reasons for bad fuel ecconomy??

[PaRaDoX]

hey guys, my cars been getting worse at the fuel finally its hit rock bottom,
average of 19L /100km running BP ultimate 98RON,

so far ive changed the
Injectors and Fuel filter

they helped but not much, i know for a fact the thermostat is rooted and the L/100km goes up when im idling replacing it tommorrow ($14) and ill pick up a spare housing incase i blow it up,

i can also smell a faint smell of petrol vapours as if theres a leak in the inlet manifold, im gonna rip the injectors out and check that they're sealed properly and that might fix something aswel but yeah anyother sensors / misc things that i can use to make her use round 13-14L/100km becuase id be happy with that

 

[mouce]

The Oxygen sensor (top of the passenger side exhaust manifold) can die. And when it does it'll send your fuel figures through the roof.

Worth looking at anyway.

 

[kniever]

geez dude i got a v8 and i get on average 14.5-15L/100km doing city driving ang thats also driving it hard

 

[Hillerus]

When did you last check plugs,leads and air filter? Is it blowing black smoke or anything like that?

 

[PaRaDoX]

ok sorry forgot to mention

o2 sensor was done 3 months ago
plugs done last year
air filter = pod = cleaned last week
leads done december last year

found the reason for the petrol smell, one of the injector seal washers was missing, wasnt holding the seal in, replaced injector and it goes soo much better, idles better yet still runs hot (thermostat)

havnt had a chance to check petrol usage, reset it and i got it up around 25L/100km... lol lets say i was flat foot everywhere (using one of foams tunes of course)

blows no smoke, and dosnt smell funny

 

[mouce]

LOL...depends on which of foamy's tunes you're running, but at least one of them was a complete fuel whore. Try running a stock memcal and see what you get. It might be a tad slower, but that will mean that you can compare the fuel figures to what everyone else is getting.

 

[PaRaDoX]

ran it with stock and got a crazy 22L to 100km

not the memcal, ive got a burner so i change tunes alot, this ones good because untill map 80 theres no more extra fuel or spark really which suits me fine

 

[mouce]

Lucky you with your own burner, I can't wait to get mine. Hopefully sometime after the stereo, suspension and rims/tyres have been sorted LOL.

Something else to think about would be compression...you noticed it running a bit rougher than normal? Could be that you've dropped a cylinder or one of them is considerably weaker than the others. That'll start to drink your fuel.

 

[Immortality]

check your fuel pressure. also, another thing could be a blocked fuel return line which would also show as higher fuel pressure. where does it idle at?

 

[PaRaDoX]

usually 800rpm, how do u check fuel pressure???? (btw compression is @ 150 in all cyclidners)

brought my self a 180deg thermostat today 82deg C
about to fit it when the engine cools down see how it runs then