Fuel Consumption EF!

[infusion]

hey again guys

as many of you may know i bought a EF manual with 110,000kms about 2 weeks ago and since then welded the pedal box and put a stereo in..

next problem is my fuel consumption and idleing.... :evil3:

my car always seems to be running on 5 cylinders when idling.. it seems to be ok when driving but when u stop moving it will continue on 6 cylinders for about 5 secs then drop it down to 5... :( any ideas?

also another thing is my fuel consumption.. when i bought it it had about 1/4 in it and until i filled it up i avgered 12-13 on the trip computer. after filling it up i reset the trip computer.

since then it has been sitting around 20.. ive done about 200kms and im now down to 1/4 tank.. WTF?!?

any ideas guys it would be appreciated..

i hope this problem isnt going to be costly :(

cheers

[eb91xr6]

how hard do you put your foot down is the first question but you may have a head gasket problem, look at your oil and see if its milky,

[infusion]

ive driven it moderatly.. few squirts here and there...

no..oil is not milky..

[DNKPWR]

change or renew spark plugs, leads first...

[infusion]

would i be better off just taking it into ford rather than trying to pin point the problem myself?

[eb91xr6]

give it a full service, like everything,

diff oil
engin oil
oil filter
new airfilter or new K&N or recherge
fuel filter
sparkplugs
leads

put 98 octane in her and it will drive like new if not u got a bigger issue

[DNKPWR]

Does it have a problem with reving out?? if so could be a blocked Cat or exhaust

[infusion]

naa it can red line no problems..

[infusion]

what about the isc, throttle body or oxygen sensors, or thermostat are they common.. or related to my problem?

Edit: i would like to mention..

say im doing 60kms/h and take it out of gear and let it coast the car will idle on 6 cylinders until it come to a stop.. wierd?? :S

[crannersEL]

Had the same problem in my EL, was sitting around the 18-20ltr/100k mark, i changed the following.....

1. spark plugs and leads
2. o2 sensor
3. Temp sensor

Also did a head gasket shortly after, which may have caused a high than normal fuel eco....

Hope that helps :-)

[335JET]

i reckon its your oxygen sensor for your bad fuel economy.

[Gohan]

i get round 12.2km to 100km with some high mileage on the clock thought i dont run my car under 1/4 tank due to the fuel pump is in tank

[VS MANUAL]

i reckon your idle issue would be dirty idle control valve.
In commos it can carbon up and block air getting through causing rough idle.
If your moving, there is a speed sensor that tells the car to idle higher ( i think it allows easier gear changes) and the idle valve is open more. When you stop, the idle drops becaus ethe idle valve closers slightly.
Give it a clean and see.
As i said, it works usually for commodores, i assume ford have the similar set up.

Economy issue. Try the stuff as mentioned in previuos posts.