Focus 1.6 Duratec Petrol. Fuel Problem?

[bigdaveh]

Hi All

I have a 1.6 petrol focus its a 2005 (newer shape)

i think i have a fuel issue.

it brings up a fault code that's for to lean

i have removed all fuel components under bonnet and cleaned them

i also cleaned the throttle body and map sensor

no change

I did notice that when i dissconected the fuel line from the rail there was no fuel spilt or any pressure

should there be pressure at the rail when car is not running

i suspected the fuel was running back to tank but cant find a return pipe or pressure sensor for fuel system.

i did find a pipe that runs back to the tank which is connected to the inlet manifold.

this leads me to think there should be some vacum in the tank

any ideas

thanks in advance for any advice.

Dave

[mick85]

What is ur issue car not starting

[bigdaveh]

Hi

Sorry

Car starts and runs but when its just been started it will pull away fine then there is a power loss. it doesn't cut out but feels close

it then gradfually returns to normal power and is fine until car is turned off and started again. then same issue.

it also idles a little lumpy.

thanks Dave

[mick85]

Have u changed fuel filter I recommend change that an check fuel pressure should be 3.8 bar

[JW1982]

The Focus MK2/MK2.5 Petrol versions do not have a seperate fuel filter. There is only a strainer located in the fuel tank on the intake of the fuel pump.

[artscot79]

have you checked the plugs leads and coil pack as it sounds like its an issue with them not the fuel system

[bigdaveh]

thanks for advice guys

how can i test fuel pressure as there doesn't seem to be a sensor on the rail

or on the diagnostics

i will double check the plugs etc too

thanks again.

dave

[Mr Singh]

have you got any air leaks on the intake or any air leaks before the oxygen sensor in the cat?

[bigdaveh]

cant find any air leaks

although it does take a gulp when reved

[mick85]

What's exact fault code

[bigdaveh]

hi

it p0171

system too lean bank 1 Permanent

however it does go off for some time but eventually comes back

thanks

[mick85]

Check hoses from pcv valve an all vacuum lines see if u come up with anything could also be lambda sensor what mileage on ur car

[bigdaveh]

its on 81000

it has full ford history

its had a recent full exhaust and cat although these are after market ones

im not sure but i think lambdas are after market too

i cant find any leaking pipes

thanks

Dave

[mick85]

Are u 100% no hoses ripped what condition are filter in if how long ago u replace complete exhaust was it really really cheap replacement

[bigdaveh]

i will double check all hoses tomorrow

its just had new filter

exhaust was already fitted when i got car

it certainly looks really cheap. its not leaking though

thanks again

Dave

[bigdaveh]

Update

still no joy

cant find air leaking anywhere

a few things ive checked are

removed and cleaned all plugs (one was obviously running lean so questioned injector)

swapped the injector for the plug that was lean for one of the others with the hope that the lean pot would move also

i will check this after a good run.

ive also had it on the scanner.

im questioning the fuel pump as it shows at either 0 or 100% nothing in between

when the car is running its constantly at 100% (even while at idle)

im going to check fuel pressure (what should it read both running and at idle)

the long term fuel trim was above 25% so i think thats why mil comes on

any more advice??

thanks

Dave

[bigdaveh]

Im going to test fuel pressure tomorrow

can anyone tell me what it should read

at idle

running

and while engine is not running

Thanks

Dave

[mick85]

Around 3.8 bar if it's way off u know ur problem here

[eliaskok]

check fuel injectors, they might need replacement or clean