hey team this is a last resort before i take the beast to the dealer but i think i may have to though.
i have a mivec diamante with the 6g72 DOCH mivec engine in it but at the moment its playing up quite a bit.
The problem,

When you start it up in the morning at cold it starts fine and revs to what you expect @ 1500rpm, then always a few seconds later it all of a sudden will drop a few revs and feel as though its misfireing but it still goes fine, then you put it in gear and it almost stalls and pinks and splutters all over the place and when you take off it seems to run fine but with that definate lag and a rrrrrrrr missfire sound but not bad but the shaking when at stop is bad, as the car warms up it slowly goes away and after ten mintues its completely gone.
the other thing i have heard is not all the time but sometimes i hear in the engine a very tinny sound as if i valve is bouncing or something going click click click extreamly rapidly butr its by far not constand and not always happens.

\Can anyone help me with this the only lead i had was the stepper motor but had it tested and seemed to function properly so im really puzzeled but i need something to fix as the car is just chugging through the fuel

but sometimes i hear in the engine a very tinny sound as if i valve is bouncing or something going click click click extreamly rapidly butr its by far not constand and not always happens.


this could just be a one of the pulley, it happens to my car, Rhino (one of the members as well as a mechanic) has checked it out, nothing for me to worry about, certainly have a look to make sure its just your pulley making the noise

Get the valve clearance\spacing checked. Maybe they've come loose over time.

hey cheers for that i almost feel as though it may be the timing pully as well as when its cold it makes a real bad grounching sound, it wont be the timing belt i dont think had that replaced 20k ago and definately nt the lifters they are sweet.
but cheers ive just bought a 3.5 liter audi so using that at the moment but its bloody gutless compared to the mivec and with it coupled with 5 speed auto its awesome.
cheers

I would be looking at your ISC Motor as you mentioned misfire etc.........when cold and decreasing as the engine gets warmer (sounds like running too rich on start). I'd start with giving your throttle body a good clean (check for carbon build up) and clean the electrical connector to the ISC motor.

P.S: Pour a bottle of Injector clean in your tank as well (bad injector spray pattern) and try and get a good drive out of it ie: country run to give it a clean out. I believe that because of how rich its running its giving off a standard "ping" from the engine.

whats the ISC motor we have cleaned out the throttle body and cleaned out the throttle body and cleared the carbon from the stepper motor and check if it was amping and it was but the conection could be faulty or something

done the injector cleaner ive tried all the convetional things and yes its running very rich alrigh it so stinks out the whole place when cold i mean you cant leave it in the garage and turn it on you will choke it almost smells like its pouring stright petrol though the exaust, and it will in the first ten minutes of driving drop a notch on the fuel gauge which ive estimated to be about 2 liters so its not good is it

ISC = Idle speed control motor, basically the step motor. You really need to check the motor out electrically. They can play up.

yea i think i will do that again we had a look but that sounds like where my nose is pointing thanks for the help mate

I assume rev's decrease as engine gets warm? If not, you may have a problem with your fast idle air valve or vacuum leak in the air inlet system

revs go down with the engine as it warms up so thats right its just this cold start its like something clicks in like the sound of the ac clicking in the engine drops a few revs and changes tone and rouns as rough as guts

The only other thing I can think of that would do this is air inlet temperature sensor (measures the amount of fuel injected into the cylinders). Its located on your intake ducting. There is a procedure for checking sensor. Should be looking at @0.5 Ohms if sensor is serviceable.
The other easiest way to to diagnose is to see if you can sweet talk a Mitsubishi dealer to plug in the diagnostic computer to get up a fault code. Its definately either a sensor / carbon/dirt or electrical. Not Mechanical fault, like valve clearance or timing gear as other previous posts have eluded to.

well its not the stepper motor,
put it on a diognostic just for the engine not the air sensors and two fault codes came up
crank angle sensor
cylinder sensor

have no idea what it means but am going to invewstigate further

cheers

what yr model is the car? early mitsubishi ecu's were total garbage and unreliable, causing all sort of idle, running problems! without hearing and seeing the problem happen, it's gonna be hard to diagnose! is the motor using water/coolant? its not water entering the pot over night causing the cold start misfire? bad headgasket? some things to look out for, goodluck

ok
cheers for that but it could be the ecu as sometimes disconnecting the battery for a while will stop it from doing it.

i got curious last weekend and pulled the whole head apart in the front three cylinders in the v and had a good look at the whole thing i didnt fix or play or adjust anything but after finally putting it backl together which took twice as long the car didnt miss and jerk around and make funny clicking noises in the cam so i thought heck this is awesome. i got 15 cold starts from it till finally today it reverted back to being the original symtoms but it happened gradually, clicking came first them the rough idle which is weird as. it doesnt cause the engine to jerk at all though.

also i am buying a 2002 vrx soon a silver one is a very nice car and just shy of 9 grand with 102000 km so its a steal really


regards

If it only happens when its cold, and once it warms up its fine.

Then for sure its your coolant temp sensor, replace it, I got one for 10 bucks from the wreckers and car drives perfect again.

Just pull it out and test the resistance across the two terminals.

Myne read 2000ohms at room temp. (my broken one didnt read anything)

where is that located

http://www.aussiemagna.com/forums/attachment.php?attachmentid=22796&d=1151114925

The bit circlied in blue.

As you can see in the pic its next to the dizzy, on the passenger underside of the intake manifold.

oh well yea i found it but my car doesnt have a dizzy,
havent tested it as the car is been panel beated had a truck crumple me from the right rear corner. cheers will let u know