liam-rst

iTrader: (1)

was wondering if anyone could help, my 2001 focus 1.6 auto has been a fooker to start from cold and i now have an EML and when plugged into a fault reader its saying 'bank 1 too rich', both the o2 sensors seemed to be reading fine although my ISCV and TPS were having a fit trying to keep it running smooth at idle although fine when revved and held at revs, any ideas?

thanx
liam

liam-rst

iTrader: (1)

bump for the day crew, any ideas anyone?

oldford

Probably running rich, or the oxygen sensor is defective.
Post a scan of all the sensors during idle and when revved.

liam-rst

iTrader: (1)

i would do mate but my mate done it on his hand held diagnostic, anyone know what it means by bank one?

RichieST

iTrader: (2)

bank one means which side of the engine, as it's an inline 4 cylinder it's irrelevant. A V6 for example would have bank 1 and 2, 3 cylinders one side, and 3 the other.

What was the fault code you got?

liam-rst

iTrader: (1)

all the thing said was bank 1 too rich, it was a mac tool diag tool

RichieST

iTrader: (2)

Need the fault code before you can investigate further really, it'll be a P then 4 digits. I would suggest a dodgy pre cat lambda sensor though.

liam-rst

iTrader: (1)

would that make it shit to start though, an surely a diagnostic tool should tell me which sensor is fucked or readin abnormal?

RichieST

iTrader: (2)

a machine that does live data would tell you. Could also be air flow meter problem if it has one. I'd get it on another code reader, get the fault code and go from there.

liam-rst

iTrader: (1)

ok mate thanx for your help, my mate has a snap on one at work so i think ill run it over to him on sat

liam-rst

iTrader: (1)

righ i plugged it back in an the fault code is P0172 then says system too rich, anyone knoe this fault code plus my mate was sayin my MAF readings seemed low they were
3.26g/s at idle
8.39g/s at 2k revs
16.89g/s at 5k revs,
does anyone know if that seems low or about right?

thanx
liam

RichieST

iTrader: (2)

Symptoms

You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.
Causes


A code P0172 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" airfilters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak.
• There could be a fuelpressure or delivery problem

Possible Solutions


Possible solutions include:

• Inspect all vacuum and PCV hoses, replace if necessary Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling. Inspect fuel lines for cracks, leaks, or pinches. Check the fuel pressure at the fuel rail. Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
• Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

Sounds like it could be the air flow meter on its way out then.

RichieST

iTrader: (2)

You could also try unplugging the air flow meter and see if it runs any better. It will go into limp mode but at least the ecu won't be seeing a faulty reading from it.

liam-rst

iTrader: (1)

cheers richie, top man, ill look at gettin a new maf and go from there

gavincw

my car shows p0172 but hasn't a maf sensor any ideas its had both new lambda sensors but still showing

oldford

P0172 - System Too Rich (Bank 1)
There are several reasons possible - like defective sensor (intake air or water temperature, map sensor) or wiring problems with one of these sensors or a leaking hose to the map sensor or fuel pressure too high, just to name a few.
Get the car on a diagnostic machine to check the sensors.

liam-rst

iTrader: (1)

It turned out to be the cat surprisingly, the cars gone now anyway lol