OK guys, ive been getting some pretty ****ty fuel economy latley ($50 per week gets me about 250kms) thats around town in a 2.6lt TR Manual (pod and muffler).

now i knew i had a shagged o2 sensor so i replaced that yesterday and things picked up a little, but not as much as i had hoped.

so today i went into my local mitsi dealer (Hutchinson Mitsubishi in Mildura) and got them to check it with the MUT-II (which they didnt charge me for!!) and what we found was the timing was out. (aprox. 30deg BTDC).

Now i know that may sound like alot, but hear me out. The dizzy in the magnas are not only electronic distributors, but they are also electronically controlled which means the ECU adjusts the timing acording to the data that it pick up from all the relevant sensors etc. now the timing SHOULD BE SET TO 5 DEG BTDC. If the distributor isnt set at 5deg the ecu doesnt have the correct base timing to work from and will therefore throw out the whole system. So in my case, the timing was reading aprox 30deg when, at idle, it should be 14deg. Now that suggests that the base timing is set at 10deg.

This can happen 2 ways. You manually set the timing at 10deg OR you have a faulty dizzy that is either feeding out the wrong info to the ecu or is 'sticking' somewhere in the vicinity of 10deg.

i guess what i'm trying to say is that if your dizzy has ever been screwed with, then you need to MAKE SURE it is set to 5deg BTDC in order, not only to get decent fuel economy out of your car, but also to ensure it is running at its peak.


The other thing this is good for is forced induction!

when we add boost to the engine, there needs to be changes in the engine timing. Now considering that the dizzy is electronically controlled, aftermarket EMS can effectivly controll the timing for the particular boost settings you might be running.

anyway, i hope this helps you folks in some way or another.

Cheers

Zach

the other thing to check is the thermostate is working properly .. if it is not or has been taken out the ecu thinks the engine is cold so it opens the injection pulse up to put more fuel in kind of like a choke . also recomend taking the ECT sensor out and buffing the end of it if its dirty ...

whats the ETC sensor?

Whoops Sorry Ect Engine Coolant Temp Not Etc

well ive been running with my corrected timing problem for a few days now and i dont think its changed much. so im wondering if anyone else has any suggestions as to what could be causing me to have such BAD fuel consumption.

where exactly is the ECT sensor coz i think i might give that a bash next.

any suggestions greatly appreciated.


Cheers

Z

Probably a stupid question, but is the POD clean?

Probably a stupid question, but is the POD clean?
i cleaned the pod about 2 weeks ago now, but i changed the pod last weekend to see if it made any difference. i also cleaned the mas sensor when i changed the pod.

Might sound obvious but:
How many kms has the engine done?
Do you have any extra weight in the car?
How hard do you drive it?
When was the last full service done?
When was the last time you replaced fluids/filters (talking every one of them esp. fuel filter).
Have you changed the distributor cap, spark leads/plugs?
Also where is your pod in relation to the MAS?
Maybe the MAS isn't picking up the correct O2 reading?
Also is your O2 sensor working correctly?

I know you have a manual but this is what i found:
I used to get 250km out of about 55litres, then i found out i was driving with OD off, so just switching that on gave me about 350km, then i had a big service and tuned and got 5-550km from 60L and up to 650km from optimax.

Could just need more tuning maybe?

So does anyone know how much a proper Mitsubishi service would be? Mines @ 175K, last logbook service was about 140K I think. Looks like it had the regular logbook services up until this point.
Also any suggestions for cheaper logbook places?

How many kms has the engine done?
201,000 as of yesterday

Do you have any extra weight in the car?
only my toolbox and a drill.

How hard do you drive it?
i dont flog the **** outta is but i dont drive like my grandma

When was the last full service done?
last full service was done when i bought it.

When was the last time you replaced fluids/filters (talking every one of them esp. fuel filter).
air, oil and fuel filter have been changed every 5,000kms since i bought it, i've done about 20,000 kms in it now.

Have you changed the distributor cap, spark leads/plugs?
plugs and leads at 200,000kms, new dizy cap and recoed dizzy at about 190,000kms

Also where is your pod in relation to the MAS?
pod is on a mitsubishi pod adapter directly mounted to the mas housing.

Maybe the MAS isn't picking up the correct O2 reading?
MUT-II tells me that the mas is functioning fine.

Also is your O2 sensor working correctly?
Brand Spanking new one fitted last week.



any other questions... coz im really hating this fuel **** at the moment.

Z

from what ive read on here, you cant put a pod on these magnas, something to do with the air swirling as it gets to the MAS giving it a false reading. But thats just what ive read, im no expert.

My question is what does your temp guage read? and what kinda petrol you putting in it? Does it drive smoothly?

the ecu temp senson is located direcly under the dash temp sensor on the right hand side of the throttle body , on the left hand side of the dizzy on the underside of the water jacket!

i've tried heaps of things, even a Malpasi rising fuel pressure regulator, but to no avail!! i've almost given up on it, although i ran avgas (10 litres avgas / 55 litres optimax) and she ran real well, but still chewed a bit of the juice!! ( 5 spd manual, 2.6 litre, 1600 kg wagon)

from what ive read on here, you cant put a pod on these magnas, something to do with the air swirling as it gets to the MAS giving it a false reading. But thats just what ive read, im no expert.

My question is what does your temp guage read? and what kinda petrol you putting in it? Does it drive smoothly?
as far as the pod is concerned, its an issue thats unyet resolved, from my experience i found no difference between the oval pod thats supposed to be designed to work with the magnas MAS or a round one. the thing that matters is the honeycomb shaped mesh right before the MAS, this matters because of the way the MAS actually works (google "karmen vortex") so as far as air swirling when it gets to the MAS... it has to or the mas doesnt work properly.

as far as fuel is concerned, it runs a bit (only a bit) better on premium and fuel consumption is also a little better when running premium, but is still overall very crappy.

anyone else got any ideas here? or am i gunna start riding my pushie to work?

maybe your putting your foot down too hard :cool:

How does one clean the mas and ummm where is it.... :redface:
Thanx in advance

Just as a reference , my last tank came to 8.8l/100 (usually about 9.5). Anything worse and there is something wrong with the engine. I am running a malpassi set to 42psi but no vacuum, so it tends to lean out slightly , any air/exhaust mods and the engine will lean out especially in the midrange (which generally leads to flatspots and bad fuel consumption..Also new pump (again) and running PULP. The computer is a total ***** , I am hoping to get it Megasquirted soon.