Hey All,

Heaps pissed off atm, i bought a 3 litre TE magna, Manual only like 2 weeks ago, and its been heaps good :D but just today it decided it'd had enough of me thrashing it. :confused:

What heppens is when i accelerate now it splutters and feels like im running at 800 RPM, and not 2000. It does it through the whole rev range, like at 4000 it feels like all of a sudden the engine has problems with fuel or air supply, looses power, and then after a second regains itself up to about 5000, then starts to die again. Does it at any revs, except you tend to notice it more at lower revs.

Im goin to try disonnect the air flow sensor some time tonight or tommorow, and c if that helps, but im doubting it, cause the air flow sensor should only affect power at lower RPMS and not all the way through.

Im considering the fuel pump, but i would have though that would only affect higher rev ranges....?

Im conffused, please help.... :cry:

Thanks

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Greetings All.

Im Not A Mechanic, BUT;
Try Disconnecting The Battery For 30mins. Reset The ECU.

Cheers,
---Tonba
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Could be a number of things. Fuel delivery problem (blocked fuel filter, faulty fuel pump), could be ignition related (faulty, plug/s, lead/s, cap, rotor) could be a faulty sensor. Your best off checkin all the minor things which are easy to check, ei: cap, rotor etc. That way you can start crossing things off the list and eventually found out whats causing the problem. If you arent very mechanically minded and don't really know how to go about doing this, then your best off just taken it to a reputable mechanic or mitsu service centre and get them to diagnose the problem and with any luck fix it up for you.

When was your cars last service? how many k's has it done?

unless it is missing( 1cylinder not firing) i highly doubt it would be n e thing to do with spark ie. spark plugs, lead or disy cap. did your tank have bugger all fuel in it b4 u filled it last time? if so there may have been some crap in the bottom of the tank and either blocked up the fuel filter or the small sock type filter at the bottom of the fuel pump in your tank.

Thanks for the replies,

The car has done 125,000 ks, and not exactly sure when the last service was, i was actually planning on having a full service in the next couple of weeks.

Yeah the bit that confuses me the most is that the problem occured all of a sudden, like it was perfect one moment, then it was like a switch was flicked and all of a sudden :confused:

Ill try reseting the ECU tonight c if that help, not sure if this is total coincidence but when it all went wrong I was at a set of trafic lights just as i recieved a phone call on the mobile, which was sitting in the cup holders, directly above the ECU.......

The tank is about 3/4 full, and i had filled it about about 150 ks ago, so maybee dirt getting into the fuel filter, but not 2 sure.

Does anyone know any good mechanics in SA?

Thanks

hey i had the same problem! the first time it happened i stopped at lights and my automatic actually stalled! then as i was driving i felt through the accelerator the revs had dropped (as i couldnt hear the engine with the radio on) and i looked at the revs and they were at 800, even though i was trying to pump the accelerator for response. then it just kicked back in and pretended nothing ever happened (i was at speed when this happened, not thrashing just cruising). this has happened about 3 times ever, and i think each time i had not warmed up my engine (and during winter). hasnt happened for a while now knock on wood

edit: could you please let me know if you find out what the problem is? by email or whatever, thanks :)

If the revs are jumping around like that, for example, cruising along the freeway sitting at 2000rpm and then it drops to 1600rpm for no reason. I had this problem, where sometimes i'd sit at the lights and the car would stall, brake hard and the car would stall, or sometimes be still and the revs would be at like 2000rpm. I found out it was my stepper motor. I got a new one and all good. If you're getting the same symptoms it may be the same problem.

Just a thought.

Cheers

I went to Mitsubishi yesterday, and the guy there reckons it was something to do with the ignition system. Reckons the car was missfiring under load. So anyway its goin under the knife on Monday and hopefully they will be bale to find the prob. The guy there had a hunch it was some part??? (cant reemeber the damm name :headbange ) and the replacement cost wasnt too much, but the labour would be huge cause they had to pull half the engine appart to get to it :confused:

So hopefully have some good news monday. Yeah and the problem im having only occurs under load. At cruising speed you dont notice a thing, perfect.

Thanks

Grrrrrrr

Just got car back from Mitsubishi, $800 later and still not right. They have replaced spark plugs, and leads, and timing belt, and tuned it all, and it is deffinatley better. But now when u reach about 4500 revs u hit a flat spot in the power, like it cant get any fuel :mad:

So back tommorow, and hopefully they can fix it this time.......

:cry:

tell them to check fuel pressure at the rail (if they havnt already, cos they shoulda) thats the first thing i would be checking

I went to Mitsubishi yesterday, and the guy there reckons it was something to do with the ignition system. Reckons the car was missfiring under load. So anyway its goin under the knife on Monday and hopefully they will be bale to find the prob. The guy there had a hunch it was some part??? (cant reemeber the damm name :headbange ) and the replacement cost wasnt too much, but the labour would be huge cause they had to pull half the engine appart to get to it :confused:

So hopefully have some good news monday. Yeah and the problem im having only occurs under load. At cruising speed you dont notice a thing, perfect.

Thanks

When I put the DOHC in I got a misfiring under load problem a few weeks later, I changed the front engine mount and it disappeared. Very Very bizzare.

I get exactly the same problem in my car whether warm or cold or a full or empty tank. I changed the fuel filter and it made no noticeable difference.. you can basically be mid way through a corner or just driving straight down the road and the tacho will just drop.. the engine will lose all power.. and then it'll just cut in again.. but lately it's been worse and I have no chance but to to pull over and go to neutral.. give it a bit of a rev and then drive off again :( I am finally getting it checked out on Tuesday.. to me it sounds like the fuel pump but I really have no idea. Acceleration is pretty uneven (pulses) though the car still goes hard at WOT.

check your oxy sensor. i had similar problems till i got it replaced.

I get exactly the same problem in my car whether warm or cold or a full or empty tank. I changed the fuel filter and it made no noticeable difference.. you can basically be mid way through a corner or just driving straight down the road and the tacho will just drop.. the engine will lose all power.. and then it'll just cut in again.. but lately it's been worse and I have no chance but to to pull over and go to neutral.. give it a bit of a rev and then drive off again :( I am finally getting it checked out on Tuesday.. to me it sounds like the fuel pump but I really have no idea. Acceleration is pretty uneven (pulses) though the car still goes hard at WOT.
Does this happen when you corner hard to the right? That's probably because your fuels too low and the fuel pump looses access to the fuel duw to the movement of the car while turning hard.

I have this problem redav - rights only. If I plant it from first into a corner, it will lose power up until about 4000 when it kicks back in, then second will have no power until it hits 4000 again - feels like a turbo car- I think it could be the fuel tank as it only happens with low petrol. i hope so anyway - anyone else have this problem?

Ralliart magnas have a specially designed tank to combat this.