Terrible fuel economy

[carlhako]

Hi Guys

Ive got a series 1 AU with about 284k's showing. ever since ive had it i get around 250ks or less to a tank around town. So far i have replaced the oxygen sensor that made no difference at all. not sure where to go from here. It appears to be running super rich at operating temperature it blows a little bit of black smoke but the engine does not burn any oil. Engine doesnt seem to miss has smooth acceleration altho i think its lacking power but have not driven any other au falcons to compare.

some suggestions on what to check/replace next thanks.

[Casper]

Your MAP sensor is dead, I'll bet money on it. About $150 to replace and all will be back to normal.

[carlhako]

OK ill go test is as per gregorys workshop manual

[JulieA]

I think I'll have to have a look at this also. We recently got an AU XR6 absolutely terrible fuel economy, infact we get better fuel economy from our other car- a blown v8 calais, it just doesn't seem right but this is the first ford we've owned, always had holdens until now.

[The Monty]

One thing that surprised me when my fuel economy went bad, I cleaned the air filter (K&N) and it went back to good.

[carlhako]

Where do you get a tmap sensors from for $150?
Thanks

[Brisbane ghia]

ive heard of people setting the car into diagostics mode--- but i dont know how! Maybe this would show up something

[janek]

map sensor. mine was $109 from ford. My symptoms were as yours, but i was getting better mileage when i gave it a solid run... about 250 granny driving, about 350 hammering it about..

Its a pain in the rectum to change, but well worth it

[INJECTED_250]

ive also seen fuel pressure regs stuck on AU falcons.. get a presure/flow check done 2.. when the reg sticks u get lots of fuel presure which doesnt do fuel econ any favours

[plzhelpmeiamnew]

hey guys is 240km on 20 dollars worth of petrol good?
and at around 5am, is it normal to have alot of smoke blowing out the rear?(noticed it in my side mirror).

[Umineko]

Originally Posted by plzhelpmeiamnew

hey guys is 240km on 20 dollars worth of petrol good?
and at around 5am, is it normal to have alot of smoke blowing out the rear?(noticed it in my side mirror).

Working at a fuel price of $1-20+ for a litre I'd say that's pretty good, and as far as the smoke you'd probably find it's just condensation of the hot exhaust gas with the cold morning air, quite normal and nothing to worry about.

as to the other issue of the thread I'd suggest checking your inlet manifold gasket for leaks also, common problem on the I6 and can cause the fuel consumption to jump

[Soundwarp]

Off my 60ltr tamk driving around town i get about 400km's

[FGII-XR6]

one other possibility is the coolant temp sensor (not the gague sender) if this is cactus it's like it's on choke all the time making it super rich