Bad consumption

spetz · Post by **spetz** » Mon Mar 07, 2005 2:05 pm

Is the bad fuel economy since you did the timing belt?
Maybe cam timing is wrong now?

wildfaye · Post by **wildfaye** » Mon Mar 07, 2005 2:42 pm

erm, i doubt so, but i'll get dat chked out too...

i got >9 after e timing belt chg too, but it dropped back again...

some pple commented on a possible failed cat, so asking if it may be it...

wildfaye · Post by **wildfaye** » Mon Mar 07, 2005 3:29 pm

ohh...one more thing...

I got this strong exhuast smell all the time...

any ideas?

dannyboyau · Post by **dannyboyau** » Mon Mar 07, 2005 6:08 pm

most probably related to the cat back exhaust and CAI

sounds like it is running rich, first get your air fuel ratio checked on a dyno. if it is running to rich there is a simple fix; you need to fit a adjustable fuel pressure regulator and to get it on a dyno and check your air fuel ratio you can then use the adjustable fuel pressure regulator to adjust your air fuel ratio, or you can buy an aftermarket fuel computer, you will probably have to replace your O2 sensor again.

The FTO O2 sensor is a narrow band sensor, so it can not handle to much differrance in the air fuel ratio or it will pack up and go home.

i am assuming it is running nicely with no missing, also make sure there is no manifold leaks (exhaust or inlet) these could be causing the O2 sensor to get a false reading and then telling the computer to add more fuel. thus causing it to run rich.

wildfaye · Post by **wildfaye** » Mon Mar 07, 2005 7:04 pm

Thanks Danny, now i'll have to find a place to do that dyno thingy...

i'm on stock intake n exhuast, what could have gone wrong to cause a wrong reading?

any other ideas? stock fuel regulator gone home?

this is fretting me out...fuel is getting expensive here...now its S$1.5 per litre for 98 octane, dats like A$1.9!

edit: btw, does anyone know the standard pressure readings of a stock GPX?

dannyboyau · Post by **dannyboyau** » Mon Mar 07, 2005 8:42 pm

wildfaye wrote:Thanks Danny, now i'll have to find a place to do that dyno thingy...

if you know a mechanic with a air fuel ratio meter, he could check it while you drive along the road or get it on the dyno ( rolling road ) ring one of the performance shops in singapore they would know where to go.

wildfaye wrote:i'm on stock intake n exhuast, what could have gone wrong to cause a wrong reading?

sorry i thought some where in the thread it said you had a cat back exhaust and CAI, but still get the air fuel ratio checked.

Recently worked on a toyota ute that had burnt out a valve, completely stock vehicle, fixed the valve and could not find any reason why the valve had burnt out except that it was running 15.1 to 1 air fuel ratio, way too lean. Owner said he was getting poor milage before he burn't out the valve. we put a adjustable fuel pressure regulator on it and adjusted the air fuel ratio on the dyno and after he had driven it he said that it had more power and better fuel economy than when he picked it up from the dealer as a brand new car. and it had done 140 000 kms when it burn't out the valve and had been reguarly serviced by toyota.

most people would think that running it too lean gives more power and better milage. This is not the case. Too lean or too rich you will get poor mileage and less power. most manufacters set there air fuel ratio a little bit rich usually between 11 to 1 and 12 to 1. most tuners will set there mixtures close to 13 to 1. Then as the power comes on have it getting a bit richer going closer to the 12 to 1.

wildfaye wrote:any other ideas? stock fuel regulator gone home?

This could be the case, the best way is to get it checked by an experianced mechanic, find a tuner who has plenty of experiance and ask if they know how to adjust a normal fuel pressure regulator, it is possible to increase the fuel pressure using a hammer and a socket but you need some who knows what they are doing,to do it.

wildfaye wrote:this is fretting me out...fuel is getting expensive here...now its S$1.5 per litre for 98 octane, dats like A$1.9!

move to australia petrol a little bit cheaper here. But hey remember how much you pay for genuine FTO parts compared to us. So i guess it could be worse there.

wildfaye wrote:edit: btw, does anyone know the standard pressure readings of a stock GPX?

which pressure are you refering too? If it is fuel pressure it is normally around 3 bar, would have to read the manual to be certain what it is on the FTO.

First check your car exhuast and inlet for any leaks that the sensors might not be able to adjust for and then get your air fuel ratio checked.

and let use know what the air fuel ratio is

cheers good luck

wildfaye · Post by **wildfaye** » Mon Mar 07, 2005 8:44 pm

I just chked the technical manual, it says the stock fuel pressure regulator is 329kPa, which is approx 47.72psi!

isnt dat a lot of pressure?!

edit: opps!

danny's is a s fast as his 6A13! read the post below his instead!

dannyboyau · Post by **dannyboyau** » Mon Mar 07, 2005 8:52 pm

that sounds about right 3 bar is around 43.5 psi

wildfaye · Post by **wildfaye** » Mon Mar 07, 2005 9:21 pm

Repost on the pressure part

I just chked the technical manual, it says the stock fuel pressure regulator is 329kPa, which is approx 47.72psi! (this is with the vacuum hose disconnected)

(Vacuum hose connected) : avg of 265kPa, approx 38psi.

sounds good?

dannyboyau · Post by **dannyboyau** » Tue Mar 08, 2005 1:20 am

most cars will run around 3 bar as there stock pressure.

Now you have the exact figures you can get them checked, most good mechanics will be able to hook up a pressure gauge and check your fuel pressure.

But make sure you get your air fuel ratio checked

also try and find in the workshop manual what the air fuel ratio should be according to mitsubishi

good luck sorting it out

wildfaye · Post by **wildfaye** » Tue Mar 29, 2005 12:48 am

ran into come bad luck on my trip to msia...

my aircon compressor seize resulting in the aircon pulley not rotating hence a torn power steering/aircon belt...which effectively means no power steering n no aircon! ARGH!

anyway...i am still alive after the saga yesterday n she is in e garage now waiting for a new belt n aircon compressor...

on that note, i hope that my bad consumption is actually due to a not so effective aircon...dat i'll onli know after she come back out...

N...the bloody aircon compressor is such a bitch to find!

stay tuned...

dannyboyau · Post by **dannyboyau** » Tue Mar 29, 2005 2:00 am

i can get you a aircon compressor for 300 AUD + shipping

have you had your air/fuel ratio checked.

wildfaye · Post by **wildfaye** » Fri Apr 01, 2005 1:20 am

got a new compressor fitted...finally...

not had time 2 get my a/f ratio checked...too bogged down with with work...damn...

anyway...e aircon runs fine now...except when started at cold...squeal sounds from...i tink...the compressor pulley/belt...

absolutely fine when warm...hmm...

any ideas...??

dannyboyau · Post by **dannyboyau** » Fri Apr 01, 2005 1:32 am

sounds like the belt is loose