctly and not stuck in the advance or retard positions.You may have set the timing incorrectly if either of them are not working or stuck in the incorrect position.

well i had the vacum advance working perfectly, but a mechanic disconnected one side of the vacum advance saying that they were fighting against each other and they werent nessacary. i didnt agree but i left it as he had it, so now it doesnt retard at idle :doubt: maybe i should set it how i wanted it, because i swear it idles better.

well i went out and had another look at the operation of the vacum advance and i noticed that the timing was static! at 5 deg btdc even when you rev it, with or without the vacum lines attached to the vacum advance.
the mechanic at the workshop where i got this engine hasnt setup the vacum advance properly or checked it with a timing light to make sure that it was ok, even when i questioned him on why he did it that way.
anyway ive set it up the way its supposed to be from factory so with the vacum advance hooked up at idle its sitting on approx 13 deg BTDC and with it dissconnected drops to 5.

im pretty pissed off cause these guys have cost me a lot of money and everytime they have worked on my car i have had some sort of drama's with them and its cost me more. its not good enough! they are supposed to be experts on mitsubishi's. so looks like ill be getting my car serviced elsewhere untill the warranty period on the engine is over.

im not going to mention the name of the workshop because they are good guys and are part of this club, but i dont have money to waste paying for other peoples mistakes. i can understand why some other people on amc are unimpressed with thier workmanship.


:rant: